Other antigens, including HER2, CD133, glypican-3 (GPC3), mesothelin, integrin αvβ6 [112], glypican-1, PSMA, and WT1 are also being investigated for their potential as therapeutic targets or markers for CCA [60,61,65,83,86,87,88,93,94,95,96,97,98,99,113,114,115,116,117,118]. The gene discussed is PROM1; the disease is cholangiocarcinoma.