REV1 and cancer: As for the correlation between REV1 expression and prognosis, our study suggests that low REV1 expression is associated with better prognosis in colorectal (DSS, DFS), gastric (OS, PPS) and ovarian (OS, PPS) cancer while high REV1 expression is associated with better prognosis in lung (OS, RFS, FP, PPS) and breast (DSS, RFS) cancer.