How is epidemiology of cholangiocarcinomas?

Most common biliary and second most common primary hepatic malignancy. less than 2% of all malignancies, 9th most common GI one (hepatobiliary carcinomas are 13-30% of death, 10% of them are cholangiocarcinomas) 52-54% are male, older than 50 years old usually uncommon before 40 unless pt w/PSC