IL6 and cholangiocarcinoma: The IL-6 concentrations in plasma for both cases and controls ranged between <0.01 pg/mL (undetectable) and 538.6 pg/ml, with a much wider range in APF cases (<0.01 to 538.6 pg/ml) and CCA cases (<0.01 to 536.2 pg/ml) than APF- controls (<0.01 to 173.1 pg/ml).