APEX2 and neoplasm: After establishing differential expression patterns for reach gene per cancer types, FPKM values of APE2 were correlated with 13 other DNA repair and DDR genes in tumor tissue only for breast (n = 1,105), lung (n = 1,028), kidney (n = 891), uterine (n = 552), prostate (n = 499), and liver (n = 407) cancers (Tables S3 and S5).