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Cancer Inequalities in Japan

Cancer death has been Japan’s greatest public health enemy since the 1980s, after controlling infectious diseases, such as tuberculosis. Improvement in cancer survival due to the development of effective cancer treatment and the spread of screening for early detection of cancer has led to declining trends in cancer mortality. However, inequalities in cancer outcome have been observed and trends in inequalities for some cancers have widened in Japan. Socioeconomic inequalities in cancer can be partly explained by differences in the prevalence of cancer risks and screening uptakes. Issues of access to treatment and diagnostic differences still need clarification due to the lack of data in Japan. We need to understand the mechanisms of inequalities in cancer occurrence, detection, and treatment to deal with this barrier to cancer control.