Scientists from the German Cancer Research Center (Deutsches Krebsforschungszentrum, DKFZ) and the Hebrew University in Jerusalem have identified in mice the cell of origin of combined liver/biliary duct carcinomas, a rare type of cancer of the liver. The pro-inflammatory immune messenger interleukin 6 (IL-6) was found to be the driver of carcinogenesis. Blocking of IL-6 reduced both the number and size of tumors in mice.