In ESCC cell lines (TE2, TE13) Tanaka et al (2010), in their analysis of the intracellular localisation of CDDP by using in-air micro-particle induced X-ray emission, recently reported that TE2 cells, which express lower MRP2 than TE13, had higher intracellular CDDP concentrations and sensitivity than TE13 cells. Here, ABCC2 is linked to esophageal squamous cell carcinoma.