A study from a group of researchers at the University of Illinois in Chicago suggests testosterone replacement therapy (TRT) such as implants and injections, can increase the risk of developing prostate cancer, which is known to affect 1 out of 7 men and is the second leading cause of cancer-related death.

While a number of risk factors are known such as older age, African-American ethnicity, family history, diet, and obesity, the link between testosterone and prostate cancer is still not established. While testosterone is a weak complete carcinogen, it is a strong tumor promoter in rats.

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