Tanaka and colleagues report on the contribution of hepatitis C virus (HCV)–related hepatocellular carcinoma (HCC) to changes
in HCC incidence in Osaka, Japan. Between 1981 and 2003, incidence of HCC among men age 50 to 59 years, 60 to 69 years, and
70 to 79 years peaked in 1986, 1995, and 2000, respectively, with marked downward trends thereafter. Trends were similar in
women. The rates of HCV-associated HCC decreased, but those of HCC unrelated to HCV did not change, suggesting that the decrease
in HCC rates is related to the decreasing incidence of HCV.