The Epidemiology of Cholangiocarcinoma

The incidence rates of cholangiocarcinoma (CC) vary greatly among different areas of the world, and this variation is related to distribution of risk factors. Intrahepatic cholangiocarcinoma (ICC) and extrahepatic cholangiocarcinoma (ECC) have different epidemiological features. Recent data show that the incidence and mortality rates of ICC have been increasing in several areas around the world. On the other hand, the incidence and mortality rates of ECC have been decreasing. For example, in the United States, the age-adjusted incidence rates of ICC increased by 165% from 0.32 per 100,000 in 1975 to 1979 to 0.85 per 100,000 in 1995 to 1999, whereas ECC declined by 14%. In the meantime, there has been very…