APOBEC3B and neoplasm: A significant and positive correlation of gene expression was found between UNG and APOBEC3B in both tumor subtypes (LAS: R = 0.35, P = 4.75e-04, and FDR = 5.23e-03; HAS: R = 0.46, P = 8.52e-06, and FDR = 9.37e-05), but not between UNG and APOBEC3A (LAS: R = − 0.042, P = 0.68 and FDR = 1; HAS: R = 0.088, P = 0.42 and FDR = 1; Fig. 2c; FDR correction based on the 32 tested genes in the BER pathway).