Navigation Links
PSA screening may be biased against obese men, leading to more aggressive cancers

DURHAM, N.C. -- Testing men for elevated levels of prostate-specific antigen (PSA) in the blood -- the gold standard screening test for prostate cancer -- may be biased against obese men, whose PSA levels tend to be deceptively low. And this bias may be creating more aggressive cancers in this population by delaying diagnosis, according to a new study led by investigators in the Duke Prostate Center and the Durham Veterans Affairs (VA) Medical Center.

"We know that obese men tend to have lower PSA values than their normal-weight counterparts, possibly caused by larger blood volumes which dilute the readings," said Stephen Freedland, M.D., a urologist at Duke and the Durham VA, and lead investigator on this study. "Now we know some of the real implications of this -- that these men are at a disadvantage in terms of prognosis compared to normal-weight men."

The researchers published their findings online in the journal BJU International. The study was funded by the United States Department of Veterans Affairs, the National Institutes of Health, the Georgia Cancer Coalition, the United States Department of Defense, the Prostate Cancer Research Program and the American Urological Association Foundation's Astellas Rising Star in Urology Award, given to Freedland.

"We used patient data to examine the association between body mass index, or BMI -- a measure of obesity -- and the amount of disease discovered after surgery to remove the prostate, " Freedland said. "We compared men who had their cancers detected by PSA screening to those who had an abnormal digital rectal exam, which may not confer the same bias against obese men."

The researchers looked at a total of nearly 3,400 men in the years since 2000, when PSA screening became the gold standard test for prostate cancer.

Obese patients whose cancer was diagnosed by PSA testing had more than twice the risk of cancer recurrence after surgery than their normal-weight counterparts, Freedland said. "In contrast, obese men with abnormal digital rectal exams had similar outcomes as normal-weight men," Freedland said.

Another Duke study published in the same issue of the journal provides further substantiation of the concern that obese men have poorer prognoses than normal-weight men. This study showed that obese men have a higher rate of positive surgical margins after surgery to remove the prostate, meaning that there was a higher chance cancer was left behind.

This suggests that prostate cancer surgery is technically more challenging in obese men, making complete tumor removal harder, according to Jayakrishnan Jayachandran, M.D., a urological oncology fellow at Duke and lead investigator on the second study.

"The aggressiveness of obese men's tumors, coupled with the fact that they may be more difficult to remove, is like a double whammy for being obese," Jayachandran said.

"The least we can do is find a way to level the playing field when it comes to diagnostic tools," Freedland said.

PSA screening has been the most common tool used to detect prostate cancer over the past eight to ten years; men are less commonly diagnosed based on digital rectal exam alone.

The researchers are hopeful that this data, coupled with the earlier data on which it builds, may be a catalyst to encourage alternative screening methods for obese men, or a lower threshold for worrisome PSA levels in obese men.

"Obesity is very common in the United States, so this potentially affects a lot of people," Freedland said. "We can't forget that when we use the term obese we are not just talking about very, very large men. A man who is 5 foot 9 and weighs 203 pounds would be considered obese."


Contact: Debbe Geiger
Duke University Medical Center

Related medicine news :

1. Perceived discrimination affects screening rates
2. US Preventive Services Task Force updates prostate cancer screening recommendations
3. New Guidelines Rule Out Prostate Screening for Men Over 75
4. Convenience of screening mammography facilities plays major role in patient retention
5. Higher HIV infection estimate shows need for routine screening, more funding for care
6. American Kidney Fund Launches Screening Program in New York City
7. 2 different breast cancer screening strategies are equally effective
8. 2 Breast Cancer Screening Strategies Prove Effective
9. The Quantum Group Announces Exclusive Screening of New PWeR(TM) System
10. Colon Cancer Screening Rates Remain Low
11. New Law Signed by Governor Rendell Expands Newborn Screening in Pennsylvania
Post Your Comments:
(Date:11/25/2015)... ... November 25, 2015 , ... “While riding the bus, I ... Bronx, N.Y. “I thought there had to be a convenient and comfortable way to ... The PROTECTOR enables disabled individuals to safely travel during cold or inclement weather. In ...
(Date:11/25/2015)... , ... November 25, 2015 , ... ... (PHA) announces the nation’s Periwinkle Pioneers, individuals and groups responsible for advancing care ... disease. The Periwinkle Pioneers, nominated by the public, will receive special recognition throughout ...
(Date:11/25/2015)... ... November 25, 2015 , ... ... philanthropic seniors, is resulting in a way for homeless people to have a ... have launched a new initiative whereby they are repurposing plastic bags into sleeping ...
(Date:11/25/2015)... ... November 25, 2015 , ... Since its launch in 2012, ... adult stem cell therapies to patients with chronic degenerative medical conditions. Now, the ... Registered Trademark (RTM). , Organizations are required to hold a registered trademark in ...
(Date:11/24/2015)... ... November 25, 2015 , ... Genesis Chiropractic Software ... software creates an agreement between the practice owner and the patient that automatically ... notification, and projections. Click here to learn more. , ...
Breaking Medicine News(10 mins):
(Date:11/24/2015)... FRANCISCO , Nov. 24, 2015  Thanks to ... Dignity Health St. Mary,s Medical Center,s Sister Diane Grassilli ... breast imaging capabilities in San Francisco ... an anonymous friend, stepped forward with a gift of ... for Breast Digital Mammography with Tomosynthesis and Whole Breast ...
(Date:11/24/2015)... Colo. , Nov. 24, 2015  Array ... that its Chief Executive Officer, Ron Squarer ... Healthcare Conference in New York.  The public is ... webcast on the Array BioPharma website.Event:Piper Jaffray Annual ... , Wednesday, December 2, 2015Time:1:30 p.m. Eastern Time ...
(Date:11/24/2015)... HOUSTON, TX and VANCOUVER, Nov. 24, 2015 /PRNewswire/ ... EPI; NASDAQ: EPIX ) announced today that the ... clinical study of EPI-506 as a treatment for metastatic ... States and Canada.  --> ... --> In the Phase 1/2 clinical trial, ...
Breaking Medicine Technology: