Stereotactic ablative radiation therapy prior to liver transplantation in hepatocellular carcinoma.

OBJECTIVE: Stereotactic ablative radiotherapy (SABR) is a safe treatment approach for hepatocellular carcinoma (HCC) with comparable effectiveness to other local therapies. Only scant information is available concerning the role of SABR prior to liver transplantation (LT) for HCC. We present a consecutive case series investigating the role of SABR as a bridge or downstaging option in HCC patients subsequently submitted to LT.

MATERIALS AND METHODS: Between September 2012 and May 2014, 8 patients for a total of 13 lesions underwent SABR prior to LT. Inclusion criteria were a pathological or radiological diagnosis of HCC, lesion size ≤6 cm or lesion number ≤3 with a total diameter ≤6 cm, no extrahepatic metastases, Child-Pugh class A-B, ECOG performance status ≤1. Patients were prescribed 36-48 Gy in 3-5 fractions (8 Gy × 5 fractions or 16 Gy × 3 fractions), in 3-5 consecutive days according to clinical and dosimetric decision making. Radiological response was evaluated according to the modified Response Evaluation Criteria in Solid Tumors (mRECIST). Pathological response was assessed through the rate of tumor necrosis relative to the total tumor volume. Acute and late toxicities were scored using the National Cancer Institute Common Terminology Criteria for Adverse Events version 4 (CTCAE v 4.0).

RESULTS: Among the 13 pathologically evaluated lesions, 8 (61.5 %) lesions had a complete response 2 (15.3 %) had a minimal pathological response and other 2 (15.3 %) showed stable disease. The remaining lesion had a significant pathological response. Maximum detected toxicity included a G2 GGT increase in two patients (at 1 and 3 months respectively). One patient developed a non-classic RILD with a fivefold increase in transaminase enzymes level and a shift in Child-Pugh category from B7 to C10 due to bilirubin increase. Only one modification in the surgical strategy was needed during LT.

CONCLUSIONS: SABR proved to be a safe and effective local therapy prior to LT in HCC patients. Prospective controlled clinical trials are needed to evaluate its efficacy compared to other local therapies in this setting.