In order to investigate the effect of PMS2 gene on the migration ability of lung cancer cells, we screened lung cancer cell lines by PCR (Fig. 2A) and western blotting (Fig. 2B, Supplement Fig. 3A) and we found PC9 lung cancer cell lines with consistently low PMS2 expressed in at the transcriptional and protein levels. Here, PMS2 is linked to lung carcinoma.