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World data shows that prostate cancer is quite prevalent in countries where [[circumcision]] is common, if not near-universal. Incidence of prostate cancer is also quite low in many countries where circumcision is not a common practice, if extremely rare. Whereas 80% of men are [[circumcised]] from birth in the [[United States]], circumcision is rare in countries in South America. In this map, one can see that incidence of prostate cancer is estimated to be higher in the US, where circumcision is common, than in its neighbors to the south, where circumcision is rare. It is also estimated to be much lower in various countries in Asia where [[circumcision ]] is not a common practice, such as Japan, [[China]], Thailand and others.