AFP and neoplasm: Although the balance between the two groups was improved after applying IPTW, the mean tumor size (2.3 vs. 3.4 cm, p < 0.01, standardized mean difference (SMD) = 0.57) and the median alpha-fetoprotein (AFP) (9.9 vs. 17.6 ng/mL, p = 0.01, SMD = 0.17) were still smaller in the RFA group than in the resection group (Table 1).