Navigation Links
Hair-growth drug artificially lowers PSA levels in prostate cancer screening, study finds

The popular hair-growth drug finasteride, taken by millions of balding men, artificially lowers the results of the prostate-specific antigen (PSA) test, the standard screening test for prostate cancer, a multicenter study has found.

The study, involving 308 men ranging in age from 40 to 60 years old, is available online in the British medical journal The Lancet and is scheduled to be published after Jan. 1, 2007. The study calls for new clinical guidelines for primary-care physicians, dermatologists and urologists to account for the role of finasteride, known as Propecia when used for hair loss, while evaluating PSA results.

"It's not universally known that finasteride lowers PSA levels in younger men who take it for hair growth," said Dr. Claus Roehrborn, chairman of urology at UT Southwestern Medical Center and co-principal investigator of The Lancet study, along with Dr. Anthony D'Amico of Brigham and Women's Hospital and Dana-Farber Cancer Institute in Boston. "It is important for physicians to know that many young men take Propecia and that their PSA level is lowered artificially. Doctors need to adjust the PSA interpretation by multiplying it times two for these men."

Finasteride was initially developed in the 1990s for the treatment of benign prostatic hyperplasia (BPH), better known as enlarged-prostate disease, and was first approved by the U.S. Food and Drug Administration for this use. Patients with BPH must strain to pass urine and feel the urge to urinate frequently. BPH can lead to the inability to urinate and urinary tract infection.

In 1997 the FDA approved finasteride for the treatment of male-pattern baldness. While Propecia is administered at 1 milligram per day, patients who take the finasteride drug Proscar for BPH get a five times higher dosage, 5 mg per day. "The impact of finasteride on PSA levels is significant," said Dr. Roehrborn. "This needs to be realized by all internists, family-care doctors, dermato logists ?anybody who writes prescriptions for male-pattern hair loss."

Researchers have known for years that the same testosterone metabolism responsible for prostate growth also causes male-pattern baldness (called androgenic alopecia), Dr. Roehrborn said. Both BPH and male-pattern hair loss have to do with the male hormone testosterone, which is being converted to dihydrotestosterone (DHT) by an enzyme named 5-alpha reductase. DHT activates the genes responsible for the development of male-pattern hair loss. Finasteride interferes with this process by blocking 5-alpha reductase and preventing the conversion of testosterone to DHT.

The data in The Lancet study were collected by Dr. Roehrborn from 1998 to 2000 in cooperation with medical centers in Arizona, Colorado, Connecticut, Georgia, Indiana, Louisiana, Minnesota, New York, North Carolina, Oregon, Texas and Virginia.

The data in The Lancet study are derived from a study Dr. Roehrborn conducted with Merck & Co., Inc. in 2000. Dr. Roehrborn, discussing the reasons to publish this report now, said: "The data are published now out of recognition that there was an acknowledged gap in the primary-care community about the impact of Propecia on PSA levels. When doctors ask for their patients' medical history, they need to ask if they have taken any drugs for hair loss, and the doctors need to multiply the PSA readings by two."


Source:UT Southwestern Medical Center

Related biology news :

1. Stimulation of the semicircular canals can artificially control human walking and balance
2. Bacteria could make new library of cancer drugs that are too complex to create artificially
3. Medical whistleblowers speak out
4. Bumblebees copy one another when contending with unfamiliar flowers
5. Reducing antibiotic use lowers rates of drug-resistant bacteria
6. Recreating Flowers for Algernon with a happy ending
7. AIDS drug from sunflowers
8. How nice, brown rice: Study shows rice bran lowers blood pressure in rats
9. Wild bees and the flowers they pollinate are disappearing together
10. Genetic snooze button governs timing of spring flowers
11. How did bilaterally symmetric flowers evolve from radially symmetric ones?
Post Your Comments:

(Date:11/9/2015)... ) ... "Global Law Enforcement Biometrics Market 2015-2019" ... ) has announced the addition of ... 2015-2019" report to their offering. ... ) has announced the addition of the ...
(Date:11/2/2015)... Calif. , Nov. 2, 2015  SRI International ... million to provide preclinical development services to the National ... contract, SRI will provide scientific expertise, modern testing and ... variety of preclinical pharmacology and toxicology studies to evaluate ... --> The PREVENT Cancer Drug Development Program ...
(Date:10/29/2015)... , Oct. 29, 2015 Daon, a ... that it has released a new version of its ... in North America have already ... v4.0 also includes a FIDO UAF certified server ... already preparing to activate FIDO features. These customers include ...
Breaking Biology News(10 mins):
(Date:11/26/2015)... 26, 2015 --> ... in imaging technologies, announced today that it has received a ... the Horizon 2020 European Union Framework Programme for Research and ... trial in breast cancer. , --> ... --> --> The study aims to ...
(Date:11/25/2015)... 2015 Studies reveal the differences ... and pave the way for more effective treatment for one ...   --> --> ... problems in cats, yet relatively little was understood about the ... have been conducted by researchers from the WALTHAM Centre for ...
(Date:11/25/2015)... ... 25, 2015 , ... A long-standing partnership between the Academy ... been formalized with the signing of a Memorandum of Understanding. , AMA Executive ... Karl Minter and Capt. Albert Glenn Tuesday, November 24, 2015, at AMA Headquarters ...
(Date:11/24/2015)... LUMPUR, Malaysia , Nov. 24, 2015 /PRNewswire/ ... global contract research organisation (CRO) market. The trend ... result in lower margins but higher volume share ... increased capacity and scale, however, margins in the ... Research Organisation (CRO) Market ( ), ...
Breaking Biology Technology: