Final answer:
Testosterone stimulates prostate growth and can enhance prostate cancer growth. In contrast, estrogen may be used in treatment as it can block testosterone effects.
Step-by-step explanation:
The hormone that stimulates prostate growth and is associated with the development of prostate cancer is testosterone. Testosterone, the most widely known androgen in males, promotes the growth of the prostate as well as the development of masculine characteristics. In the context of cancer, testosterone enhances prostate cancer growth. Correspondingly, treatments for prostate cancer sometimes involve the administration of estrogens to block the release and activity of testosterone, because estrogens can act as an antagonist to testosterone in this scenario.