Postoperative survival probabilities (all-cause mortality) for patients with endometrial cancer who did and did not develop venous thromboembolism (VTE). At 12 months postoperatively, the survival probability for patients developing VTE was 84%; it was 95% for patients not developing a VTE. At 24 months postoperatively, the rates were 58% and 92%. The overall postoperative death rate (all-cause mortality) for patients with endometrial cancer who experienced a thrombotic complication was 42% (11 of 26); the death rate was 9% for patients who did not develop a VTE (36 of 396). The risk for death in the VTE group was thus almost 5 times that in the no-VTE group: hazard ratio, 5.63; 95% confidence interval, 2.86 to 11.08; p < 0.0001. In our analysis, 12% of VTE events (3 of 26) occurred by postoperative day 30, and 50% (13 of 26) occurred by postoperative day 180.