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According to recent research at Lancet oncology, propecia lowers PSA-value for about 40-50%. This means that if you suspect prostatic cancer and you take propecia, you must remember to mention this to your doctor. He will then multiply you PSA-value by two to get your real PSA-value ( a method commonly used in patients treated for prostatic cancer with 5mg finasteride ).
"FINDINGS: Within 48 weeks of randomisation, men aged 40-49 years and 50-60 years who were assigned 1 mg/day finasteride had a median decrease in serum PSA concentration of 40% (95% CI 34-46) and 50% (44-57), respectively. In men assigned placebo, the median changes were 0% [-14 to 14] and a median increase of 13% [2 to 24], respectively."
"INTERPRETATION: In men aged 40-60 years, 1 mg/day finasteride for 48 weeks lowers serum PSA concentration. Therefore, the existing recommendation for the adjustment of serum PSA concentration in prostate-cancer screening in men taking 5 mg/day finasteride should also apply to men taking the 1 mg/day preparation for male-pattern hair loss."
Lancet Oncol. 2007 Jan;8(1):21-5.
"FINDINGS: Within 48 weeks of randomisation, men aged 40-49 years and 50-60 years who were assigned 1 mg/day finasteride had a median decrease in serum PSA concentration of 40% (95% CI 34-46) and 50% (44-57), respectively. In men assigned placebo, the median changes were 0% [-14 to 14] and a median increase of 13% [2 to 24], respectively."
"INTERPRETATION: In men aged 40-60 years, 1 mg/day finasteride for 48 weeks lowers serum PSA concentration. Therefore, the existing recommendation for the adjustment of serum PSA concentration in prostate-cancer screening in men taking 5 mg/day finasteride should also apply to men taking the 1 mg/day preparation for male-pattern hair loss."
Lancet Oncol. 2007 Jan;8(1):21-5.
