Is there evidence to suggest that clomiphene can increase risk of prostate or testicular cancer?

No: Clomiphene is a hormone that works similarly to estrogen, and is used for infertility to induce ovulation, among other uses. Prostate cancer, the most common cancer in males--reaching about 90% at age 90, is commonly treated with estrogen-type therapy. Testicular ca is rare and occurs in males 20-35 yrs old (guys check regularly). Am not aware of any good evidence of increased risk of any cancers.

Clomid (clomiphene): Clomiphene is a fertility drug, and a very old one, that should not be taken by men, but also would afford no risk of either prostate or testicular cancer if used by partner or ingested by mistake, .