XRCC1 and cancer: We selected data for lung (522 samples, Table S2) and liver (422 samples, Table S3) cancers in which the differences between ALDH2 and XRCC1 mRNA levels were pronounced (Figs. 3A and 4A) and compared these data to oesophageal cancer (186 samples, Table S4) in which XRCC1 and ALDH2 mRNA levels were very close (Fig. 5A).