Bridging therapy effectiveness in the treatment of hepatocellular carcinoma prior to orthotopic liver transplantation.

Abstract

401 Background: Orthotopic liver transplantation (OLT) is the only curative intervention for both hepatocellular carcinoma (HCC) and underlying cirrhosis. OLT is limited by both donor organ shortages and long waitlists for transplant. In order to halt tumor progression, various bridging therapies (BT) have been utilized. Despite complete radiologic responses following BT, viable tumor is often present on explant analysis. We present an update of our experience and include novel bridging modalities. Methods: 35 patients were retrospectively evaluated in a transplant center prior to OLT for HCC. A total of 68 locoregional therapies were utilized. Success of BT was assessed by radiologic response and histopathological examination of the explanted livers. Results: 61 nodules were studied in liver explants. Pre-transplant treatments included: TACE, alcohol ablation (ETOH), radiofrequency ablation (RFA), microwave ablation, selective internal radiation therapy (SIRT) and stereotactic body radiation therapy (SBRT). Radiologically, 36 nodules (59 %) achieved complete response compared to 20 nodules (33%) on explant analysis. Approximately 1/3 of treated nodules with complete tumor necrosis (CTN) were treated with TACE + RFA. 60% of nodules (12/20) with CTN were treated with more than one bridging modality. 75% of nodules (3/4) treated with SIRT alone showed CTN. Patients underwent a mean of 2.2 BT. Four out of 35 (11%) patients had no residual HCC on explant analysis. Conclusions: Although favorable radiologic responses are seen following BT, viable HCC is often seen in liver explants. Newer strategies like SIRT may enhance locoregional control and should be explored as part of an aggressive approach for patients awaiting transplant. [Table: see text]