Association of family history of tumors with clinicopathological characteristics and prognosis of colorectal cancer.

To investigate the association of family history of malignant tumors with clinicopathological characteristics of colorectal cancer, and its effects on prognosis. We conducted a retrospective review of pathological and follow-up data of patients with colorectal cancer treated in our hospital from January 2010 to December 2015. Of 870 patients undergoing surgery, 737 received follow-up (84.7%). Among them, 192 (26.1%) were family history of malignant neoplasm-positive [MN-FH (+)] and 545 (73.9%) were family history of malignant neoplasm-negative [MN-FH (-)]. MN-FH (+) patients had earlier disease onset, smaller tumor diameter, lower rate of lymph node metastasis, and lower depth of invasion. There were significant differences in BMI between the groups (P<0.05) but no differences in sex or tumor differentiation grade (P>0.05). Rates of Her-2 and p53 protein expression in MN-FH (+) patients were 34.3 and 40.5%, respectively, compared with 22.2 and 26.3% in MN-FH (-) patients. In stage 3, significantly higher Her-2 and p53 protein expression rates were observed in MN-FH (+) than in MN-FH (-) patients. Fluorescence in-situ hybridization showed significantly higher Her-2 expression in MN-FH (+) than in MN-FH (-) patients. The 3 and 5-year overall survival, disease-free survival, and progression-free survival were significantly lower in MN-FH (+) than in MN-FH (-) patients (P<0.05). MN-FH (+) patients with colorectal cancer had earlier disease onset and smaller tumor area, lower invasion depth, a lower rate of lymph node metastasis, and earlier TNM tumor stage at diagnosis than MN-FH (-) patients. BMI value distribution significantly differed between groups. However, long-term prognosis was worse for MN-FH (+) than MN-FH (-) patients, suggesting that internal pathogenic genes play a more crucial role than external environmental factors in prognosis. Family history of tumors could be an independent prognostic factor for colon cancer.