Role of nonneoplastic PVT in the natural history of patients with cirrhosis and first diagnosis of HCC

Background and Aims: HCC can increase the risk of nonneoplastic PVT in cirrhosis. However, the natural history of PVT and its prognostic role in HCC patients are unknown.Approach and Results: Consecutive HCC patients with cirrhosis undergoing laparoscopic ablation were retrospectively evaluated and followed up to 36 months. HCC and PVT characteristics and evolution were reviewed. PVT was categorized according to lumen occupancy (<= 50%, >50% <100%, and = 100%) and extension to other veins. The evolution of thrombosis was considered at 1 year from diagnosis. Variables associated with the presence of PVT and evolution patterns were analyzed, as well as their impact on survival. In all, 750 patients were included, 88 of whom had PVT. On multivariate analysis, the occurrence of PVT at HCC diagnosis was associated with pretreatment total tumor volume (p < 0.001) and clinically significant portal hypertension (p = 0.005). During the follow-up, 46 de novo PVT occurred, 27/46 (58.7%) in the presence of a viable tumor. Among 115 PVT diagnosed in the presence of HCC, 83 had available radiological follow-up, and 22 were anticoagulated. The "complete/progressive" evolution pattern was associated with nonresponse to HCC treatment in non-anticoagulated patients. The presence of PVT was independently associated with lower overall survival, particularly when progressive or occlusive (p < 0.001). A higher competing risk of death emerged for "complete and progressive" PVT, both for HCC-related (p < 0.001) and non-HCC-related (p = 0.002) death.Conclusions: HCC represents an independent risk factor for the occurrence and progression of PVT in cirrhosis. Since progressive and occlusive PVT seems to be an independent factor associated with mortality, screening and prompt treatment of this complication should be considered.