Increased IFN-β indicates better survival in hepatocellular carcinoma treated with radiotherapy.

Preclinical data suggest that type I interferon (IFN) responsiveness is essential for the antitumor effects of radiotherapy (RT). However, its clinical value remains unclear. This study aimed to explore this from a clinical perspective. In cohort 1, data from 152 hepatocellular carcinoma (HCC) patients who received RT were analyzed. Blood samples were taken 1 day before and 2 weeks after RT. RT was found to increase serum levels of IFN-β (a subtype of IFN-I) in HCC patients (3.42†±†1.57 to 5.51†±†2.11 pg/ml, P†<†0.01), particularly in those with favorable responses. Higher post-RT serum IFN-β levels (≥4.77 pg/ml) were associated with better progression-free survival (HR†=†0.58, P†<†0.01). Cohort 2 included 46 HCC patients, including 23 who underwent preoperative RT and 23 matched control HCC who received surgical resection without RT. Formalin-fixed paraffin-embedded samples were obtained. Neoadjuvant RT significantly increased IFN-β expression in tumor tissues compared to direct surgery (8.13%†±†5.19% to 15.10%†±†5.89%, P†<†0.01). Higher post-RT IFN-β (>median) indicated better disease-free survival (P†=†0.049). Additionally, increased CD11c+MHCII+CD141+ antigen-presenting cell subsets and CD103+CD39+CD8+ tumor-infiltrating lymphocytes were found in the higher IFN-β group (P†=†0.02, P†=†0.03), which may contribute to the favorable prognosis in higher IFN-β group. Collectively, these findings suggest that IFN-β response activated by radiation may serve as a prognostic biomarker for HCC patients undergoing RT.