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generally been classified as high-or low-incidence areas, the racial/ethnic distribution of NPC within regions is far from uniform (Chang and Adami, 2006). In the southeastern Chinese province of Guangdong, where the overall NPC incidence rate is >20 per 100,000 personyears among males, rates in Cantonese speakers are double those in other dialect groups such as the Hakka, Hokkien, and Chiu Chau (Parkin et al., 2002;Chang and Adami, 2006). Likewise, in the Malaysian state of Selangor, rates in Chinese residents have historically been highest among Cantonese, intermediate among Khek, and lowest among Hokkien and Teochiu (Parkin et al.