KRAS and non-small cell lung carcinoma: Among the twelve MTX salts, three of them, [C12mim]2[MTX], [C10mim]2[MTX] and [C10-3-picoline]2[MTX], showed an antiproliferative effect in the KRAS-mutated A549 NSCLC cell line compared to the EGFR-mutated NSCLC cell line H1975.