Identifying patients with prostate cancer at increased risk for haematuria during anticoagulation for venous thromboembolism.

ABSTRACT

BACKGROUND: Haematuria is a common complication in prostate cancer patients receiving anticoagulation for venous thromboembolism (VTE). Early identification of at-risk patients might help to reduce its incidence and severity. METHODS: We used data from the RIETE registry to develop a prognostic score for haematuria during the first year of anticoagulation for VTE. The prognostic score was built using regression coefficients. RESULTS: From March 2001 through March 2021, 1934 patients with prostate cancer and acute VTE were enrolled. Of these, 1034 (53 %) initially presented as pulmonary embolism and 900 (47 %) as isolated deep vein thrombosis (DVT). During anticoagulation (median 181 days; inter-quartile range 97-354), 99 patients (5.1 %) developed haematuria (fatal 1, major 27, non-major 72). The incidence rate was 8 events per 100 patient-years (95%CI 6.5-9.7). Median time to haematuria was 53 days (IQR 4-134). On multivariable analysis, recent haematuria, initial presentation as DVT, comorbidity, metastases, haemoglobin levels <11 g/dL, creatinine >1.2 mg/dL, and radiotherapy independently predicted the risk for haematuria. C-statistics was 0.71 (95%CI 0.65-0.77). A cut-off of ≥1.5 points classified 312 patients (20 %) at high-risk and had the highest sensitivity (51 %; 95%CI 39-62) and specificity (82 %; 95%CI 79-83). Our score improved the performance and non-event net reclassification index (NRI) of the RIETE score (c-statistics 0.61; 95%CI 0.54-0.68; NRI 0.09) or VTE-BLEED score (c-statistics 0.64; 95%CI 0.58-0.71; NRI 0.76). CONCLUSIONS: A prognostic score for haematuria during anticoagulation for VTE performed well in patients with prostate cancer, and improved identification compared to other validated scores.