Phase 2 Evaluation of Neoadjuvant Intensity-Modulated Radiotherapy in Centrally Located Hepatocellular Carcinoma

Importance: Centrally located hepatocellular carcinoma (HCC) is a special type of HCC whose outcome is unsatisfactory when treated with surgery alone. No standard adjuvant or neoadjuvant treatment for this disease has been established that improves clinical outcomes. Objective: To evaluate the effectiveness and safety of adding neoadjuvant intensity-modulated radiotherapy (IMRT) before surgery in patients with centrally located HCC. Design, Setting, and Participants: This phase 2, single-center, single-group prospective nonrandomized controlled trial was conducted between December 16, 2014, and January 29, 2019, at the Cancer Institute and Hospital of the Chinese Academy of Medical Sciences in Beijing, China. The last follow-up was on July 30, 2021. Patients with centrally located HCC who underwent neoadjuvant IMRT and surgery were included in the analysis. Interventions: Neoadjuvant IMRT followed by hepatectomy. Main Outcomes and Measures: The primary end point was 5-year overall survival (OS). The secondary end points were tumor response to IMRT, 5-year disease-free survival (DFS), and treatment-related adverse events. Results: Thirty-eight patients (mean [SD] age, 55.6 [9.3] years; 35 male [92.1%] individuals) completed the prescribed neoadjuvant IMRT without interruption. Radiographic tumor response to IMRT before surgery included partial response (16 [42.1%]) and stable disease (22 [57.9%]). Thirteen patients (34.2%) achieved major pathological response, of which 5 (13.2%) achieved pathologic complete response. With a median follow-up of 45.8 months, the median OS was not reached, and the OS rates were 94.6% at 1 year, 75.4% at 3 years, and 69.1% at 5 years. The median DFS was 45.8 months, and DFS rates were 70.3% at 1 year, 54.1% at 3 years, and 41.0% at 5 years. Radiotherapy-related grade 3 adverse events were observed in 3 patients (7.9%). Nineteen operative complications developed in 13 patients (34.2%), including grade I to II complications in 12 patients (31.6%) and grade IIIa complication in 1 patient (2.6%). No grade IIIb or higher operative complications were observed. Conclusions and Relevance: Results of this trial suggest that neoadjuvant IMRT plus surgery is effective and well-tolerated in patients with centrally located HCC. These data may inform a future randomized clinical trial of this new treatment strategy. Trial Registration: ClinicalTrials.gov Identifier: NCT02580929.