I-131-MIP-1095 has entered a phase 2 randomized clinical trial

As I reported last year, a new radiopharmaceutical has entered the pack. I-131-MIP-1095, a powerful beta-particle emitter attached to a PSMA-targeted ligand, will enter a multicenter phase 2 randomized clinical trial. Progenics®, the manufacturer, put out a press release, which can be read here. (Update 4/2020) The clinical trial has begun recruiting in 17 locations in the US and Canada.

They will be testing a combination of I-131-MIP-1095 with enzalutamide (Xtandi) in patients who are metastatic, castration resistant, have not yet had chemotherapy, and who have become resistant to Zytiga. It is hoped that Xtandi will radiosensitize the cancer to the radiopharmaceutical with a resultant PSA decrease.

175 evaluable patients will be recruited; half will get the radiopharmaceutical + Xtandi, half will get Xtandi alone. All patients will be screened using DCFPyL PET/CT to assure that their metastases are PSMA-avid. The primary endpoint - the percent who have greater than 50% PSA reduction - will be collected for a year. Secondary endpoints - radiographic response, progression-free survival, and overall survival - will be reported at the end of two years.

Another radiopharmaceutical in clinical trials is Lu-177-PSMA-617 .  There are various phase 1 and 2 clinical trials in the US and internationally (see list at the end of this link).

I recently reported about the very promising outcomes of Ac-225-PSMA-617 in Germany. Patients report that they are combining Ac-225-PSMA-617 and Lu-177-PSMA-617 to get the advantages of each. Weill Cornell in NYC is investigating Ac-225-J591 in a phase 1 trial.

For information on the trial of Th-227-PSMA, see this link.

What to expect after prostate radiation (acute side effects)

Urinary, rectal and sexual side effects of treatment are usually mild and transient, although they may be worse if you are especially sensitive to radiation, are an older man, or had symptoms before you started radiation therapy. Some side effects described below may occur in many men starting anytime from a week to a month after treatment and continuing for weeks or months. The duration and intensity vary greatly between men.

If any of those symptoms interfere with your day-to-day living, call your doctor. He may be able to prescribe medication that can help alleviate those symptoms.

Urinary

Total incontinence is uncommon. There may be some leakage or dribbling. Other common side effects are irritation, burning or bleeding while urinating, feeling like you have to urinate immediately even when you know your bladder isn’t full, having to wake up several times during the night to urinate, or having to urinate frequently during the day. You may pass small amounts of blood or blood clots; however, if you are bleeding copiously when you urinate, contact your doctor immediately.

A rare but potentially serious side effect is urinary retention. If you find that you can’t urinate even though your bladder feels full, go to the Emergency Room of the nearest hospital immediately and tell them you are suffering from urinary retention. They must catheterize you to allow the urine to flow out.

Rectal

There may be a feeling like you have to pass a stool but you cannot, and this feeling may recur often. This is called tenesmus. You should be aware that that feeling is from inflammation in your rectum (proctitis), not from actual stool there, and if you strain, you may create hemorrhoids. You may have frequent bowel movements. There may be blood in your stools or blood may drip out. Hemorrhoids may occur. Sometimes stool may leak out, especially when you are passing gas. Stool may be loose, or it may be especially hard.

If you have diarrhea for more than a few days, call your doctor. If the bleeding is copious, call your doctor.

Sexual

Semen will usually dry up soon after treatment, although there may be small amounts of fluid. Occasionally, you may see some blood in that fluid or a few drops of blood may drip out after orgasm.

You may notice that, over time, erections are not as hard or as long-lasting. To protect the blood vessels supplying your penis with blood, your doctor may have prescribed Viagra or a similar medication. You should continue to take that medication for at least 6 months after the end of treatment, even though it seems like you don’t need it.

Testosterone levels often drop following radiation, but may eventually return to normal levels. Because of this, you may notice a drop in the level of your sexual desire/libido. Some men experience difficulty reaching orgasm.

If any of the symptoms are bothersome, you may want to consult with a doctor who specializes in Sexual Medicine.


For a list of all side effects, long-term and acute, see:
Adverse Effects of Primary IMRT

Survival benefit to debulking the prostate with radiation in men with low metastatic burden

The term "debulking" denotes the radical treatment (via prostatectomy or radiation) of the cancerous prostate after distant metastases have been discovered. This first randomized clinical trial of debulking with external beam radiation found that there was no overall survival benefit.

Results of the STAMPEDE randomized clinical trial were published in the Lancet. Like the HORRAD trial (see below), they found there was no survival benefit to radiation debulking among all newly diagnosed men with metastases (Stage M1). Unlike the HORRAD trial, they utilized higher radiation doses.

Newly diagnosed men were treated with standard of care (which at the time meant ADT and docetaxel in 18% of the men) and were randomized to no radiation debulking or hypofractionated radiation, consisting of either:

• 55 Gy in 20 daily treatments, or
• 36 Gy in 6 weekly treatments (note: this bioequivalent dose is 15% higher)

However it made a big difference in survival if the men were oligometastatic (1-3 distant metastases). After 37 months median follow-up:

• Survival increased by 32% (hazard ratio = 0.68) in 819 oligometastatic men
• 3 yr survival was 81% with debulking vs 73% without debulking
• No survival increase among the 1,120 polymetastatic men (defined as visceral metastases or 4 or more bone metastases with at least 1 outside the axial skeleton)

Survival increases were also noted among men with only pelvic lymph node metastases (N1M0), in whom whole pelvic radiation may be curative.

Adverse events from the radiation were generally mild:

• 5% had grade 3 (serious) or higher acute urinary or rectal side effects
• 4% had grade 3 (serious) or higher late-term urinary or rectal side effects

Based on this and their other randomized clinical trials, men with lower metastatic burden should be treated with ADT+Zytiga or ADT+docetaxel, followed in 2 months with local hypofractionated radiation. Men with higher metastatic burden should be treated with ADT+Zytiga or ADT+docetaxel (it is unknown whether ADT+Zytiga+docetaxel adds any additional benefit). Metastasis-directed therapy is under investigation.

(Update 2/18/2021) Because controversy exists in how to define "low metastatic burden," Ali et al. undertook a secondary analysis of the STAMPEDE trial. They found that the benefit of RT debulking was greatest in two groups:

1. 1-3 bone metastases (M1b) with no visceral metastases
2. Only non-pelvic lymph node metastases (M1a) with no visceral metastases

The survival benefit dropped off after 3 bone metastases. There was no benefit in anyone with any visceral metastases (M1c). Metastases are counted based on conventional imaging (bone scan/CT), so metastases found on PET scans do not count towards the total.

(Update 6/7/2022) Long-term follow-up (61 months) of the STAMPEDE trial, confirmed earlier findings:

• Survival increased by 36% if low burden
• Survival decreased by 11% if high burden (not statistically significant)
• No difference in quality of life

Boevé et al. reported the results of 432 men with bone metastases at 28 centers in the Netherlands from 2004 to 2014 (the HORRAD trial). They had received no previous treatments. They all had PSA > 20 ng/ml at the start of treatment and were under 80 years of age. They were randomized to receive either:

1. Lifelong ADT (an LHRH agonist, starting with 4 weeks of an anti-androgen)
2. Lifelong ADT + external beam radiation therapy (EBRT) 

The EBRT dose was 70 Gy (35 treatments of 2 Gy each) or 57.8 Gy (19 treatments of 3.04 Gy each), which are biologically equivalent. No whole pelvic radiation or brachy boost therapy was given.

After 47 months median follow-up, the median overall survival was:

• 45 months in the group that received ADT + EBRT
• 43 months in the group that received ADT only

The difference was not significant

The authors also looked at survival differences based on:

• Number of bone metastases (<5, 5-15, >15)
• PSA at diagnosis (greater or less than 60 ng/ml)
• Gleason score
• Stage
• Age
• Performance status
• Painful bone metastases

None made any significant difference in survival.

The time to PSA progression was slightly longer among those who received EBRT (15 months vs. 12 months), but the statistical significance vanished after correction for patient characteristics.

These disappointing results conflict with several retrospective database analyses. This once again illustrates that only prospective randomized clinical trials can prove a causal relation, and that observational studies are confounded by the vagaries of patient selection; i.e., patients who receive debulking in actual clinical practice are the ones who would do better anyway. It is worth noting that a similar thing had occurred with breast cancer. Several retrospective studies had suggested that resection of the breast tumor  plus axillary lymph nodes increased survival even when distant metastases were detected. However, Badwe et al. reported that when women were prospectively randomized to that treatment or no such treatment, there was no survival difference.

Because this trial began over a decade ago, it does not include radiation doses now considered to be curative (around 80 Gy). Nor does it include brachy boost therapy, which was shown to be superior to EBRT alone in high risk patients in the ASCENDE-RT randomized clinical trial. It is also unknown what effect whole-pelvic radiation or metastasis-directed therapy might have had, or whether prostatectomy with or without extended pelvic lymph node dissection (ePLND) may have increased survival.

(update 7/3/22) Dai et al. reported the results of an RCT among 200 men with oligometastatic PCa randomized to ADT alone or ADT with debulking the prostate with radiation or surgery (85% had surgery). After a median follow-up of 48 months:

• Radiographic progression was reduced by 57% by debulking
• Mortality was reduced by 56% by debulking
• PSA progression was reduced by 56% by debulking

These clinical trials began before CHAARTED, STAMPEDE, and LATITUDE clinical trials proved that early treatment with docetaxel and abiraterone improves survival in newly diagnosed metastatic men. It is unknown what effect debulking may have in men pre-treated with those systemic therapies.

Many of these unknowns are being explored in current clinical trials. The randomized clinical trial of debulking at 257 US locations will allow for systemic pre-treatments and either EBRT or surgery. This clinical trial in Canada allows for treatment with surgery, HDR brachytherapy, chemotherapy, and SBRT to metastases. This clinical trial in Europe allows for treatment with  docetaxel, and abiraterone. This clinical trial in Germany randomizes patients to prostatectomy + ePLND or best systemic therapy.

Because radiation and prostatectomy have adverse effects, this study should make patients cautious about having any kind of debulking outside of a clinical trial.

Free Randomized Clinical Trial of Ga-68-PSMA-11 PET indicator at UCLA

UCLA is now running a randomized clinical trial of the Ga-68-PSMA-11 PET indicator for men  with a recurrence (PSA≥ 0.1 ng/ml) after prostatectomy who are considering salvage radiation therapy (SRT). They are expanding and adding a control arm to the trial they did earlier (see this link) that found that the PSMA-based PET scan was able to change treatment decisions in about half the men.

Here are the trial details and the contact info:
https://clinicaltrials.gov/ct2/show/NCT03582774

UCLA normally charges $2650 for the PET indicator, so this is an opportunity to save some money. If a patient is randomized to the control group, he may still get an Axumin PET scan when his PSA is confirmed above 0.2 ng/ml, which is covered by Medicare and most insurance. The Axumin PET scan only detects cancer in 38% of patients if their PSA is in the range of 0.2-1.0 ng/ml, while the Ga-68-PSMA-11 PET scan detects cancer in about 27%-58% of recurrent men whose PSA is between 0.2 and 0.5. UCLA recently completed another free clinical trial comparing Axumin to Ga-68-PSMA.

I'm told that the NIH trial of another PSMA PET indicator, DCFPyL, has a waiting list of 2-3 months, and they are no longer taking patients whose PSA is below 0.5 ng/ml. It is possible to pay for PSMA-based PET scans in Germany and Australia. The newest and perhaps most accurate PSMA-based PET indicator, F(18)-PSMA-1007, is in clinical trials in Germany (see this link).

This trial is not open to men who have already had SRT, have known metastases, have had ADT within the last 3 months, or who cannot have radiation for any reason.

Salvage Radiation Dose: Decision-Making Under Uncertainty

A large, well-done, confirmed randomized clinical trial (RCT) is the only evidence that proves that one therapy is better than another. According to current consensus, this is deemed "Level 1a" evidence. But this high level of evidence is seldom available. This is especially true of prostate cancer because it takes so long to achieve acceptable endpoints like overall survival, prostate cancer-specific survival, and metastasis-free survival. Such studies are very expensive and difficult to carry out.

Alexidis et al. analyzed the National Cancer Database for men treated with adjuvant or salvage radiation therapy (SRT) after prostatectomy failure from 2003 to 2012. SRT with doses above 66.6 Gy were labeled "high dose," and SRT with doses above 70.2 Gy were labeled "very high dose." Between 2003 and 2012:

• High dose SRT utilization increased from 30% to 64%
• Very high dose SRT utilization increased from 5% to 11%
• Utilization of high and very high dose rates was greatest at academic centers, lowest at community centers.

The authors decry the fact that this doubling of high dose SRT took place in the absence of RCTs that would definitively establish proof. They point out that the evidence for it is based on observational studies (see, for example, King and Kapp and Ohri et al.), which are fraught with confounding due to stage migration,  selection bias and ascertainment bias. Stage migration was the result of better imaging becoming increasingly available to rule out SRT from patients already harboring occult distant metastases. Also, three randomized clinical trials published in the middle of the observational period convinced many radiation oncologists that earlier SRT led to better tumor control than waiting. Selection bias occurred because the patients selected to get higher doses of radiation were healthier and those whose cancer was less progressed -- they would have done better regardless of the dose. Ascertainment bias resulted from the longer observational period for patients treated in 2003 vs. 2012 - the opportunity for treatment failure increases with the amount of time that has passed. The authors also doubt that biochemical recurrence-free survival (which is what was used in observational studies) is a good enough surrogate endpoint for overall survival. They are right that all these factors may be confounding the previous retrospective analyses, and the only way to know with certainty is to conduct a trial where patients are randomized to receive high or low SRT doses,  and follow patients long enough so that median survival or at least metastasis-free survival is reached in the low dose group.

There has been one randomized clinical trial of SRT dose escalation in the modern era. The SAKK 09/10 trial found little difference in acute toxicity symptoms at 70 Gy compared to 64 Gy, but patient-reported urinary symptoms worsened. Unfortunately, many patients were treated with three-dimensional conformal radiation therapy (3D-CRT), which had higher toxicity than the IMRT in widespread use now. Also, it uses freedom from biochemical failure (not yet reported) as its surrogate endpoint.

So, what is a patient to do in the absence of Level 1a evidence? Should he accept the higher doses with possibly added toxicity and better tumor control, or should he go for a lower dose with possibly less toxicity and less tumor control?

As a compromise, Mantini et al. recently reported 5-year biochemical disease-free survival (bDFS) and other outcomes for patients who received higher dose SRT (70.2 Gy vs. 64.8 Gy) depending on their post-operative pathology. They also may have received (depending on pathology) whole pelvic radiation and adjuvant hormone therapy. Those patients who received the higher dose had equivalent 5-yr bDFS in spite of their worse disease characteristics. Those who received only 64.8 Gy still had a 5-year bDFS as high as 92%. We do not know how many of those recurrent men with favorable disease characteristics actually needed any SRT. They were all treated with 3D-CRT and toxicity was not reported.

The other thing we can do when our information is imperfect is go through the Bradford Hill checklist. It can give us more confidence if we have to make a decision based on less than Level 1 evidence. The factors that ought to be considered are:

• Strength of Association (larger associations are more likely (but not necessarily) causal)
• Consistency of Data (independent studies all lead to the same conclusion)
• Specificity (a very specific population is differentially affected)
• Temporality (the effect has to occur after the cause)
• Biological gradient (too some extent, more drug/radiation dose leads to more effect) 
• Plausibility (one can come up with a plausible explanation)
• Coherence (lab studies demonstrate a plausible mechanism for the observed effect)
• Experiment (has the effect been prevented by modifying the cause)
• Analogy (similar factors may be considered)

Unfortunately, the authors did not refer to Dr. King's more recent analysis of SRT dose/response, which we discussed in depth here. He looked at 71 studies, demonstrating consistency. While it is not Level 1 evidence, it is Level 2a evidence. In it, he observes that the salvage radiation dose response conforms exactly to the primary radiation dose response.  In other words, the prostate tumor is equally radio-resistant whether it is in the prostate or the prostate bed. This increases the plausibility of a dose effect of SRT. What's more, dose escalation was proven to be beneficial for biochemical recurrence-free survival, metastasis-free survival, and freedom from lifelong ADT use, for primary radiation in intermediate risk men by a RCT (RTOG 0126). So, we also have greater confidence in SRT dose escalation by analogy.

RTOG 0126 did not find an increase with higher dose in 8-year overall survival or cancer-specific survival. This calls into question whether these longer-term effects are really useful endpoints if we are to be able to obtain and use the results of any clinical trial in a reasonable time frame.

Dr. King proposed a randomized clinical trial of 76 Gy vs. 66 Gy for SRT. Meanwhile, he is routinely giving his SRT patients at UCLA 72 Gy. Dr. Zelefsky at Memorial Sloan Kettering Cancer Center and other eminent radiation oncologists have also upped the radiation dose to 72 Gy. Such doses seem to be safe and effective, but it is one of many factors in the SRT treatment decision that must be carefully considered by patients and their doctors.

F18-PSMA-1007 - the latest PSMA-based PET indicator

The development of new PET indicators for prostate cancer continues. As we've seen, the Ga-68-PSMA-11 indicator is already making a difference in clinical practice. Many of the new PET indicators have been developed in Germany, although the best one so far before this, F18-DCFPyL was developed at Johns Hopkins.

Researchers in Germany have developed a new PSMA-based PET indicator, F18-PSMA-1007, that seems to be even better. They tested it on 251 biochemically recurrent (after prostatectomy) patients at 3 academic centers.

• 81% had a recurrence detected
• 44% had a local (prostate bed) recurrence
• 41% had a pelvic lymph node recurrence
• 20% had a retroperitoneal lymph node recurrence
• 12% in lymph nodes above the diaphagm
• 40% had bone metastases
• 4% had visceral organ metastases

Detection rates varied by PSA:

• 62% in those with PSAs from 0.2-<0.5
• 75%  in those with PSAs from 0.5-<1.0
• 90%  in those with PSAs from 1.0-<2.0
• 94%  in those with PSAs >2.0

Interestingly, those who had ADT in the last 6 months had higher detection rates (92%) compared to those who'd had no ADT recently (78%). This may be because those who had ADT recently had more advanced tumors. There was some early evidence in mice and lab studies (like this one and this one) that ADT upregulated PSMA. One clinical study indicated that ADT improved detection of PSMA. Two studies  (this one and this one) showed no effect of ADT on PSMA detection. More recent evidence indicates use of ADT negatively impacts detection rates. The patient should avoid ADT before getting a PSMA-based PET scan, if possible.

The detection rate among those with PSAs between 0.2-2.0 was 78%, which is comparable to the 88% detection rate reported for men with PSAs between 0.2-3.5 for F18-DCFPyL and much better than the detection rate of 66% reported for Ga-68-PSMA-11 in that PSA range. F18 has an advantage over Ga-68 in having a longer half-life (118 minutes vs 68 minutes) and is more tightly bound to the ligand. Because it is not appreciably excreted through the urinary tract, it can be seen more easily around the prostate - important when the recurrence is near the site of the anastomosis, as most recurrences are. In a mouse study, it was superior to F18-DCFPyL. In a clinical pilot study, they both detected the same tumors.

As of now, the F18 PSMA-based PET indicators seem to be superior, but others are working on ligands that detect other prostate cancer proteins more sensitively and more specifically. Leading candidates are hK2, FMAU, Citrate, Prostate-Stem-Cell-Antigen, , DHT/androgen receptor, uPAR receptor, VPAC receptor, or multiple ligands.

Also see:

PET scans for prostate cancer

The Danger of Complementary and Alternative Medicine

Researchers at Yale did two database analyses. They looked at the National Cancer Database and found 1,901,805 patients who were treated for either nonmetastatic prostate, breast, lung or colorectal cancer between 2004 and 2013. In one analysis they looked at use of complementary medicine; in the other, they looked at use of alternative medicine.

Complementary medicine was defined as use of “other-unproven: cancer treatments administered by nonmedical personnel” in addition to at least one conventional cancer treatment modality, defined as surgery, radiotherapy, chemotherapy, and/or hormone therapy. 258 patients who chose a complementary therapy were matched to 1032 patients who did not use any complementary medicine on age, clinical group stage, Charlson-Deyo comorbidity score (CDCS), insurance type, race/ethnicity, year of diagnosis, and cancer type using the propensity score matching technique.

After 5 years of follow-up, comparing users of complementary medicine to matched non-users:

• There was no difference in delay of treatment, but there was a greater probability of refusal of surgery (7% vs 0.1%), chemo (34% vs 3%), radiotherapy (53% vs 2%), and hormone therapy (34% vs 3%).
• 82% survived for 5 years vs 87% among non-users, and were 2.1 times more likely to die after adjustment.
• The differences in survival were attributable to refusal of conventional treatment.
• Differences in 5-year survival were significant for breast cancer (85% vs 90%), and colorectal cancer  (82% vs 84%), but not for lung cancer  or prostate cancer. 

Alternative medicine was defined as “other-unproven: cancer treatments administered by nonmedical personnel” and who also did not receive conventional cancer therapy, defined as chemotherapy, radiotherapy, surgery, and/or hormone therapy. 281 patients who used alternative medicine were matched to 560 patients with similar characteristics (cancer type, age, clinical group stage, CDCS, insurance type, race, and year of diagnosis) who did not use alternative therapies using propensity score matching.

After 66 months median follow-up, comparing users of alternative medicine to matched non-users:

• 55% survived for 5 years vs 78% among non-users, and were 2.5 times more likely to die after adjustment.
• Differences in 5-year survival were significant for breast cancer (58% vs 87%), lung cancer (20% vs 41%), colorectal cancer  (33% vs 88%), but not prostate cancer  (86% vs 95%)
• The survival curves for prostate cancer had just begun to diverge at 5 years (75% were low or intermediate risk).

Complementary and alternative medicines consisted of herbs and botanicals, vitamins and minerals, probiotics, Ayurvedic medicine, traditional Chinese medicine, homeopathy and naturopathy, deep breathing, yoga, Tai Chi, Qi Gong, acupuncture, chiropractic or osteopathic manipulation, meditation, massage, prayer, special diets, progressive relaxation, and/or guided imagery.

Although these observational studies did not follow prostate cancer patients long enough to detect differences in survival, we see the damage that use of both complementary and alternative medicines had on patients with more virulent cancers. Patients who get complementary medicine are more likely to refuse conventional treatments (even though they received at least one conventional treatment) and are about twice as likely to die because of that decision.

(update 5/2019) The CAPSURE database shows that the use of complementary and alternative medicines among men with prostate cancer is increasing. Comparing the period of 2006-2010 to 2011-2016. They report that:

• Use of complementary medicines increase +128% (from 24% to 54%)
• Vitamin D use has more than doubled in spite of Level 1 evidence that supplementing confers no benefit.
• Happily, Vitamin E use has decreased based on Level 1 evidence from the SELECT trial.
• Almost a quarter of men with prostate cancer take omega-3 fatty acids. A secondary analysis of omega-3 use in the SELECT trial, confirming an earlier study, found an association between high omega-3 fatty acid serum levels and increased risk of prostate cancer. Level 1 evidence showed no association with prostate cancer incidence or prostate cancer death.

note: Level 1 evidence means that a cause/effect relationship was proven by a large randomized clinical trial (RCT). Interested readers may consult the Oxford definition, which is widely accepted. Many patients rely on mouse and lab studies which are almost always disproven when tried in clinical trials. They constitute the lowest quality of evidence (Level 5), and should only be used for hypothesis generation for clinical trials or to demonstrate plausibility for a cause/effect relationship found in an RCT. Additionally, the Bradford Hill checklist is used.

Vitamin D has no effect on prostate cancer, heart disease, or bone mineral density*

(updated)

Observational studies have reported conflicting effects of Vitamin D on prostate cancer - some reported no association (as in this study), some reported a positive association (as in this study), and some reported an inverse association (as in this study). We now have three large randomized clinical trials (Level 1a evidence) that show that large doses of Vitamin D have no effect on cancer incidence or deaths. This trumps all previous observational and epidemiological studies.

Manson et al.  reported the results of the VITAL randomized clinical trial (RCT) on 25,871 (including 5,000 African-Americans) men over 50 and women over 55 who were given either:

1. Vitamin D3 at 2,000 IU per day and marine omega-3 fatty acids (1000 mg/day containing 840 mg EPA and DHA)
2. Vitamin D3 placebo and fish oil placebo
3. Fish oil and Vitamin D3 placebo
4. Vitamin D3 and fish oil placebo

Blood samples were taken and questionnaires were administered to assure compliance. The group assignment was double-blind. Participants agreed to keep vitamin D from all other sources (like sunlight, milk, multi-vitamins, etc.) to under 800 IU per day.

After a year, serum 25-hydroxyVitamin D increased from 30 ng/ml to 42 ng/ml among those supplementing Vitamin D and didn't change in the placebo groups.

After 5.3 years of follow-up, there was:

• No difference in incidence any kind of cancer (including prostate, breast and colorectal cancers) between Vitamin D3 and Placebo.
• No difference in deaths from any kind of cancer
• Low BMI  (<25) may potentiate the effect of Vitamin D on cancer.
• No difference in any kind of cardiovascular disease, including myocardial infarction, stroke or death from myocardial causes or of interventions like PCI or coronary bypass.
• There was no synergism with omega-3 fatty acids.
• There were no statistically significant differences in any subgroup.

Manson et al. also did a separate analysis of omega-3 fatty acids. After 5.3 years of follow-up, there was:

• No difference in incidence any kind of cancer (including prostate, breast and colorectal cancers) between omega-3 and Placebo.
• No difference in deaths from any kind of cancer.
• There was no synergism with Vitamin D.
• Those with low fish consumption (<1.5 servings per week) may gain some cardiovascular benefit from omega-3 supplementation.
• No difference in cardiovascular disease overall, stroke or death or of interventions like PCI or coronary bypass.
• There was significant improvement in the rate of myocardial infarctions and total coronary heart disease among those taking omega-3s.
• African-Americans, especially those with multiple CV risk factors, taking omega-3s had lower incidence of myocardial infarctions.
• Myocardial infarctions (MI) were also better for those taking omega-3s among younger people (<67), men, smokers, diabetics, people with hypertension, people taking cholesterol medications, no parental history of MI, 3 or more risk factors, baseline aspirin use, and baseline statin use.

(update 11/18/20) Chandler et al. reported on an updated analysis of the VITAL RCT. They looked at whether Vitamin D supplementation affected the risk of developing metastatic or fatal cancer among people who were cancer-free at baseline. With a median intervention period of 5.3 years, there was almost no chance of finding metastatic or fatal prostate cancer in men who were prostate cancer-free at baseline (In the ProtecT trial, 10-year prostate cancer survival among men initially diagnosed with localized prostate cancer was 99%, and metastasis-free survival was 96%.) Because the metastasis-free and cause-specific survival with prostate cancer are so long when starting from a "no cancer" diagnosis, the authors looked for the effect on other cancers, excluding prostate cancer. They found:

• there were no significant differences due to Vitamin D on the incidence of any cancer
• there were no significant differences due to Vitamin D on the metastatic spread across all cancers
• there were no significant differences due to Vitamin D on all-cancer mortality
• Adding together metastases and fatalities due to all cancers, the difference (2.1% vs 1.7%) was statistically significant, especially after the first two years
• The reduction was only statistically significant among those with a normal body-mass index (<25)
• For prostate cancer patients, there were only 6 such cases among those who got Vitamin D and 14 such cases among those who got the placebo - not significantly different. Presumably, they were missed at diagnosis or had a rare virulent type of PCa.

(Update 3/16/2021) in an ancillary analysis of the VITAL trial data, Albert et al. reported that neither Vitamin D nor Omega-3 supplementation had any effect on the incidence of atrial fibrillation.

(update 2/19/2022) Neale et al. reported the results of the D-Health RCT. This was a randomized double-blind prospective trial among 21,315 Australians aged 60 or over.

• 10,662 were given Vitamin D; 10,653 were given a placebo
• Vitamin D3 was given as 60,000 IU/month for 5 years
• A random sample of both groups was checked for compliance via a blood test for serum 25-hydroxyVitamin D; it was 115 nmol/L in the treatment group vs 77 nmol/L in the placebo group.

After 5 years of follow-up:

• There was no statistically significant difference in the number of deaths (5% in each group)
• There was no statistically significant difference in cardiovascular disease mortality
• There was no statistically significant difference in cancer mortality
• There was no statistically significant difference in all other causes of mortality
• Excluding those who died during the first 2 years of follow-up, cancer mortality was 24% higher among those taking Vitamin D

Scragg et al. in a post-hoc analysis of the ViDA trial reported on 5,110 50-84 year-old people seen in community practice in NZ between 2011 and 2012. The study was originally set up to investigate cardiovascular benefit to Vitamin D supplementation (it found none), but they also asked about incidence of cancer and tracked deaths from cancer.

• 2558 were given Vitamin D; 2552 were given a placebo
• Vitamin D3 was initially given as one 200,000 IU pill, followed by 100,000 IU monthly pills
• Serum 25-hydroxyVitamin D was 26.5 ng/ml (seasonally adjusted) at baseline
• Serum 25-hydroxyVitamin D consistently increased by 20 ng/ml among a sample of treated patients
• Compliance was excellent
• There was no difference in the percent who took calcium or Vitamin D supplements or in sun exposure

After a median of 3.3 years of follow-up, there were:

• 375 new cancer cases; 60 died of new cancers. 
• 24% had a pre-existing cancer diagnosis; 29 died
• no significant difference between the Vitamin D cohort and the placebo cohort in the number of new cancers or cancer deaths.
• 6% had a pre-existing prostate cancer diagnosis; 7 died
• 64 new cases of prostate cancer (1 died)
• no significant difference between the Vitamin D cohort and the placebo cohort in the number of new prostate cancers or in prostate cancer deaths.

One can argue that a consistent daily Vitamin D3 intake might have had an effect, or that it takes more than 3 years for an effect (whether beneficial or increased risk) to be observed. There is, at present, only observational studies for either assertion. Sample size prevents consideration of the hypothesis that Vitamin D may prevent early growth of prostate cancer but may accelerate metastases (as in this mouse study).

Jiang et al. report the results of a Mendelian randomization study of the causal connection between serum Vitamin D levels and prostate cancer. They identified 6 genetic mutations associated with low serum levels and looked for them in 79,148 men who were diagnosed with prostate cancer. They found no greater incidence of those genetic mutations in men with prostate cancer or advanced prostate cancer. Nor was there any association in women with breast cancer. The genetic mutations were also not statistically different in 73,699 people who did not have breast or prostate cancer. This proves there is no causal connection between low Vitamin D and prostate cancer.

No Effect or Negative Effect on Bone Mineral Density*

Some men on hormone therapy take Vitamin D and calcium for the purpose of maintaining bone mineral density (BMD). 

(update 7/27/22) An update of the VITAL randomized clinical trial reported no difference in fractures among people supplementing Vitamin D vs. people not supplementing it. There were no differences by age, sex, race, BMI, baseline use of calcium or Vitamin D supplements, or serum Vitamin D levels.

Reid et al. reported that Vitamin D supplementation had no effect on bone mineral density. They further noted that lower doses had more effect than higher doses, probably because Vitamin D has been found to pull calcium out of bones at high doses. However, Datta and Schwartz reported that at 200-500 IU/day Vitamin D and 400 mg-1,000 mg calcium supplementation had no effect on men's bone mineral density. Calcium supplementation has been associated with increased risk of prostate cancer (see this link or this link). Trajanoska et al. found that mutations in the genes responsible for regulating serum Vitamin D levels had no effect on fracture risk, nor did the genes regulating the tolerance for dairy (which is correlated with calcium intake). They also question the routine use of Vitamin D and calcium supplements in men who are taking Xgeva or a bisphosphonate like Zometa to preserve bone mineral density. (Estrogen patches may also prevent loss of bone mineral density.) They wrote:

Studies seeking to show whether these supplements do increase the efficacy of osteoporotic treatment or decrease adverse events (that is, hypocalcaemia) are lacking. In either case, screening for vitamin D deficiency and seeking its correction should be warranted before the initiation of anti-resorptive treatment [e.g., Zometa or Xgeva].  Moreover, in a recent mendelian randomisation study investigating the role of vitamin D in maintaining bone mineral density, increased levels of vitamin D had no effect on bone mineral density measured by [DEXA scan]. However, increased 25-hydroxy-vitamin D was associated with a slight reduction in heel bone mineral density estimated by ultrasonography. These results are consistent with our mendelian randomisation findings of no causal effect of vitamin D levels on fracture.

(Update 9/2/2019) Burt et al. published the results of a randomized clinical trial (RCT) of three different doses of Vitamin D on the bone mineral density of 311 men with 3 years of follow up. The experiment was set up as follows:

• 1/3 received 400 IU/day; 1/3 received 4000 IU/day; 1/3 received 10,000 IU/day
• none had osteoporosis at baseline
• all had baseline serum Vitamin D between 30-125 nmol/L (12-50 ng/ml)
• those whose total intake of calcium (dietary+supplements) was < 1200 mg/day received calcium supplements
• baseline serum calcium was 8.4-10.2 mg/dl
• 53% were men
• average age was 62 (range:55-70)

After 3 years on their vitamin D regimen:

• Serum Vitamin D was 77 nmol/L, 132 nmol/L, and 144 nmol/L in those taking 400 IU/day, 4000 IU/day, and 10,000 IU/day, respectively
• BMD in the radius bone of the arm decreased in all groups in a dose-dependent manner:
• -1.2% in the 400 IU/day group
• -2.4% in the 4,000 IU/day group
• -3.5% in the 10,000 IU/day group
• Hypercalcemia (too much calcium in the blood) and hypercalciuria (too much calcium in the urine) increased with increased Vitamin D dose
• Kidney/liver dysfunction, falls, fractures and cancer did not vary with dose.

In a Medpage interview, the authors point out that this is plausible because of two effects of Vitamin D:

• It increased bone resorption (more than bone formation), as measured by an increase in CTx.
• It increased parathyroid hormone, either directly or by increasing calcium absorption from the gut

The study did not include people taking bisphosphonates, Zometa or Xgeva.

Also, the dose-dependent effect (higher doses were more damaging than lower doses) increases the plausibility of this being a real effect.

(update 3/23/24) *Peppone et al. found in a small randomized trial that ultra-high doses of Vitamin D (50,000 IU/wk!) could lessen the deleterious effect on BMD of  ADT in men who recently (last 6 months) started ADT and had low-end baseline serum Vitamin D (<27 ng/ml). Even so, they still lost BMD after 24 weeks of ADT but at about ⅓ the rate of those who only took much smaller amounts of Vitamin D. There were no differences in toxicity at 24 weeks. Of course, these men started with a deficiency, only took ADT for a short time, and they weren't followed long enough for the megadoses of Vitamin D to rob their bones of BMD.

 It’s worth noting that Vitamin D, unlike other vitamins, is a steroid. Steroids tend to interact and to have wide-ranging effects in humans. Overwhelming our steroid-control systems with massive doses of any one steroid is bound to have unintended consequences.

Possible increase in testosterone 

It should be remembered that Vitamin D is a steroidal hormone (like testosterone, estrogen, progesterone, and cortisol) and there are receptors for it on virtually all cells, healthy and cancerous. It has far-ranging effects. It also is part of the human biochemical factory that inter-converts many different kinds of steroids. In fact, Anic et al. showed there was a positive association between serum Vitamin D level and the amount of serum testosterone - not an effect that a man who is taking androgen deprivation wants.

Given that Vitamin D has no effect on incidence of cancer or cancer mortality, that it has no cardiovascular benefit, and no effect on bone mineral density, there is no reason to take supplemental Vitamin D unless serum levels are too low (below 20 ng/ml). 

Supplementing Vitamin D and Calcium increases risk of Myocardial Infarction

Li et al., Xiao et al., and Boland et al. reported that supplementing calcium, but not dietary calcium intake, was associated with a higher risk of myocardial infarction, and increased rates of plaque deposition (see this link). Kassis et al. found the association was true whether or not Vitamin D was supplemented with it. It is possible that increasing calcium absorption using Vitamin D may increase the risk of myocardial infarction. It also increases the risk of kidney stones.

The Best Therapy for Gleason 10s

We recently saw (see this link) that men diagnosed with Gleason score (GS) of 9 or 10 had lower rates of metastases and better prostate-cancer survival if they were treated with a combination of external beam radiation (EBRT) plus a brachytherapy boost to the prostate ("brachy boost therapy" - BBT) than if they were initially treated with EBRT, or if they were initially treated with surgery (RP). The same researchers looked at a subset of patients who were initially diagnosed as GS 10.

There were only 112 patients who were biopsy-determined as GS 10. Of those,

• 26 were initially treated with RP (median age 61)
• 48 were initially treated with EBRT (median age 68)
• 38 were initially treated with BBT (median age 67)

The median follow-up was relatively short:

• 3.9 years for RP
• 4.8 years for EBRT
• 5.7 years for BBT

• Upfront androgen deprivation was given to 98% of EBRT patients vs. 79% of BBT patients
• Post RP radiation was given to 34%
• Pre-RP systemic therapy was given to 35%

By 5 years of follow-up:

• Only 3% of the BBT cohort received systemic salvage therapy vs. 23% of the RP group and 21% of the EBRT group
• Distant-metastasis-free survival (adjusted) was 64% for RP,  62% for EBRT, and 87% for BBT
• Prostate cancer-specific survival (adjusted) was 87% for RP. 75% for EBRT, and 94% for BBT
• Overall survival was not significantly different in the 5-year time frame

While GS 10 is often more aggressive, it is noteworthy that 87% of those receiving BBT had no distant metastases detected within 5 years. Among men who received RP,  57% were upstaged to T3/4 and 41% were downgraded to GS 7-10 by post-prostatectomy pathology. We have no reason to believe those percentages would differ markedly among those who received radiation.

Although the numbers here are small, this is the largest analysis of Gleason 10s broken down by the therapy that they received that we have ever seen. Only a randomized clinical trial can provide a definitive answer. Given the aggressive course of GS 10, patients with this diagnosis are advised to talk to a radiation oncologist who specializes in this therapy.

First randomized clinical trial of SBRT

In the first trial ever to randomly assign patients to extreme hypofractionation, primary radiation therapy delivered in just 7 treatments had the same effectiveness and safety as 39 treatments.

The results of the HYPO-RT-PC randomized clinical trial were published in The Lancet. There was an earlier report on toxicity. Details of the trial specs are available here. Between 2005 and 2015, they enrolled 1200 intermediate- and high-risk patients at 12 centers in Sweden and Denmark to receive either:

1. Conventional fractionation: 78 Gy in 39 fractions
2. SBRT (stereotactic body radiation therapy): 42.7 Gy in 7 fractions

The biologically effective dose is 19% higher for SBRT in terms of cancer control. The biologically effective doses are equivalent in terms of toxicity.

The patients were all intermediate (89%) to high risk (11%), defined as:

1. Stage T1c-T3a
2. PSA> 10 ng/ml 
3. Gleason score ≥7

80% of the men were treated with a technology called three-dimensional conformal radiation therapy (3D-CRT), which is seldom used for prostate cancer external beam therapy anymore at major tertiary care centers. It is never used for SBRT in the US because it is considered not precise enough, and too toxic. SBRT is usually delivered in 4 or 5 fractions in the US. CyberKnife and VMAT are the most common technologies in use, and use of sophisticated image guidance throughout each treatment is a common practice.

With follow-up of 1,180 patients for 5 years, they report biochemical recurrence-free survival of 84% in both arms of the study.

They also reported updated late-toxicity results. By 5 years after treatment:

• Grade 2+ urinary toxicity was 5% for conventional fractionation, 5% for SBRT - no significant difference.
• Grade 2+ rectal toxicity was 4% for conventional fractionation, 1% for SBRT - no significant difference.

Up until now, we've only had reports from clinical trials using SBRT (like this one) or conventional fractionation (like this one), and it could have been reasonably argued that SBRT results looked good because of selection bias. With this study, we now have Level 1 evidence of non-inferiority. This will not be surprising to those of us who have followed the randomized clinical trials of moderately hypofractionation vs. conventional fractionation (see this link). This will be hailed as a victory for patients who no longer have to endure and pay the high cost of 8 weeks of treatments. radiation oncologists, who are reimbursed by the number of treatments they deliver, probably will not be as thrilled.