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Metastasis Is a Spectrum

News flash:  All metastasis is not alike, and the basic category of “metastatic prostate cancer” is being redefined by doctors and scientists even as we speak.  It’s not just either-or anymore – either cancer is confined to the prostate area, or it has escaped.  It’s actually more of a spectrum, and it is very likely that there’s wiggle room – and still the potential for cure – between cancer escaping the local area around the prostate and full-blown, widespread, metastatic cancer, if we can catch it in time.

I’ve written previously about the work of Johns Hopkins radiation oncologist Phuoc Tran, because I really like what he’s trying to do:  widen the window of curability of prostate cancer.  Great news:  he’s not alone!  Doctors all over the world are rethinking metastasis in prostate cancer and other cancers, as well.  Recently, Tran was one of several experts to take part in a seminar the Prostate Cancer Foundation (PCF) put together.  I was lucky enough to be able to cover it for the PCF, and now I want to make sure you know about the kind of go-getters there are out there who don’t just accept that, if cancer leaves its primary organ, it can’t still be treated and maybe even cured with local treatment.  Better imaging is making it possible to see these cancers sooner than we ever could before.  The reason I want you to know this: if your doctor says you have a couple bits of cancer outside the prostate, so it’s time to start your lifetime of ADT – I want to encourage you to ask around and see if there’s another possibility.

Rethinking Metastasis

For a very long time, many doctors believed, and many still believe, that if we don’t cure cancer while it’s confined to the prostate, then that’s it.  Game over, it’s not curable.  Note:  That doesn’t mean it can’t be treated, sometimes for many years!   But in terms of treatment, traditionally, metastasis has meant bye-bye, local therapy, and hello, systemic therapy – androgen deprivation therapy (ADT), androgen receptor-blocking drugs such as apalutamide or enzalutamide, and chemotherapy.  For patients with metastatic prostate cancer who see their doctors every three months for just a few minutes at a time, that can feel, as one patient’s son put it, like “Lupron and a handshake.”

But a lot of things have come together recently to make doctors and scientists say, “Not so fast!  Maybe there’s a window, and maybe the window is wider than we thought.”  One of these things is the recent ORIOLE study, led by Johns Hopkins radiation oncologist and PCF-funded investigator Phuoc Tran, M.D., Ph.D.  Another is the development over the last decade of better imaging, such as PSMA-PET, which allows tiny bits of cancer to be seen months before they could be seen on conventional imaging, such as a CT scan or bone scan.   Better imaging has sparked an idea:  “If we can see it, we can treat it.”

Is it true?  Can treating little spots of cancer, before full-blown metastasis develops, prolong life?  Recently, the PCF brought together some of the country’s best and brightest – experts in radiation oncology, oncology, urology, and basic science – for a worldwide exchange of knowledge, a webinar attended by more than 300 scientists around the world.  The topic was oligometastasis.  Oligometastasis is just a little bit of metastasis; definitions vary, but generally, scientists who use this word are generally talking about fewer than 3 or 5 spots of cancer that have escaped from the main tumor.  It’s not widespread; it’s limited.  That doesn’t mean it can’t go on to cause trouble later.  If your kids or grandkids are into Pokémon, it’s like catching a little monster before it evolves into something more powerful.

Is oligometastasis treatable?  It is in some other cancers.   In colon cancer, for example, oligometastasis is treated with surgery or spot radiation in addition to removing the primary tumor, and sometimes it’s cured!   Phuoc Tran’s ORIOLE study, and now promising early results from other studies, including ORIOLE’s successor, the RAVENS study, suggest that treating oligometastasis – in Tran’s case, with SABR (stereotactic ablative body radiation, also called SRBT, a highly focused, intense dose of radiation therapy) – in addition to treating the primary prostate tumor can change the course of metastasis in some patients.

Patients reach oligometastasis in different ways.  Some reach it by biochemical recurrence – the dreaded rise of PSA after treatment of the primary tumor in the prostate with surgery or radiation.  Others are diagnosed from the get-go with cancer that has already spread outside the prostate.  The standard of care for most of these latter patients is not only not to treat the main tumor, but not to zap or surgically remove the few sites of metastasis. 

Why not?  Why the heck not?  Or, as Tran says, “It makes so much sense, so why don’t we do it?  Because we have tried periodically over the past five decades to treat metastatic disease aggressively with local therapies, and because of lack of imaging, treatment technology and just general lack of our ability to take care of patients, this approach did not work.”  In fact, he continues, “it was actually a resounding failure, and made many who lived through these periods very scared of doing much more harm than good.  One of the first texts on this concept, called ‘Solitary Metastases,’ actually started out with a chapter called “Illusion or Reality.’”

But that was then.  Even now, there’s not yet definitive proof that it works.  But take heart:  the winds of change are blowing! 

This brings us to the PCF 2020 Global Knowledge Exchange on Oligometastatic Prostate Cancer.  Eric Klein, M.D., Chairman of the Glickman Urological & Kidney Institute at the Cleveland Clinic, who moderated the discussion, set the stage with a story about a patient, seen by him and medical oncologist Howard Scher, M.D., of Memorial Sloan Kettering Cancer Center (MSKCC).  The patient was in his 50s, diagnosed with Gleason 9 cancer that extended slightly past the prostate, into the seminal vesicles.  He also had cancer in a lymph node.  The man received ADT for six months, had a radical prostatectomy, then was on abiraterone plus prednisone for a year afterward.  A bone scan showed one spot of cancer; it was treated with radiation at MSKCC.  “He’s about eight or nine years out now,” says Klein.  “He has an undetectable PSA and a normal testosterone.”

As the PCF’s CEO, Jonathan Simons, M.D., says, “One clinical case well studied can change the course of medical history.”  This patient’s exceptional clinical course has led Klein ask to the big question:  “If we can seemingly cure one man with metastatic prostate cancer, can we cure others?  And are we at a place now in the field to be asking the right questions, with the right trial behind them?”

Ralph Weichselbaum, M.D., Chair of the Department of Radiation and Cellular Oncology at the University of Chicago, is the radiation oncologist who coined the term, “oligometastasis.”  He specializes in treating it in various forms of cancer.  Not only does metastasis represent a spectrum of disease, he says, “depending on the number of metastases, the organs involved, and the pace of progression,” but patients represent a spectrum, too.  “There are subsets of patients who are potentially curable with metastasis-directed therapies” (treating breakout tumors directly, and not relying on systemic therapy alone).  What accounts for these subsets?  Genetic factors, and also the robustness of the patient’s immune system.  Weichselbaum’s research suggests that patients with a well-functioning immune system are better able to hold metastasis in check than others.  In other words, whether oligometastasis responds to treatment depends on “the complex relationship between tumor and host.”

It May Require the Proverbial Kitchen Sink

Scher and Mary-Ellen Taplin, M.D., medical oncologist and Director of Clinical Research at the Dana-Farber Cancer Institute’s Lank Center for Genitourinary Oncology, collaborated on the design of a multi-arm, multi-modality therapy clinical trial with funding from a PCF Challenge Award.  “Our focus is the patient with high-risk localized disease, or low-volume or recurrent metastatic disease,” said Taplin. The trial will be looking at many things, including potential biomarkers for sensitivity and resistance to treatment.  But one of the objectives is of particular interest:  “to eliminate all disease in patients largely incurable with any single treatment.” 

In other words: to kill prostate cancer that has escaped the prostate, these doctors and others believe, in addition to targeting the primary tumor with prostatectomy or radiation, it may well take a short course of ADT, perhaps also chemotherapy, maybe further external-beam radiation to the area around the prostate, and then radiation or radiofrequency ablation to the metastatic sites themselves.   But then, the hope is that these patients will have an undetectable PSA and that they will get their testosterone back.

There are several other important trials underway to treat oligometastasis in prostate cancer.  Of all the things scientists hope to learn from these trials, perhaps most important, says medical oncologist Ana Aparicio, M.D., of MD Anderson Cancer Center, is “how do these site-directed therapies work?”  Will the success come from messing up the circulating tumor microenvironment?  One idea is that, as cancer spreads, it sends messengers back for supplies to the other sites where cancer is already established, using the bloodstream as a liquid version of Fed Ex.  “Or, are we modulating the immune response?  Does the primary tumor have an immunosuppressive effect that limits the ability of the patient’s immune system to control the disease?  Or, are we having an immune-stimulatory effect with treatments?  We may need to build on that, and combine radiation with some novel immunotherapies.  Or, are we decreasing the tumor burden,” by zapping sites of oligometastasis?

Two Icebergs

Aparicio draws a picture for her patients to help explain:  There are two icebergs, one blue, one yellow.  “The blue one, most of it is above the water,” she notes.  “If you get rid of what you see, it is likely that the iceberg is going to take a long time to grow again and become a problem.  So, if what we see on the scans is most of the disease that’s present, then yes, addressing all the sites we can see can be beneficial.  But if it’s just the tip of the iceberg (like the yellow picture), and there’s a large burden of tumor we are not able to detect with our imaging tools, we’ll find that the disease grows very quickly.”

Better imaging, such as PSMA-PET, will undoubtedly help determine the true state of tumor burden, “particularly when the PSA is rising, but it’s less than 10; conventional imaging really is not useful when the PSA is 5 or 10,” says Phuoc Tran.  He believes the number of patients with oligometastasis in the U.S. is huge, “much higher than the number of men diagnosed each year.”  Right now, “systemic therapy is the standard of care for patients with metastatic disease,” says Tran.  “But in that gray area of biochemical recurrence (PSA creeping back up after prostatectomy or radiation of the primary tumor), as men are approaching low-volume metastasis, there’s a perfectly reasonable period in which you can ask the question, does local therapy change the metastatic process?” That was the question behind the ORIOLE trial.

“If the oligometastatic state didn’t exist, if this were not a spectrum, and if local therapy could not alter that natural history of metastasis, then we shouldn’t be able to affect progression at all with local therapy alone.  Patients should progress no matter what.  We did not see that.  Obviously, stronger evidence is needed,” but the results of the ORIOLE trial and early results of the RAVENS trial have been very encouraging.

It may be, says Weichselbaum, that we are dealing with multiple, different disease states, “requiring entirely different kinds of treatments.  We need to define really what metastasis is, and how the systemic treatments and ablative treatments fit together for optimal therapeutic outcome.”

And maybe one day, says Tran, “we can alter the natural history of metastasis, and cure these patients with formerly incurable disease.”

In addition to the book, I have written about this story and much more about prostate cancer on the Prostate Cancer Foundation’s website, pcf.org. The stories I’ve written are under the categories, “Understanding Prostate Cancer,” and “For Patients.”  As Patrick Walsh and I have said for years in our books, Knowledge is power: Saving your life may start with you going to the doctor, and knowing the right questions to ask. I hope all men will put prostate cancer on their radar. Get a baseline PSA blood test in your early 40s, and if you are of African descent, or if cancer and/or prostate cancer runs in your family, you need to be screened regularly for the disease. Many doctors don’t do this, so it’s up to you to ask for it.

 ©Janet Farrar Worthington

 

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Cancer’s Sweet Tooth

Cancer loves sugar, and sugar really loves cancer.  Isn’t that sweet?  Actually, no, it’s more like a match made in hell – because sugar (glucose) makes many types of cancer grow faster.

Scientists have long known that cancers soak up glucose like a sponge; in fact, German physiologist Otto Warburg, who found that tumors extract glucose at a rate 20 to 50 times higher than do normal cells, won the 1931 Nobel Prize for for his research on metabolism.  Lew Cantley told me that.  Cantley, Ph.D., is a world-renowned scientist and Director of the Sandra and Edward Meyer Cancer Center at Weill Cornell Medicine.  I recently interviewed him for the Prostate Cancer Foundation’s website, pcf.org.

Cantley has spent much of his career studying the interplay between sugar and cancer.  His studies suggest that it’s not so much the amount of glucose in your bloodstream that helps promote cancer, as it is the level of insulin, the hormone made by the pancreas that controls glucose.  Insulin helps turn glucose into immediate energy, and also helps your body pack it away for longer-term storage.  Briefly, when you eat, your blood sugar goes up; this causes your pancreas to say, “Hey! We need to make more insulin!”  Insulin, like Paul Revere, then travels rapidly throughout the land, telling the cells to let the glucose in, either to be used right away or saved in muscles, fat cells, and the liver.

Why does a tumor suck up more glucose?  “The main reason,” says Cantley, “is that insulin can turn on the glucose transporters (proteins on cell membranes that carry glucose into cells), similar to those in the liver, muscle and fat.  The presence of those glucose transporters on tumor cells is in part regulated by insulin.  That’s why I keep focusing on the insulin.”

Cantley began studying the insulin receptor in the 1980s, when he was on the faculty at Harvard University.  A few years later, after moving to Tufts University, he discovered an enzyme called phosphoinositide-3-kinase (PI3K); PI3K signals cells that insulin is present; the cells, in turn, open the valve that lets in sugar.  Normally, PI3K does good and vital work, helping cells survive, grow and proliferate.  But sometimes it goes awry; in Type II diabetes, this PI3K pathway becomes sluggish, cells don’t respond appropriately to insulin and become insulin-resistant.  But in cancer, even in someone who’s insulin-resistant, PI3K does its job too well; glucose floods in, tumor cells feast on sugar and grow faster.  “What we now know is that mutations in the PI3K pathway make tumor cells hyperactive in response to insulin.”

In many cancers – sugar-loving cancers; not all cancers are addicted to sugar, but many are – PI3K is like a power switch that drives growth.  “PI3K is the most frequently mutated cancer-promoting gene in humans,” says Cantley.  It may be involved in as many as 80 percent of cancers, including breast cancer, bladder cancer, and certain brain tumors.

What about prostate cancer?  Well, one of the most common genetic events in prostate cancer is the loss of a gene called PTEN; cancer just knocks this gene out.  “PTEN makes an enzyme that reverses what PI3K does.  PI3K makes a lipid, and PTEN destroys that lipid; you have to have a balance between those two enzymes to keep growth under control.  But in prostate cancer, and in breast cancer , the loss of PTEN activates production of this lipid that drives cell growth.

“This tells us we probably should try to keep insulin levels as low as possible if we have cancer, to try to keep the tumor from growing.   If we can keep the diet under control, or exercise to keep glucose levels and insulin levels low, we have a much better chance of slower growth of the tumor.  Our research would also argue that pharmacological intervention would be more effective if we keep insulin levels low.”

Even better:  Keep insulin levels as low as possible anyway, whether you have cancer or not.  “This is a powerful potential cancer-prevention mechanism,” says Howard Soule, Ph.D., Executive Vice President and Chief Science Officer for the PCF.  “Reducing processed sugar may turn out to be even more important for cancer prevention than treatment.”

Can we learn to use cancer’s sweet tooth as a weapon against it?  Cantley’s research has already led to the development of several PI3K-inhibiting drugs: idelalisib, approved by the FDA in 2014 for treatment of lymphoma and leukemia and alpelisib, approved in 2019 for treating breast cancers with mutations in PI3K.  But Cantley also believes that changing the diet – to one low in sugar, but also low in other carbohydrates, which can cause blood sugar to spike – can make cancer-fighting treatments work even better.  In a landmark 2018 paper published in Nature, Cantley and colleagues showed in mice that by severely restricting carbohydrates “and keeping the insulin level low, tumors would respond much more dramatically to drugs that are already approved to treat them.  Tumors we had never been able to shrink in mice, we could shrink with a low-glucose diet.

“That’s my obsession now, to get that message out there.  Endocrinologists tell patients to exercise more and eat less sugar to keep diabetes under control, but for me, it’s even more critical to keep insulin levels low in order to get better outcomes for cancer patients.”  Cantley’s research suggests that “if you have a mutation in the PI3K pathway that causes cancer, and you’re eating a lot of simple carbohydrates, every time your insulin goes up, it’s making the tumor grow.”

How can this knowledge help slow the growth of prostate cancer?  Here’s one example:  “For prostate cancer patients with low Gleason scores who are on active surveillance, it makes perfect sense to pay a lot of attention to what you eat.  Try to keep your consumption of sugary drinks as low as possible.  Keeping sugar down is the best thing you can possibly do.”  It used to be, Cantley notes, Japanese men hardly ever got prostate cancer.  “But second-generation Japanese Americans have prostate cancer in similar rates to Caucasians.  It’s clearly lifestyle,” the Western diet.  “The truth probably is that some Japanese men in their 90s had some level of prostate cancer, but didn’t consume enough sugar for the cancer to advance.”

Here’s another:  If you are on ADT for metastatic prostate cancer, you are more likely to gain weight, and also to develop insulin resistance.  One way to fight this is by limiting your sugar and simple-to-digest carbs.  Bonus: keeping insulin down may also help slow down the cancer.  Watch out for protein drinks, too; many are loaded with sugar.

What about the ketogenic diet?  It’s low in carbs and high in fats.  “I’m not preaching the ketogenic diet; I don’t eat it myself,” says Cantley, who says he weighs the same now as he did in high school.  “I eat what my grandparents ate:  a healthy diet, lots of raw vegetables, some animal fat, healthy vegetable fats, an intermediate amount of protein.  I don’t avoid fats, but I prefer olive oil on salads, and healthy fats from fish and avocado,” instead of loading up on butter and cheese.  “I eat more protein than the ketogenic diet would recommend, and I do occasionally eat rice and pasta.”

But here’s the kicker:  “The one thing I’m fanatic about is not drinking anything with sugar:  no orange juice, no apple juice, no soda.  I’ll eat an orange, but I won’t grind it up and drink it.”  Sugar in liquid form is rapidly digested, which results in “glucose peaks, followed by insulin peaks.”

What about alcohol?  “A dry martini is probably safer than wine; there’s not much sugar in there.”  However, Cantley adds, “I do drink wine, but as low in sugar as possible.”

Exercise is a great way to divert sugar into someplace safe:  the muscles.  “Muscle is where you store a lot of sugar in your body.  If you drink a sugary drink after exercising, your insulin goes up, and you drive all that glucose into your muscle.  Whether you’re exercising at the time you drink a sugary drink, or you just put on muscle from exercise in general, there’s still a benefit: insulin won’t spike.”   However, exercise doesn’t make it safer to drink a lot of sugary drinks, because…

Sugary drinks are bad.  It’s not just sodas; sweet teas and coffee drinks have more sugar than you may realize.  Even sports drinks are loaded with sugar.  In 2019, Cantley and colleagues published another landmark paper in Science, involving mice with polyposis syndrome (mice genetically predisposed to developing polyps in the colon).  They demonstrated that sugary drinks can dramatically drive the growth of intestinal polyps.  “We gave mice high-fructose corn syrup, and their polyps grew two to three times faster.”  Fructose is a different sugar from glucose, and although “fructose is not consumed by tumors, it goes straight to the liver and turns into fat.  Fructose makes you fat.  But the other issue is that intestinal epithelial cells can directly consume fructose.  We think this explains why there has been a doubling to tripling rate of colorectal cancer in young adults.”

Consuming sugar in liquid form is worse than having that same amount of sugar in solid form.  Cantley explains:  “If you eat an apple, it takes a long time to get to the colon.  By the time it gets there, all that sugar has leached out.  But if you have that same amount of sugar in a drink, that watery sugar gets to the colon pretty quickly.  That’s independent of the insulin elevation (discussed above), and it’s another scary reason why young people should avoid drinking sugary drinks, no matter how much you exercise.  You may be a champion marathon runner, but if you’re drinking sugary drinks all the time to keep up your energy, this is a real warning that you should pay attention to.”

Now, back to prostate cancer:  Would taking a PI3K-inhibitor help slow cancer’s growth?  As is often the case with prostate cancer, it’s not that simple.  It turns out that there are two different kinds of PI3K, an alpha and a beta form that can contribute to prostate cancer.  “When prostate cancer loses PTEN, it uses PI3K alpha and beta form redundantly to drive the tumor.”  This means that a drug that targets only the alpha form probably won’t be as effective in prostate cancer as in other forms of cancer, where only the alpha form of PI3K is involved.

However, “our preclinical findings are overwhelmingly supportive, and the retrospective data in patients strongly suggests” that one day, in addition to surgery, radiation, hormonal therapy or other treatments for prostate cancer, patients will be prescribed a precision diet to make the treatment more successful.  “The more we learn about cancer metabolism, we are understanding that cancers are addicted to particular things.  For many cancers, that thing is sugar.”

In addition to the book, I have written much more about prostate cancer on the Prostate Cancer Foundation’s website, pcf.org. The stories I’ve written are under the categories, “Understanding Prostate Cancer,” and “For Patients.”  As Patrick Walsh and I have said for years in our books, Knowledge is power: Saving your life may start with you going to the doctor, and knowing the right questions to ask. I hope all men will put prostate cancer on their radar. Get a baseline PSA blood test in your early 40s, and if you are of African descent, or if cancer and/or prostate cancer runs in your family, you need to be screened regularly for the disease. Many doctors don’t do this, so it’s up to you to ask for it.

©Janet Farrar Worthington

 

 

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Whack-a-Mole and Prostate Cancer

Oligometastasis:  Good News from the ORIOLE Study

To the growing and hopeful list of strategies for attacking prostate cancer, let us add this approach:  Whack-a-Mole.

That’s how Johns Hopkins radiation oncologist Phuoc Tran, M.D., Ph.D., describes it to his patients.  The actual scientific name for this highly sophisticated strategy is stereotactic ablative radiotherapy (SABR, highly focused, intense doses of radiation), for men with oligometastasis – up to three small bits of cancer that have broken away from the main prostate tumor and started to grow elsewhere.

Previously, I wrote on Vital Jake and also on the Prostate Cancer Foundation’s website, about the Baltimore ORIOLE study, led by Tran, who also contributed greatly to our book.  Tran was enrolling patients in a small study to see if men with oligometastasis would benefit from SABR in addition to treatment of their primary tumor.

His strategy was a new one – part of a general rethinking of what represents curable prostate cancer.  The boundary used to be very clear:  prostate cancer was either confined to the prostate or prostate bed, or it wasn’t.   Like a light switch with no dimmer, there was no in-between:  a man with only one metastasis was believed to face the same fate, eventually, as a man with widespread metastases.  It was just a matter of time.

But Tran believed that the lines of prostate cancer were not so clear-cut as scientists had assumed; that instead of two circles – localized and metastatic cancer – that didn’t connect, we might be dealing with a Venn diagram, with oligometastasis as the critical area where the two circles overlap.  “It may be that the window of curability is wider than we thought,” he said last year, and we all hoped that he was right.

Tran and colleagues at Johns Hopkins, Stanford, and Thomas Jefferson University recently published results of the ORIOLE Phase 2 clinical trial in JAMA Oncology.  The results are promising:  54 men with oligometastasis were randomly assigned either to treatment with SABR or to observation.  To detect and keep track of the oligometastases, the study used PSMA-PET scanning, which uses a small molecule linked to PSMA (prostate-specific membrane antigen, found on the surface of prostate cancer cells) as a radioactive tracer.  This PSMA-targeting tracer can highlight areas of cancer as small as a BB – much smaller than can be seen on regular PET or CT imaging.  “PSMA-PET allows us to treat lesions we otherwise couldn’t see,” Tran explains.  “A CT or bone scan would miss those lesions, and patients would presumably not do as well.”

At six months, 61 percent of the men in the observation group progressed – compared to only 19 percent of the men who received SABR.  “We also saw a significantly decreased risk of new metastatic lesions using PSMA PET-CT” says Tran.  “The men in the SABR group did considerably better.  This is a definite signal that we can perhaps modify metastatic disease.”

This was a Phase 2 study, and “we need larger Phase 3 trials,” he says.  “But this is very positive, and we hope that in the future, we will be able to change the course of metastatic disease in some men.” 

Some interesting points here:  First, Tran and colleagues hope that “complete metastatic ablation of oligometastatic prostate cancer may provide an alternative to early initiation of androgen deprivation therapy (ADT).”  The key question, Tran says, is, “can we alter the natural history of metastatic prostate cancer with metastasis-directed therapy (MDT)?”  They don’t know the answer yet.  Most men with oligometastatic disease who get these spots of cancer zapped don’t experience a complete drop in PSA.  This, Tran says, suggests that “residual micrometastases are present but undetectable.” Does SABR simply reset the clock – does it keep pushing the snooze button?  Or, as the scientists hope, does it make the cancer less likely to form new metastases?

Bad Pioneers on a Bad Journey:  Tran and other scientists theorize that the spread of cancer is a story of colonization.  A few pioneers set forth on a journey to a new land.  At first, it’s touch-and-go; their survival is tenuous.  Just think of the early colonists in the U.S., from England, France, or Spain.  Until they took root in the new land, these nascent colonies were frail:  they needed reinforcements from their mother countries – medicine, weapons, tools, food – and “eventually they did survive.”  So it may be with the seeds of cancer; either the cancer cells themselves, or their messages (in the form of genetic and chemical telegrams) are dispatched to the primary tumor, the mother country.  If the mother country is no more – if it has been eradicated by surgery or radiation – then small cancer outposts might get similar support from visiting each other.  But if those outposts are destroyed by SABR, even if there are a few cancer cells remaining in the tissue or bloodstream, it doesn’t matter:  the environment is too hostile, and the numbers are too few for new colonies to survive – “or, if they did, it would take much longer.”

“It’s like Whack-a-Mole”:  In the ORIOLE trial, Tran and colleagues looked for circulating tumor DNA (ctDNA), and identified certain gene signatures that can tell if a man is more likely to respond to SABR.  “Patients who don’t have these mutations responded very well,” he says.  They also have learned from this and other research that men with oligometastasis fall into three basic groups.  “Some men do really well after one course of SABR,” with no recurrence of cancer.  A second group of men have a small recurrence.  “Another site pops up; a microscopic metastasis that we couldn’t see before establishes itself into a macroscopic metastasis.  It’s a limited return of cancer and it responds to another round of SABR.”  Then some men, after a few months, have multiple new areas of cancer.  “For these men, the SABR doesn’t control the disease at all.”

Imagine a green lawn, with one or two dandelions, Tran tells his patients:  “You can pluck those two or three weeds, and wait and see.  Sometimes you get lucky; sometimes another weed or two pops up, and you pluck them.  It’s like Whack-a-Mole.  You can do that for a while,” with repeated SABR treatments.  As the scientists reported:  “If a single round of MDT arrests the progression of some, but not all, lesions, subsequent rounds of MDT might salvage the remaining disease, until what remains is inadequate to support a metastatic phenotype.” Basically, for some men, a treatment strategy might be to keep knocking the cancer down until, like a prizefighter who’s taken one too many blows to the head, it can’t get back up.  Imagine:  punch-drunk prostate cancer that may still be staggering around, but can’t raise a fist.  Wouldn’t that be nice!

That probably won’t work in every man, Tran says.  “Unfortunately, sometimes there will be a whole bunch of seeds all at once, and at that point, you need weed killer all over the lawn,” or systemic therapy.  However, SABR plus ADT, androgen-blocking drugs, or chemo might one day provide “the multipronged attack required to cure this disease.”

Looking ahead:  In a follow-up trial, called RAVENS, men with oligomestatic prostate cancer are randomly given either SABR alone, or SABR plus radium-223 (Xofigo).  “What we have seen in the men in that second group – the ones who have more isolated spots of cancer popping up – is, they’re not recurring where they received the SABR, but in areas that were microscopic, and commonly in the bone.”  Radium-223 targets cancer in bone.  “It releases a radioactive particle that is very toxic but is so focused that it only kills in a radius of two-three cell depths.  It’s ideal for microscopic disease.”

More and larger studies are needed, but in the future, Tran envisions, men with oligometastasis will require more vigilant monitoring, and ideally, regular follow-up PSMA-PET scanning.  “This has the potential to be practice-changing.  We are very excited by our results, and by the potential to modulate the course of metastatic prostate cancer.”

In addition to the book, I have written about this story and much more about prostate cancer on the Prostate Cancer Foundation’s website, pcf.org. The stories I’ve written are under the categories, “Understanding Prostate Cancer,” and “For Patients.”  As Patrick Walsh and I have said for years in our books, Knowledge is power: Saving your life may start with you going to the doctor, and knowing the right questions to ask. I hope all men will put prostate cancer on their radar. Get a baseline PSA blood test in your early 40s, and if you are of African descent, or if cancer and/or prostate cancer runs in your family, you need to be screened regularly for the disease. Many doctors don’t do this, so it’s up to you to ask for it.

 ©Janet Farrar Worthington

 

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Treatment Warriors

They lost each other, and found each other again.  They’re in this for the long haul.  No way is prostate cancer going to change that.

One of the best things about writing for the Prostate Cancer Foundation is the opportunity to meet amazing, unforgettable people.  There are two exceptional people in this story: one is Milton, who is fighting prostate cancer.  The other is Shawni, who is not only his wife:  she will tell you that she is his “battle mate.”  Previously, I said that every patient needs a treatment warrior – an advocate.  Milton has one of the strongest treatment warriors ever.  He is a mighty warrior, too.  I was privileged to interview them both.

Milton and Shawni Wilborn met in high school more than 30 years ago, but they weren’t high school sweethearts – although, they found out later, they both wanted to be.   “She was seeing someone else,” says Milton.  “I’d always try to talk to her; she would just giggle.  She wouldn’t talk to me – just giggle, giggle.  Sophomore year, junior year.  Senior year was the first time I got her in a conversation.  Before I left to go to the Army, I wrote her a letter and told her how much I liked her.”  In the letter, Milton invited her to a party, and said he hoped she would come.

Shawni never got the letter.  “Her dad intercepted the mail.”  Then, one day while she was doing laundry, she found it.  “She cried.  She was so mad because, unbeknownst to me, she really liked me – but was just scared to tell me.”  They each moved on.  But years later, single again, Shawni would tell her daughter, “I met a guy in high school, and who knows, maybe it could have worked out.”

Meanwhile, Milton got married and had two kids, a daughter and son.  “I went to my 10-year reunion.  I’m married,” and when he saw Shawni, “she had this look on her face.  I was like, ‘Oh, wow, you shoulda said something.’”  At the 20-year reunion, Milton was not married any more, but Shawni didn’t come.  However, she heard that he had been there, alone.  They found each other on Facebook.  She was still in their hometown of Pomona, California, and Milton was in Virginia.  They started a long-distance relationship.  “That’s how we rekindled, how we came to be now.”

Shawni moved to Virginia to be with Milton in the Spring of 2015.

Unfortunately, “that’s when my prostate issues started.  Maybe they were already going on, but I didn’t know.”

The first time he noticed something was not right, Milton was at the gym, working out.  “I always worked out, always exercised, always kept myself in shape.”  He did a “boxer’s workout,” with weights, calisthenics, jump rope, and the elliptical.  One day, he thought, “Man, I’m picking up weight!  So I stopped doing the elliptical and started jogging on the treadmill.  Shawni was getting ready to move from California, and I’m hitting the gym extra hard,” to look his best for her.  His left thigh started hurting, and the pain persisted.  He started taking Motrin, although at the time, he thought, “I’m not going to be taking no pills every day!”

The Motrin helped, but the pain from his thigh moved to his hip.  Milton powered through, at the gym and at his two jobs: at the barber shop and at the garage door company he owns.  He did activities with his son, who was in high school, and his daughter, who was in middle school.  The lower left side of his back started hurting, too.  In October 2015, Milton, who is a Mason, went to a Masonic convention in Hampton, Va.  He was feeling sick, so he took some cold medicine.  “The next morning, I couldn’t go to the bathroom.  I couldn’t urinate.  I was in so much pain.”  He went to the VA hospital in Hampton.  “They gave me a catheter.  The doctor comes back and says, ‘You must have taken a lot of cold medicine.  You know, if you have prostate issues, you have to be careful with this medicine.”  But Milton didn’t have prostate issues; he was way too young.

Milton went home and had the catheter removed in Fort Belvoir, Va.  The pain persisted, and he escalated to using a heating pad and taking Motrin.

Soon afterward, he started having trouble with frequent urination – needing to go every five or 10 minutes.  He went back to the hospital, where they checked him for diabetes.  Some of the symptoms sounded like diabetes – frequent urination, weight gain, lower back pain.  “They gave me some medication for the pain, and pills for the urination.”

A few weeks later, the pain in his back was no better.  “It was just killing me.”  At the hospital, they recommended that he try ice instead of heat for the inflammation in his back.  “They gave me a couple ice packs, and sure enough, after a while, the ice took the pain away.  I left there, kept working, then I’d go home and put an ice pack on.”  Shawni was working nights at the time.  “That’s what we did.”  October, November, December.  Milton was getting fed up; the pain wasn’t getting better.

“I told you something was wrong.”

In January, he decided to get a physical.  Monday, January 11, 2016, his 45th birthday, he went to the urology clinic at Fort Belvoir.  The nurse said, “Have you ever had your PSA checked?  You’re an African American male.  You need to know what your PSA is.”  He had his blood drawn.   They told him his labs were normal.

Three days later, on Thursday, they called him back.  “They said my PSA was extremely high, in the 200s, and the pain in my back was due to my prostate.”  He went back to the hospital.   A urologist at the clinic said, “’I’m sorry to tell you, you have prostate cancer.  There’s nothing more we can do for you here.  Do you have any questions?’”

Oh yes, Milton had questions.  “Last week, they said everything was fine.  This week they’re telling me I’ve got cancer.  No way!  Bull crap!”  Shawni was crying.  “I said, ‘I told you a long time ago, something was wrong!’”  The urologist said, “‘I’m so sorry, there’s nothing more we can do.’  I was cursing, being upset.”  The urologist told Milton that he could have his testicles surgically removed to stop him from producing testosterone.  “There’s nothing more we can do for you here.  Go to oncology.  Maybe they can do something for you.  I’m so sorry.”

“That was it,” Milton says.  “Not sympathy, and no compassion.  Just ‘we can’t do anything else for you.’”  He went to oncology.  “Sign in, wait, get triaged, take vital signs. The pain’s a 10, kidney pain, back pain.  The doctor comes in and says, ‘Your prostate cancer has already spread outside the prostate.  We can’t cure it.  However, we can get control over it by giving you hormonal therapy.  We can give you a shot in the stomach, every three months.  That will help stop you from producing testosterone.”  They gave him some steroids for 14 days, and told him to come back after that to start chemotherapy, with taxotere.  “So that’s what we did.”  They gave him morphine for the pain.

In the two weeks since his first PSA test, his PSA had more than doubled, to 548.

“We prayed, and cried.  I called my mom.  My dad wasn’t doing well, and my mom was taking care of him.” Shawni called her parents.  They told their four kids, who took the news hard.  “Our two oldest girls are living in Texas, our son had just graduated high school and was set to go off in the military.  Our youngest daughter was getting ready to be a freshman in high school.  It was a really tough time.”  Milton started chemo, and he kept on working.  He had a Picc line placed in his bicep, so he wouldn’t damage his veins from the chemo.

The chemo made him sick.  It lowered his white blood cell count, made him throw up.  He lost his hair – on his head, his body, his eyebrows.  But he stayed focused on getting better.

“Cancer is by no means going to tear us down.” 

Milton talked to his pastor, and they prayed for him to stay strong.  He also focused on gratitude.  “You come across people who are just taking their life for granted, complaining about some of the craziest things.  You just don’t know.  You don’t know how blessed you are.”

He and Shawni got married in 2017.  “She took care of me.  She’s been by my side the entire way.  She’s been my angel, my nurse, my caregiver, by my side for it all.  She’s everything to me.

“I always try to let her know nothing can stop us.  We can’t let lack of communication or something else bother us, because we’re bigger than that.  We’ve been through tougher days and back.  We just push on.  We fight.  We fight and fight and fight.  Cancer is by no means going to tear us down.” 

Shawni could have bailed out, Milton says.  But she didn’t, and she wouldn’t.  “I wouldn’t fault her for it,” says Milton.  “I’ve caught her crying.  I say, ‘What’s wrong?’ ‘Oh, nothing.’  ‘Yeah, right.’”

Sometimes, he says, life just gives you a journey and a path to walk on.  “This is my journey.  This is my path.  We’re going to keep on walking it, keep on fighting.

It’ll be all right.”

They both like Steven Krasnow, M.D., Milton’s oncologist at the Washington, D.C., VA Medical Center, very much.  “He’s just been awesome.  I’ve got the best doctor in the hospital looking after me.  The nurses who take care of me, they’re awesome.  They care.”

Milton and Shawni try to give back, to help other cancer patients they see at the VA.  “I’m 48,” says Milton.  “I don’t look 48; I look probably 40.  Shawni’s 47, and she looks 30-something.  We look pretty good for our age.  People are always surprised to see us in oncology.”  Shawni says, “People will ask, ‘Oh, are you here with your grandfather?’ I say I’m here with my husband.”

“Treat him as if he’s going to live forever.”

Shawni and Milton didn’t know about the levels of prostate cancer until the physician’s assistant (PA) happened to close the door in the office, and they saw a poster of prostate cancer and all its stages.  “We were both looking at it, reading what each stage is,” says Shawni.  When the PA came back in, they asked about Milton.  “’He’s stage 4.’  It was like the air got knocked out of us.  People hear stage 4, and automatically think that person is terminal.

“From that point, we told Dr. Krasnow, we don’t want to know the time frame.  We just want you to treat him as if he’s going to live forever.  How long does he have?  He has forever.  Once people start hearing the diagnosis, it’s like they start living by a calendar.  Life slowly starts to deteriorate.  We never discuss that with anyone.  They all know not to talk about time frames with us.  We’ve seen people come and go in the office.  He’ll talk to the cancer patients when they’re in chemo.  I give the caregivers my story.  We try to be positive, to be uplifting as much as we can.”

Says Milton:  “God put me in a position to be able to tell my story.”  He is determined to remain thankful.  “I have a song that I play, when my alarm for medication goes off.  It’s the Clark Sisters, ‘I’m Looking for a Miracle.’”  The lyrics include these words:  “I expect the impossible.  I feel the intangible and I see the invisible.  The sky is the limit.”

“She wiped my tears away.”

Says Milton:  “That song is just so beautiful to me.  It gives me a reason to keep pushing.”  It’s on his playlist, on repeat, when he’s getting the chemo.  “A year ago, I did a 5K walk and run down in Virginia Beach for Prostate Cancer awareness.  I was hurting.  I put that song on.”  His son and Shawni were on the sidelines, cheering him on.  “I just kept on pushing to the finish line.  One hour, 14 minutes.”

In September 2019, Milton was in the hospital for back pain.  It was Sunday.  He was on his iPad, getting ready for the live-stream service of his church in Dumfries, Virginia – his “bedside Baptist,” he jokes.  “I just heard this crunch, just from the base of my neck up into my head.  I’m just holding my neck, like you’re doing sit-ups.”  He wrapped a rolled-up towel around his neck, “made my own neck brace.”  A CT scan later revealed a fractured C2 vertebrae.  “The cancer is in my neck, back, shoulders, hips, thighs, and my ribs.”

Milton says he got mad.  This happened while he was just sitting there!  “I didn’t question God, anything like that.  I was just mad.”  Shawni was crying, but she told him, “It’s going to be okay.  She saved her tears for later, and she wiped my tears away.  For four years, we’ve been fighting this.”

Milton hopes to take part in a clinical trial.  He went through a painful bone marrow biopsy to be eligible for a radionuclide trial, but “they only needed 800 people,” and 1,000 applied.  Milton didn’t get in.   He is being treated with radium-223, which treats the cancer in his bones.  “Everywhere the cancer is or has been, it causes so much pain.  But I can’t complain too much.  I keep pushing through.”

Their faith – in God, and in each other – keeps them going.  “It’s crazy to say this,” says Milton, “but for things to be so bad, it also turned out to be so good, because there are so many things that I guess people take for granted.  So many things I’ve learned about myself, so many things I’ve learned about my faith in God.”  He refers to the parable of the mustard seed in the Bible.   “A mustard seed is pretty small, not much bigger than a grain of salt.  Just believe this much, God is saying.

“We stop and remind ourselves where we’re at, and what we’ve been through,” how glad they are that they found each other again.  “Sometimes we forget how lucky we are, and we remind each other how blessed we are, how grateful we are that God has given us this challenge.  He says all you’ve got to do is just believe.  Live right.  Treat people right.  I just need you to take care of these things right here, and I’ll take care of the rest.  Everything’s going to be okay.  We just keep pushing.”

Note: Less than a year after I wrote this story, Milton entered hospice care.  Shawni said at the time, “I feel like my heart is slowly being torn to pieces.”  A few weeks later, he died of prostate cancer, and those of us at PCF who had been fortunate enough to get to know them, and who had been praying for them and trying so hard to find a clinical trial or something that might help Milton felt torn to pieces, too.

In addition to the book, I have written about this story and much more about prostate cancer on the Prostate Cancer Foundation’s website, pcf.org. The stories I’ve written are under the categories, “Understanding Prostate Cancer,” and “For Patients.”  As Patrick Walsh and I have said for years in our books, Knowledge is power: Saving your life may start with you going to the doctor, and knowing the right questions to ask. I hope all men will put prostate cancer on their radar. Get a baseline PSA blood test in your early 40s, and if you are of African descent, or if cancer and/or prostate cancer runs in your family, you need to be screened regularly for the disease. Many doctors don’t do this, so it’s up to you to ask for it.

©Janet Farrar Worthington

 

 

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One Man’s Prostate Cancer Journey

In 2013, Allan Odden was 70, newly retired from a career as a college professor, in good health, walking four miles a day, playing golf and bridge, and ready to enjoy many more years with his wife, Eleanor.  When he went for his yearly physical, his doctor asked if he wanted a PSA test to check for prostate cancer.  He had last had one in 2011, and it was low: 1.4 ng/ml.

Allan wondered why his doctor asked him if he wanted the test.  He recalls:  “The doctor said, “Well, if it is rising, I’m not sure what I’d tell you, as there is no really good result from treatment; everyone pretty much gets some level of incontinence and impotence if they need treatment for prostate cancer,” a generalization with which many urologists and radiation oncologists (particularly those at high-volume centers who have expertise in treating men with prostate cancer) would disagree.  “The medical recommendation these days is that men 70 or older do not need to get their PSA; if they have prostate cancer, which most men do by the time they die, it is usually very slow-growing, so most men outlive it.  And there are too many false positives from the PSA test.  Too many men see a rising PSA, get the prostate surgically removed or (ir)radiated, and have some degree of incontinence and impotence when they really didn’t have a cancer that would grow and, thus, needed to be treated.”

Let’s hold up here for a minute.

This is not good advice.  First, many men completely recover urinary continence and, with help from pills such as Viagra or from other forms of treatment, deal successfully with erectile dysfunction (ED), if one or both of the nerve bundles that are responsible for erection are left intact.  (Note:  If you have had surgery for prostate cancer and have lingering incontinence or trouble with ED, don’t despair.  There is help available.  Talk to your urologist.  As we say in the book, where there’s a will, there’s a way.)

Second, this sentence: “And the medical recommendation these days is that men 70 or older do not need to get their PSA; if they have prostate cancer, which most men do by the time they die, it is usually very slow-growing, so most men outlive it.”  WRONG.  Most men don’t have prostate cancer by the time they die, although most men do have prostate trouble – benign prostatic enlargement (BPH).  In fact; 50 percent of men age 50 have it, 60 percent of men age 60 have it, 70 percent of men age 70 have it, and 80 percent of men age 80 have it.  But that’s not prostate cancer.  Sheesh!

However:  As Johns Hopkins physicians recently found looking at population studies, men diagnosed at age 75 or older account for 48 percent of metastatic cancers and 53 percent of prostate cancer deaths, despite representing only 26 percent of the overall population.  I have discussed this study and screening for older men here.

And finally, yes, the part about the PSA test was true – in the 1990s.  Now there are “second-tier” PSA tests to help tell whether an elevated or rising PSA is more likely to be coming from cancer or BPH.  One is the free PSA test; another is called the Prostate Health Index (PHI) test.  There are more; I will cover these in a new post.  These new tests, along with prostate MRI, have helped weed out which men really need a prostate biopsy, and which men who have cancer actually need treatment.  For many men diagnosed with Gleason 6 prostate cancer, active (vigilant) surveillance is a good option.

Fortunately, Allan didn’t turn down the test.  His PSA had gone up to 2.53.  The next PSA, a few months later, was 4.29.  The next one, in 2015, was 5.04.  But he was told not to “rush to judgment.”  To wait and see.  By the fall of 2017, his PSA had risen above 7.  “My internist said it was now time for me to see the urologist.”  Finally, he got the free PSA test – and his free PSA was very low.  Then he had an MRI, which showed three possible lesions that could be cancer; some of these spots had Gleason 3 + 3 cancer, and a couple had Gleason 3 + 4 cancer.  The doctor strongly recommended treatment sooner rather than later – either surgical removal or radiation.  Allan chose surgery.  The surgery went well, although the surgeon told him that his cancer had grown a bit and the prostate sac had “bulged” a bit – but the lymph nodes were cancer-free.  Incontinence afterward was a challenge, but Allan did Kegels and other exercises and regained bladder control.

A month after the surgery, his PSA, which was supposed to be undetectable, was 0.12, and the pathology report had found that “microscopic amounts of cancer, not visible to the naked eye, had escaped the prostate sac around the area of the bulge.”  The PSA, though low, had doubled by December.  Allan made an appointment to see a radiation oncologist, who (after a bone scan and MRIs of his abdomen and pelvis showed no cancer) recommended a short course of hormonal therapy (ADT) as well as eight weeks of radiation.

The radiation treatment itself, Allan found, was “a piece of cake.”  Five minutes a day, for 39 days.  However, getting ready for that five minutes each day proved more challenging.

“Low Residue” Diet

A nurse educator told Allan that he needed to go on a “low residue” diet.   Allan, who has written a book about his prostate cancer journey, is funny, analytical, and heartfelt.  He relates this conversation:  “She said that means a diet with very little fiber, as the goal for the radiation was to have as clear a colon as possible.  And then I said that I’ve been told for years to eat lots of fiber, in order to be regular, which would then clear my bowel so it would be perfect for the radiation treatment.  But not perfect enough, she insisted.  She continued by saying you should eat very little fiber, no bran flakes, no oatmeal, no raw vegetables, no whole grain bread or crackers, no prunes or prune juice, no fruit with skin or seeds, etc.”  No eating, pretty much, any of my actual diet!

What could he eat?  White bread, white rice, white pasta, mashed white potatoes, super-cooked vegetables with the skins removed, no beans or peas, “as they cause gas and would inflate the colon, pushing it near the prostate area,” clear juice, canned fruit and veggies, etc.  “I looked at her like she was crazy, and she said, ‘I’m not your cardiologist, and this is just for eight weeks of radiation.’”  Allan worried about constipation from a diet that would produce “Elmer’s Glue in my gut,” and “she said that over time, it wouldn’t do that and would make me regular.  She said I just needed to trust her…  And then she said, ‘Oh, there is one more thing.  While we want an empty colon, we also want a full bladder.  And this is what you need to do: empty your bladder 60 minutes before your radiation appointment and then drink 24-32 ounces of fluid so when you get here, you’ll have a full bladder.’”

Not what a man who has just relearned how to control his urinary sphincter wants to hear.  But Allan managed it.  Armed with literature from the nurse showing the fiber content of various foods, “I found canned soups with zero fiber.  I found crackers, even tasty crackers, with zero fiber or less than 1 fiber in a four-cracker serving.  English muffins, made with processed white flour, have very little fiber.  Most fruits have a lot of fiber, but honeydew melon does not, so I bought one.  I bought Rice Crispies instead of Bran Buds and Rice Chex instead of Shredded Wheat.  I decided to have lots of fish, as that is easy to digest (and I needed a successful bowel movement every day before 9:30, as my radiation appointment was for 10:30).  Eggs are low in fiber.

“Weird though it was, the diet actually worked.  I did stay regular, the solid waste was much less, the stools were smaller though more difficult to exit the body.  The nurse was right.”

Arriving with a full bladder made for some white-knuckle rides on the express bus to the hospital, but he managed that, too.   “I was a very fortunate man to have had very few side effects,” he says.  During the course of his treatment, “I also continued my other activities – bridge two days a week, dance lessons two days a week, and golf on Tuesday morning.  And now my chances of success were well over 95 percent and my PSA was already reading zero.”

On the last day of his treatment, Allan rang the gong in the radiation center – a celebration ritual – and posed for pictures with some of the staff he had come to know over the last two months.  He is now ready, he says, “to enjoy every minute of the rest of my life.”

In addition to the book, I have written about this story and much more about prostate cancer on the Prostate Cancer Foundation’s website, pcf.org. The stories I’ve written are under the categories, “Understanding Prostate Cancer,” and “For Patients.”  As Patrick Walsh and I have said for years in our books, Knowledge is power: Saving your life may start with you going to the doctor, and knowing the right questions to ask. I hope all men will put prostate cancer on their radar. Get a baseline PSA blood test in your early 40s, and if you are of African descent, or if cancer and/or prostate cancer runs in your family, you need to be screened regularly for the disease. You should start at age 40.  Many doctors don’t do this, so it’s up to you to ask for it.

©Janet Farrar Worthington

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Do Older Men Still Need a PSA Test?

I’m in my seventies.  My doctor said I don’t need any more PSA tests because I’m too old to worry about it.  Is that right? 

It depends on you and your PSA history.  There are some troubling statistics, which I will get to in a minute.  But first the good news:  If you are in your 70s, and your PSA is very low (how low? see below) and has been for years, you are probably unlikely to develop lethal prostate cancer.  H. Ballentine Carter, M.D., the Johns Hopkins urologist who dedicated his career to studying PSA and who came up with the concept of PSA velocity, asked this question using data from the Baltimore Longitudinal Study of Aging (BLSA):

Is your PSA track record good?  Basically, Carter looked at decades of blood samples from the same group of men, and saw which men developed prostate cancer, low-risk and high-risk, who died of prostate cancer, and who never developed it at all.  He also had been studying medical literature on other types of cancer.  In a recent interview for Discovery, the magazine for the Brady Urological Institute at Johns Hopkins, he told me:  “It just dawned on me, mainly from cervical cancer screening literature:  What if very young men have PSA levels that are extremely low, and have cumulative numbers of negative tests.  Would that suggest later in life that they are very low-risk?  As it turns out, if you’re in your 50s or early 60s and you have very low PSA, it’s unlikely that you’re going to be diagnosed with prostate cancer later in life.”  (Note: He’s NOT saying, “Stop getting screened in your 50s or early 60s!”) “Is there an age and a PSA level where you could tell an older man, ‘Congratulations, you made it, you don’t ever need to have a PSA test again?”  Sure enough, you reach an age around 75, and your PSA is less than 3, it is extremely unlikely that you will be diagnosed with lethal prostate cancer.” 

In our book, we say:  “If your PSA track record is good, you can probably retire earlier from PSA screening.”  So what does this mean?  Carter showed that if PSA testing were discontinued at age 65 in men who had PSA levels below 0.5 to 1.0 ng/ml, it would be unlikely that prostate cancer would be missed later in life.  In another study, Carter and colleagues found that it is safe to discontinue PSA testing for 75- to 80-year-old men with PSA levels lower than 3; none of the men in that study later died from prostate cancer.  However, the 75- to 80-year-old men who had PSA levels greater than 3 remained at risk of developing life-threatening disease.

Now, here’s the troubling point, which we discuss in our book:  Population studies have shown that men diagnosed at age 75 or older account for 48 percent of metastatic cancers and 53 percent of prostate cancer deaths, despite representing only 26 percent of the overall population.

How can this be? Another Johns Hopkins study, led by my co-author, urologist Patrick Walsh, M.D., and radiation oncologist Phuoc Tran, M.D., may shed some light here.  The Hopkins scientists studied 274 men over age 75 who underwent radiation therapy for prostate cancer. “We found that men who underwent PSA testing (as in, men who got regular screening for prostate cancer) were significantly less likely to be diagnosed with high-risk prostate cancer, and that men with either no PSA testing or incomplete testing (either a change in PSA was not followed up, or a biopsy was not performed when it was indicated); had more than a three-fold higher risk of having high-risk disease at diagnosis, when adjusted for other clinical risk factors,” says Tran.  They also found that “many of these men (who had not been screened, or who had gotten incomplete screening) who had a low PSA were found to have cancers that could be felt on a rectal exam” — indicating, Walsh says, that “older men need both a PSA and a digital rectal examination.”  Although this was a small study and more research is needed, “we believe that PSA screening should be considered in very healthy older men.”  

So:  Are you otherwise very healthy, and could expect to live a good, long life? It’s probably a good idea to keep getting checked for prostate cancer.

What’s the difference in the men who had been getting regular screening?  Their cancer was most likely caught much sooner after their PSA started to go up.

Screening saves lives.  Here’s an example from another specialty:  My husband, Mark, is a gastroenterologist, and he knows, when he does a routine colonoscopy on someone – let’s say a 65-year-old man – who got a screening colonoscopy at age 50 (or 40 or younger, if that person is high-risk), and who had a follow-up colonoscopy when recommended, that he is much less likely to find bad cancer in that guy.  But say a man of that same age comes in for the first time to get a colonoscopy, maybe because of some blood in the stool.  Say that guy’s mother had colon cancer.  That man should have gotten checked out for the first time 25 years ago.  I’m not sure what his record is, but over the years, Mark has had to remove an awful lot of polyps – once, I remember, it was 40! – from people who didn’t get screened when they could have.  Worse, he has found cancer that has gone through the wall of the colon, cancer that needs surgery to remove part of the intestine, cancer that needs chemo, cancer that very likely would never have had the chance to develop if caught early.

Don’t be that guy.  Please.

In addition to the book, I have written about this story and much more about prostate cancer on the Prostate Cancer Foundation’s website, pcf.org. The stories I’ve written are under the categories, “Understanding Prostate Cancer,” and “For Patients.”  As Patrick Walsh and I have said for years in our books, Knowledge is power: Saving your life may start with you going to the doctor, and knowing the right questions to ask. I hope all men will put prostate cancer on their radar. Get a baseline PSA blood test in your early 40s, and if you are of African descent, or if cancer and/or prostate cancer runs in your family, you need to be screened regularly for the disease. You should start at age 40.  Many doctors don’t do this, so it’s up to you to ask for it.

©Janet Farrar Worthington

 

 

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PSA Velocity:  It’s Not the Number, but What It Does!

Why did I say that no PSA number above 1, by itself, is a guarantee that you don’t have cancer?  Why do we say this in our book?

Because that’s what H. Ballentine (Bal) Carter, M.D., the great Johns Hopkins urologist and scientist, discovered.  In fact, he says:  “There is no PSA value below which you can guarantee someone they don’t have prostate cancer,” and no value that automatically means it’s cancer.  “There are men with PSAs of 20 who don’t have prostate cancer, and men with 0.5 to 1 who can have very serious prostate cancer.”

So, basically:  Your PSA number, by itself, means Jack.  What happens to it over time means everything.

This is called PSA velocity.  It is a concept pioneered in the 1990s by Carter, working with Patrick Walsh, M.D., my co-author on many books and publications, and it’s a very effective way to detect prostate cancer.  I recently interviewed Carter, who retired this summer after 32 years at The Brady Urological Institute at Johns Hopkins, for Discovery, a magazine published by the Brady.  He devoted his career to making sense of PSA, and what he has accomplished is incredible.  Among many findings, Carter also came up with median PSA numbers based on age, which we will discuss in a minute.

It’s a shame that many doctors, including even some urologists, don’t seem to grasp these simple and very effective ideas, and instead focus on the PSA number itself – an idea that was outdated 20 years ago.

I say this because I don’t know how many times I have talked to men who say:

“My doctor says I don’t need to worry about screening for prostate cancer until I’m in my 50s, and even then, it’s not really that big a deal.”

And, “My doctor says my PSA number is low, so everything’s fine, I don’t need to worry about it.”

This makes me very frustrated.  I’ve written about the travesty that happened in prostate cancer screening here, so we won’t go into that now.

Let’s get back to Bal Carter and PSA, and let’s time-travel, very briefly, to the late 1980s, when widespread screening for prostate cancer did not exist.  The discovery of PSA (prostate-specific antigen, an enzyme made by the prostate) had just made it possible, for the first time, to learn about prostate cancer from a blood test – but nobody knew what to do with PSA, or how to use it along with the rectal exam and the new use of transrectal ultrasound-guided biopsy in diagnosing prostate cancer early.

“There was controversy about even using PSA,” Carter recalls.   “There were voices saying, ‘Beware, we’re going to uncover a lot of cancers that never should have come to light.’”  And that was true.  So then came controversy over the PSA threshold:  what was the magic number that would indicate the need for a prostate biopsy?  “In retrospect, that was probably the wrong thing to be asking,” Carter says.  “There was just not a good understanding then of PSA as a continuum.”

Carter pioneered the concept of PSA velocity – the rate at which PSA rises over time.  “But that’s never been tested as a screening tool.  I honestly believe if we had not focused on a single, absolute threshold, and instead had focused on changes in PSA to alert us that someone has an aggressive cancer, in the long run we may have identified more individuals with the cancers that need to be treated, and eliminated more who don’t need to be treated.  But that will require a carefully done, prospective trial.”

Carter started looking at this years ago, in studies that would lay the foundation for PSA screening and also for safe, vigilant active surveillance as a mainstream treatment for low-risk prostate cancer.  How that came about, he says, “was really the brilliance of Pat Walsh.  When I first joined the faculty, he came to me and said, ‘What do you think would happen if we looked at changes in PSA?’  I said, ‘I think they’ll probably rise faster in people who have prostate cancer.  How can we study that?’  And he said, ‘Have you ever heard of the Baltimore Longitudinal Study of Aging (BLSA)?’”  The BLSA was conceived in 1958, when gerontologists at the Baltimore City Hospitals were trying to find a better way to study aging.  At that time, and even today, scientists would compare men and women who were in their twenties to people who were decades older.  But these scientists had a better idea:  to revisit the same person every two years, with a history and physical and blood samples that were stored.  This made it possible to look at men who had prostate disease, benign enlargement, or localized or metastatic prostate cancer – and then work backward, describing the changes in PSA, over the previous 20 to 30 years.

“I had never heard of it,” Carter continues.  “He said, ‘I know they have a large frozen serum bank, and we might be able to use some of that to look at the question: do PSA levels rise faster in men who have aggressive disease vs. men who don’t have prostate cancer?’  Sure enough, that’s the way it turned out.”

Carter’s work, Walsh says, “has changed the way prostate cancer is treated today around the world.”  Although Carter is a fine surgeon, “he has done his best not to operate on men who don’t need it.  He was a voice of reason at a time when the diagnosis and treatment of the disease underwent revolutionary changes.  With the introduction of widespread PSA testing in 1990, the diagnosis of prostate cancer reached epidemic acceleration and led to abuses fed by the greed of many fellow urologists.  Those are tough words, but there is no other way to explain it.  Bal emphasized the harm of overdiagnosis and overtreatment, proposed solutions based on improved screening practices, and developed guidelines for identifying men who should not be treated.  He began by learning about PSA.”

Using blood samples that had been collected for decades by the BLSA, Carter described how age and prostate disease influenced PSA.  “Based on his unique observations, he proposed new ways to interpret PSA levels, and specified intervals for testing that were the most informative,” says Walsh.  As Chairman of the AUA’s Guidelines Panel, Carter developed recommendations for how all urologists should screen for prostate cancer.

A Prostate Barometer

We discuss PSA in detail in chapter 4 of our book, but briefly:  PSA should never be considered a one-shot, cut-and-dried reading.  Instead, it’s like having a prostate barometer, so your doctor doesn’t have to wait for the PSA level to reach a magic number before acting.  With PSA velocity, what matters is a significant change over time, and for this to be accurate, you need to have multiple PSA measurements taken in the same laboratory, because PSA measurements can vary slightly from lab to lab.

The level of change depends on your PSA number.  For men with a PSA greater than 4, an average, consistent increase of more than 0.75 ng/ml over the course of three tests is considered significant.  Let’s say that over 18 months, your PSA went up from 4.0 to 4.6 to 5.8.  Clearly, something’s going on here.

But what if your PSA is less than 4?  Walsh says:  “Because we now realize that men with PSA levels as low as 1.0 may have cancer,” guidelines have been established for PSA velocity in these men, too:  In these men, work by Carter and colleagues suggests, any consistent increase in PSA is alarming, even an increase as small as 0.35 ng/m. a year.  They also found that many years before a man’s prostate cancer was diagnosed, when his total PSA levels (as opposed to more complex PSA readings, such as a free PSA test) were still low, a PSA velocity of greater than 0.35 ng/ml a year predicted who would later die from prostate cancer.  If you have a PSA between 1 and 4 and it is consistently rising faster than about 0.4 ng/ml a year, you should get a biopsy.

What Should My PSA Be for My Age?

Be aware:  15 percent of men with a PSA level lower than 4 have prostate cancer, and 15 percent of these men with cancer have high-grade cancer, the aggressive kind that needs to be treated.  That’s why we say in the book:  “There is no safe, absolute cutoff above a PSA level of 1.0 at which a man can rest assured that he is not at risk of harboring a high-grade cancer.  Thus, what probably is going to matter the most in the future is your PSA history.”  Get that baseline PSA level in your early 40s, or at age 40 if you have a family history of prostate cancer, of cancer in general, or if you are African American.

Then, depending on the baseline level – whether you are above or below the 50th percentile for your age – take a repeat PSA test every two to five years.  If you are in your 40s and your PSA level is greater than 0.6 ng/ml, or if you are in your 50s and your PSA is greater than 0.7, you should have your PSA measured at least every two years.  If your PSA is below this percentile, you may be able to wait as long as five years for the next test.  These are Carter’s numbers.  In another study, of a larger group of men, urologists Stacy Loeb of New York University and William Catalona of Northwestern University found the comparable numbers to be 0.7 for men in their 40s and 0.9 for men in their 50s.  

So, if you’re 50 and you have a PSA of 2.5, for example, and your doctor says it’s low, that doctor is wrong.  It’s actually high for 50.  It could be prostatitis, or benign prostatic enlargement (BPH).  But it could also be cancer, and you need to get it checked out.  A good next step would be to check the free PSA, with a test such as the Prostate Health Index (PSA has various forms in the blood, and these “second-tier” PSA tests can help tell whether it’s more likely to be higher because of BPH or cancer.)   The higher the free PSA, the higher the likelihood that you are free of cancer, as Carter says.  The numbers from studies vary, but one free PSA cutoff is 25 percent.  If your free PSA is higher than that, your PSA is more likely to be elevated because of BPH than it is of cancer.  If your free PSA is lower than 25, you are more likely to have cancer.

So, basically, to sum up:  You can’t just look at a PSA number and know very much at all.  It’s like looking at a Most Wanted photo and saying, “That guy looks guilty,” or “He has kind eyes!  He’s probably been framed! He’s no criminal.”  No self-respecting detective would ever try to get a warrant based on appearance.  You investigate first.  This is why you study PSA, watch what it does, and if it’s going up, check the free PSA, with a “second-tier” PSA test such as the Prostate Health Index (PHI); you also may need a biopsy.  Don’t just give it a free pass after one test because “the number’s low.”

In addition to the book, I have written about this story and much more about prostate cancer on the Prostate Cancer Foundation’s website, pcf.org. The stories I’ve written are under the categories, “Understanding Prostate Cancer,” and “For Patients.”  As Patrick Walsh and I have said for years in our books, Knowledge is power: Saving your life may start with you going to the doctor, and knowing the right questions to ask. I hope all men will put prostate cancer on their radar. Get a baseline PSA blood test in your early 40s, and if you are of African descent, or if cancer and/or prostate cancer runs in your family, you need to be screened regularly for the disease. You should start at age 40.  Many doctors don’t do this, so it’s up to you to ask for it.

©Janet Farrar Worthington

 

 

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