PROM1 and cholangiocarcinoma: In inflamed livers of CCA patients infected by Opistorchis viverrini, Kawanishi et al. found several OV6+/CD133+ progenitor/stem cells harboring high levels of 8-oxodG (8-oxo-7,8-dihydro-2′-deoxyguanosine), a marker of free-radical-induced DNA damage.