Abstract: Objective To screen the risk factors of liver metastasis in patients with postoperative colorectal cancer and to set up a mathematic model. Methods  One hundred and sixty-eight patients received radical surgery were retrospectively analyzed. Logistics model regression was used to identify the risk factors and ROC test to complete a mathematic model. Results The 3 and 5-year incidence rate of liver metastasis was 25.0% and 33.3%, respectively. The risk factors of liver metastasis were lymph node metastasis (LNM), tumor invasive depth (TID), histological grading (G) and preoperative serum tumor markers (PSM). The mathematic model was: logit (P)=-0.931+0.973×LNM+0.302×TID+0.637×G+0.042×PSM. Conclusion The risk factors of liver metastasis were LNM, TID, G and PSM, and the mathematic model could be set up.

Key words: Colorectal neoplasms, Neoplasm metastasis, Liver, Risk factors