METHODS	Patients ' venous blood samples were collected for determining cytokines including interleukin-2 ( IL-2 ) , interleukin-10 ( IL-10 ) , interferon-gamma ( IFN-gamma ) by ELISA and calculating IL-2 / IL-10 ratio before surgery ( T1 ) , 1 h ( T2 ) , 1 day ( T3 ) , and 5 days ( T4 ) after ABT .\