Relationship between IC50 values for pemetrexed (MTA) and ABCC11 gene expression in 13 lung adenocarcinoma cell lines. Each symbol refers to the genotype of ABCC11. Closed circle (•), 538G/G; closed square (), 538G/A; closed triangle (), 538A/A. No significant correlation was observed between the ABCC11 gene expression levels and MTA sensitivity (n = 13, r = 0.2418, P = 0.4262).