FOXA2, LMX1A, MSX1, TH, TUJ1 (ICC); DAT, EN1, FOXA2, GIRK2, LMX1A, NURR1, OTX2, PITX3, TH, TUJ1 (qRT-PCR). The gene discussed is PITX3; the disease is intrahepatic cholangiocarcinoma.