From a US health siteUS health site
"Q: Can penile cancer be prevented?
A: Although there is no definite way to prevent penile cancer, there are some risk factors a man can avoid. In the past, it was thought that circumcision could help prevent penile cancer. This is not true. Here are some actual ways to help prevent penile cancer."
American Cancer SocietyACS
Letter from America Cancer Society to all doctors. Claiming circumcision prevents cancer can get you sued.letter
"Research suggesting a pattern in the circumcision status of partners of women with cervical cancer is methodologically flawed, outdated, and has not been taken seriously in the medical community for decades.
Likewise, research claiming a relationship between circumcision and penile cancer is inconclusive. Penile cancer is an extremely rare condition, affecting one in 200,000 men in the United States. Penile cancer rates in countries which do not practice circumcision are lower than those found in the United States."