TF and adenocarcinoma: Methods: The adenocarcinoma cells were obtained from patients after a pathological confirmation, then they were cultured in DMEM environment and cytotoxic effect of different concentrations of cerium were measured (0.1, 1, 10 and 100 μM) in the presence and absence of transferrin, on periods 24 and 48 hours by MTT and LDH cytotoxic assay.