Navigation Links
Prostate Cancer Test a Flop in Study
Date:5/3/2010

Doesn't distinguish aggressive tumors from slow-moving malignancies

MONDAY, May 3 (HealthDay News) -- A technique that urologists had hoped would make it possible to distinguish men with prostate cancer who need treatment from those who would only need watchful waiting didn't work well, researchers report.

The technique, called PSA kinetics, measures changes in the rate at which the prostate gland produces a protein called prostate-specific antigen. A significant increase in PSA kinetics, measured by the time during which PSA production doubles or increases at a rapid rate, is supposed to indicate the need for treatment, by radiation therapy or surgery.

PSA kinetics has long been used to measure the effectiveness of treatment. A number of cancer centers have started to use it as a possible method of distinguishing aggressive cancers that require treatment from those that are so slow-growing that they can safely be left alone.

Recent studies indicating that many men with slow-growing prostate cancers undergo unnecessary treatment have given urgency to the search for such a tool, especially considering that side effects of treatment can include incontinence and impotence.

But the study indicates that "PSA kinetics doesn't seem to be enough to show you who you should follow and who you should treat," said Dr. Ashley E. Ross, a urology resident at the Johns Hopkins University Brady Urological Institute, and lead author of a report on the technique published online May 3 in the Journal of Clinical Oncology.

The report describes the results of PSA kinetics measurements of 290 men with low-grade prostate cancer -- the kind that often doesn't require treatment -- for an average of 2.9 years. The results of PSA tests were compared with biopsies -- tissue samples -- that measured the progression of the cancers.

The trial is part of a study, under supervision of Dr. H. Ballentine Carter, director of the division of adult urology at the Brady Urological Institute, that began in 1994. Men in the trial had PSA tests every six months and biopsies every year.

"PSA values do not predict progression by biopsy," Ross said. "There were huge overlaps between people who had higher or lower values. They were not predictive of if you had more disease or more aggressive disease."

And so the findings do not support the hope that PSA kinetics might lessen the need for frequent biopsies, Ross said. "You need to biopsy these men yearly or less than that," he said.

But the issue is still open, said Dr. Jared Whitson, a clinical instructor in urology at the University of California, San Francisco, who wrote an accompanying editorial.

There might have been "selection bias" in the study, Whitson said, since many men under watchful waiting at the institute were not included in the trial. "We don't know a lot about the 300 patients who were in active surveillance but not included in the trial," he said.

In addition, "there is some prior evidence to suggest that PSA kinetics are associated with biopsy progression," Whitson said.

There was such evidence in a Canadian trial, Ross acknowledged, but "in the Canadian study there were men with a lot more cancer than we would be comfortable following. We only select men with very little cancer."

So it is too early to give up on PSA kinetics as a method of determining who should be treated, Whitson said. But it is only one of the tools that should be used to make a decision, he said. "There is no one feature or factor which can singlehandedly prompt intervention," Whitson said. Other standard markers, such as Gleason score, a measure of a cancer's degree of disorganization, must also be used, he said.

More information

For a complete rundown on prostate cancer, visit the U.S. National Cancer Institute.



SOURCES: Ashley E. Ross, M.D., Ph.D., urology resident, Johns Hopkins University, James Buchanan Brady Urological Institute, Baltimore; Jared Whitson, M.D., clinical instructor, urology, University of California, San Francisco; May 3, 2010, Journal of Clinical Oncology, online


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. FDA Reviews Side Effects From Prostate Cancer Therapy
2. Dana-Farber/Provenge: Approval of prostate cancer immunotherapy-new era of cancer treatments
3. FDA Approval of new Prostate Treatment Shows Promise of Cancer Immunotherapy
4. Prostate Cancer Vaccine Gains FDA Approval
5. Prostate Cancer Vaccine May Get FDA Approval
6. Prostate cancer: Risk increases with the number of affected family members
7. ASTRO president speaks on prostate cancer at MEDCAC meeting
8. Does the weather cause northerners to get more prostate cancer?
9. Weather Might Influence Prostate Cancer
10. Weight Gain, Smoking May Make Prostate Cancer Deadlier
11. Weight Gain, Smoking May Make Prostate Cancer More Deadly
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/26/2016)... ... June 26, 2016 , ... PawPaws brand pet supplements ... that was developed to enhance the health of felines. The formula is all-natural and ... main herbs in the PawPaws Cat Kidney Support Supplement Soft Chews are ...
(Date:6/25/2016)... ... , ... Austin residents seeking Mohs surgery services, can now turn to Dr. ... Russell Peckham for medical and surgical dermatology. , Dr. Dorsey brings specialization to include ... in Mohs Micrographic Surgery completed by Dr. Dorsey was under the direction of Glenn ...
(Date:6/25/2016)... CA (PRWEB) , ... June 25, 2016 , ... As ... with Magna Cum Laude and his M.D from the David Geffen School of Medicine ... and returned to Los Angeles to complete his fellowship in hematology/oncology at the UCLA-Olive ...
(Date:6/24/2016)... ... June 24, 2016 , ... A recent article published June 14 ... The article goes on to state that individuals are now more comfortable seeking to ... operations such as calf and cheek reduction. The Los Angeles area medical group, Beverly ...
(Date:6/24/2016)... ... June 24, 2016 , ... The Pulmonary Hypertension Association (PHA) ... will receive two significant new grants to support its work to advance research ... anniversary by recognizing patients, medical professionals and scientists for their work in fighting ...
Breaking Medicine News(10 mins):
(Date:6/24/2016)... , June 24, 2016  Collagen Matrix, ... design, development and manufacturing of collagen and mineral ... announced today that Bill Messer has ... Marketing to further leverage the growing portfolio of ... devices. Bill joins the Collagen Matrix ...
(Date:6/24/2016)... -- The Academy of Managed Care Pharmacy (AMCP) today ... allow biopharmaceutical companies to more easily share health care ... coverage decisions, a move that addresses the growing need ... The recommendations address restrictions in the sharing of product ... a prohibition that hinders decision makers from accessing HCEI ...
(Date:6/24/2016)... 2016   Pulmatrix, Inc ., (NASDAQ: ... drugs, announced today that it was added to the ... its comprehensive set of U.S. and global equity indexes ... important milestone for Pulmatrix," said Chief Executive Officer ... our progress in developing drugs for crucial unmet medical ...
Breaking Medicine Technology: