Transarterial radioembolization vs chemoembolization for hepatocarcinoma patients:A systematic review and metaanalysis

AIM: To compare the efficacy and safety of yttrium-90 radioembolization(Y90RE) and transarterial chemoembolization(TACE) in hepatocellular carcinoma patients. METHODS: Bibliographic research was conducted on main scientific databases. When there was no statistically significant heterogeneity, pooled effects were calculated using a fixed-effects model by means of Mantel-Haenszel test, otherwise, a random-effects model was used with Der Simonian and Laird test. Summary estimates were expressed in terms of odds ratios(ORs) and 95%CI. The probability of publication bias was assessed using funnel plots and with Begg and Mazumdar’s test. Sensitivity analysis was finally conducted using the method of excluding extreme data.RESULTS: A total of 10 studies were analyzed, of which 2 randomized controlled trials. Survival rate(SR) assessed at 1 year showed an absolute similarity between the two treatment groups(OR = 1.01, 95%CI: 0.78-1.31, P = 0.93). As long as time elapsed since the treatment, ORs for survival rate tended to significantly increase, thus meaning better long-term outcomes in patients who underwent Y90RE(2-year SR: OR = 1.43, 1.08-1.89, P = 0.01; 3-year SR: OR = 1.48, 1.03-2.13, P = 0.04). Meta-analysis of plotted hazard ratios(HRs) determined a non-significant overall estimate in favor of Y90RE(HR = 0.91, 0.80-1.04, P = 0.16). Y90 RE showed a statistically significant benefit as compared to TACE in terms of higher progression-free survival rateassessed at 1 year(OR = 1.67; 95%CI: 1.10-2.55; P = 0.02). Pooled analyses do not revealed a statistically significant increase in OR for tumor objective responses after Y90 RE with respect to TACE(OR = 1.22, 95%CI: 0.69-2.16, P = 0.50). A non-significant trend in favor of Y90 RE was observed according to adverse event rate(OR = 0.70, 0.38-1.30, P = 0.26).CONCLUSION: Our meta-analysis reveals that Y90 RE and TACE show similar effects in terms of survival, response rate and safety profile, although tumor progression is delayed after radioembolization.