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In this new study, a team at the U.S. National Cancer Institute analyzed 1978 to 2005 data from 16 cancer registries and found that the incidence rate for these types of cancers was 5.1 cases per 1 million people. Men were more likely than women to develop one of the cancers. Whites had higher rates than Hispanics, blacks and Asian/Pacific Islanders. The most common type was cancer of the sweat glands (apocrine-eccrine carcinoma).