呃...大家擔心的是性欲降低或是不舉，怎麼你擔心的是癌症？
癌症方面其實不需要擔心說：

New Update On Prostate Cancer Prevention With Finasteride Creates A Dilemma For Patients

1) With 18,880 men in the trial, fewer men treated with finasteride developed prostate cancer over the nearly two decades than those who got a placebo (10.5% v. 14.9%) (all men received regular screening using PSA)

2) Of those who did develop prostate cancer, 3.5% of those taking finasteride had high grade disease compared to 3.0% of the men in the control (untreated) group

3) Almost equal percentages of men in both groups died, implying that finasteride had no impact on overall mortality, even though it decreased the number of prostate cancers diagnosed and despite the fact that more of those cancers in men treated with finasteride were higher grades with supposedly worse prognoses

4) 10 year survival rates for treated and untreated patients with both low and high grade prostate cancers did not differ meaningfully.