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Abstract
Laparoscopic microwave ablation (LMWA) has yet to gain a specific place in treatment guidelines for early hepatocellular carcinoma (HCC). This study compared the outcomes of LMWA and trans-arterial chemoembolization (TACE) for early non-resectable patients with HCC, taking percutaneous radiofrequency ablation (PRFA) as the reference treatment. A retrospective multicenter observational study was conducted, enrolling non-transplantable, non-resectable patients who had early HCC treated with LMWA (n = 658) from Padua and Milan centers, and with PRFA (n = 844), and TACE (n = 425) from the ITA.LI.CA multicenter database. The matching-adjusted indirect comparison (MAIC) method was used to obtain weighted LMWA and TACE populations similar to the reference PRFA population. Laparoscopic ablation showed an excellent safety profile, and MAIC-weighted early postoperative deaths were comparable among the groups. The MAIC-weighted overall survival was similar between the LMWA (1-, 3-, and 5year survival of 91.0 %, 67.9 %, 47.0 %, respectively) and PRFA (1-, 3- and 5year survivals of 90.0 %, 64.7 %, 46.6 %, respectively) groups (p = 0.678) and significantly better for the LMWA group than for the TACE group (1-, 3- and 5year survivals of 84.7 %, 48.8 %, 33.6 %, respectively) (p < 0.001). Weighted multivariate overall survival analysis and competing risk/subgroup analyses confirmed the non-inferiority of LMWA to PRFA and its superiority to TACE. The LMWA- and PRFA-treated patients had a significantly lower risk of HCC-related death (p = 0.004) than the TACE-treated patients (p = 0.001). Conversely, the groups did not differ significantly in terms of non-HCC-related deaths. The non-inferiority of LMWA to PRFA, its superiority to TACE, and its applicability to a wide range of presentations with few contraindications support its inclusion among radical therapies for treating early-HCC patients.
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