(2012) reported ATL incidence in the selected 15 population-based cancer registries with high-quality data in Japan, by dividing them into 12 “HTLV-1 non-endemic areas” and three “HTLV-1 endemic areas.” After analyzing 1,380 patients in the non-endemic areas and 2,055 patients in the endemic areas who were diagnosed in 1993–2006, they reported that the age-standardized incidence rate of ATL showed an increasing trend in the HTLV-1 non-endemic areas but was stable in the HTLV-1-endemic areas.
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