Influence of type 2 diabetes mellitus on Khorana venous thromboembolism risk in colorectal cancer patients.

Background: Many studies have documented the association between venous thromboembolism (VTE) and colorectal cancer (CRC). The Khorana model is a VTE risk assessment model for predicting cancer-associated thrombosis. Type 2 diabetes (T2DM) has also been reported to increase the risk of VTE. Purpose: The aim of this study was to investigate the influence of T2DM on Khorana VTE risk in CRC patients and to explore the relationship between Khorana VTE category and CRC clinicopathological factors. Methods: This analysis included 615 CRC patients (205 with T2DM). Fibrinogen and D-dimer levels were compared within each group. A comparison was made of the proportion of patients in different Khorana VTE risk categories in CRC patients with and without T2DM. The association between Khorana VTE risk category and clinicopathological factors among all the CRC patients was evaluated. Results: Fibrinogen levels of CRC patients with T2DM were significantly higher than those of non-diabetes patients (4.13 +/- 1.06 vs 3.94 +/- 0.98, p < 0.001). A higher proportion of CRC patients with T2DM were in the Khorana intermediate-to-high risk category (H = 4.749, p = 0.029). Female sex, diabetes, colon location (compared with rectum), larger tumor size, advanced pT stage and pN stage were correlated with the intermediate-to-high Khorana VTE risk category, with odd ratios (95% confidence intervals [CI]) of 1.537 (1.064-2.220), 1.499 (1.027-2.186), 2.313 (1.588-3.370), 2.284 (1.542-3.383), 4.429 (2.088-9.396) and 1.822 (1.230-2.698), respectively. Conclusion: T2DM increases Khorana VTE risk in CRC patients. Female sex, diabetes, colon location, large tumor size and poor stage are associated with the intermediate-to-high Khorana VTE risk category.