Of the 74 patients receiving Bmab-containing CTx, UACVP-related complications occurred in 22 patients (28.9 %, 0.29/1000 catheter days), including nine cases of UACVP-related infections (seven catheter infection and two port pocket infection) (12.2 %, 0.12/1000 catheter days), three cases of venous thrombosis (4.1 %, 0.04/1000 catheter days) and four cases of catheter occlusion (5.4 %, 0.052/1000 catheter days). The gene discussed is CYP27A1; the disease is Venous thrombosis.