The prostate specific antigen (PSA) cancer screening test is falsely lowered by a factor of two in middle-aged men who have taken popular hair loss drug Propecia, according to Brigham and Women’s Hospital (BWH) research.
“It can reduce the values by 50 percent,” says Claus Roehrborn from the University of Texas Southwestern Medical Center in Dallas, an author of the report.

“So a man in his 50s, taking this lifestyle drug, might get a result of 2, when it’s really a 4, which is more alarming.” The higher number could indicate a growing cancer.

The research was funded by Merck & Co., Propecia’s maker.

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