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Marijuana smoking tied to testicular cancer: study

Young men who had smoked marijuana recreationally were twice as likely to be diagnosed with testicular cancer than men who have never used marijuana, according to a U.S. study.
Researchers whose findings appeared in the journal Cancer said the link appeared to be specific to a type of tumor known as nonseminoma.
"This is the third study consistently demonstrating a greater than doubling of risk of this particularly undesirable subtype of testicular cancer among young men with marijuana use," said Victoria Cortessis of the University of Southern California, Los Angeles, who led the study.
"I myself feel like we need to take this seriously now," she added, noting that the rates of testicular cancer have been rising inexplicably over the past century.
The research isn't ironclad proof that the marijuana is to blame, and even if it is, the danger isn't overwhelming. According to the American Cancer Society, a man's lifetime risk of getting testicular cancer is about one in 270 - and because effective treatment is available, the risk of dying from the disease is just one in 5,000.
So far, little is known about what causes it. Cortessis said undescended testicles, in which the testes remain in the abdomen beyond the age of a year, are a risk factor. Both pesticide and hormone exposure have also been associated with the tumors.
Cortessis and her colleagues used data from 163 young men who had been diagnosed with testicular cancer and nearly 300 men in a comparison group without the disease. Both groups had been interviewed about their health and drug use between 1987 and 1994.
Among the men with cancer, 81 percent had used marijuana at some point, whereas that was the case for 70 percent of the comparison group.
By contrast, cocaine use was linked to a smaller risk of the tumors. That's important because it signals that men who have been diagnosed with cancer aren't just more honest about their drug use, thereby creating a spurious link between marijuana and cancer, Cortessis said.
It's not entirely clear how marijuana would influence men's cancer risk, but Cortessis said developing testicles may somehow respond to the drug's main active ingredient.

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