Impact of Duration of Adjuvant Therapy on Patients with Initially Unresectable Hepatocellular Carcinoma After Conversion Surgery: A Propensity Score Matching Study

Zhong-Tai Lin,1,2,* Shao-Ming Wei,1,3,* Jun-Yi Wu,1,3,* Zhi-Bo Zhang,4 Shuang-Jia Wang,5 Jian-Yin Zhou,6 Meng-Chao Luo,1,3 Zhen-Xin Zeng,1 Xiang-Ye Ou,1 Yang-Kai Fu,1 Han Li,1 De-Yi Liu,1 Jia-Yi Wu,1,3 Mao-Lin Yan1,3 1The Shengli Clinical Medical College of Fujian Medical University, Fuzhou, Fujian Province, People’s Republic of China; 2Department of Gastrointestinal Surgery, Fujian Provincial Hospital, Fuzhou, Fujian Province, People’s Republic of China; 3Department of Hepatobiliary Pancreatic Surgery, Fujian Provincial Hospital, Fuzhou, Fujian Province, People’s Republic of China; 4Department of Hepatopancreatobiliary Surgery, First Affiliated Hospital of Fujian Medical University, Fuzhou, Fujian Province, People’s Republic of China; 5Department of Hepato-Biliary-Pancreatic and Vascular Surgery, First Affiliated Hospital of Xiamen University, Xiamen, Fujian Province, People’s Republic of China; 6Department of Hepatobiliary Surgery, Zhongshan Hospital of Xiamen University, Xiamen, Fujian Province, People’s Republic of China*These authors contributed equally to this workCorrespondence: Jia-Yi Wu; Mao-Lin Yan, The Shengli Clinical Medical College of Fujian Medical University, Department of Hepatobiliary Pancreatic Surgery, Fujian Provincial Hospital, Dongjie Road 134, Fuzhou, Fujian Province, 350001, People’s Republic of China, Tel +86 0591-88217140, Fax +86 0591-87557768, Email [email protected]; [email protected]: This study aimed to assess the effect of adjuvant therapy with different durations in patients with initially unresectable hepatocellular carcinoma (uHCC) after conversion surgery.Methods: This study included 85 patients with initially uHCC who received conversion surgery between May 2019 and November 2022. They were divided into the long duration group (n = 57) and short duration group (n = 28) based on postoperative medication duration. Recurrence-free survival (RFS) and overall survival (OS) were analyzed and compared between the cohorts.Results: No significant difference in RFS or OS was found between the two groups [RFS: hazard ratio (HR) = 0.486; 95% confidence interval (CI), 0.229– 1.034, P = 0.061; OS: HR = 0.377; 95% CI, 0.119– 1.196, P = 0.098]. Patients without major pathologic response (MPR) in the long duration group had better RFS and OS results compared to those in the short duration group (RFS: HR = 0.242; 95% CI, 0.092– 0.634, P = 0.004; OS: HR = 0.264; 95% CI, 0.079– 0.882, P = 0.031). No significant difference was detected in RFS or OS between the two groups in patients with MPR (RFS: HR = 1.250; 95% CI, 0.373– 4.183, P = 0.718; OS: HR = 7.389; 95% CI, 0.147– 372.4, P = 0.317). After propensity score matching, 25 pairs of patients were selected and the results remained consistent.Conclusion: At least 6 months of adjuvant therapy may be beneficial for patients without MPR after conversion surgery. However, in patients with MPR, the effect of adjuvant therapy remains unclear. Further studies are needed to confirm the optimal duration of adjuvant therapy.Keywords: unresectable, hepatocellular carcinoma, conversion therapy, adjuvant therapy, recurrence-free survival, overall survival