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The rate of positive serum RASSF1A methylation in the HCC, LC, CHB and healthy control groups. The positive rate was 64.2 % (122/190), 17.5 % (20/114), 5.0 % (6/120) and 0 (0/160), respectively; P * < 0.01 versus CHB; P ** < 0.001 versus LC, CHB
