Number of T cell subsets ( CD3 ( + ) , CD4 ( + ) , CD8 ( + ) , CD4 ( + ) / CD8 ( + ) ) and natural killer ( NK ) cell , procalcitonin ( PCT ) , fasting blood glucose ( FBG ) , fasting insulin ( FINS ) , insulin resistance index ( InHOMA-IR ) calculated by the homeostasis model assessment ( HOMA ) were detected before operation and on days 3 and 7 after operation and compared between the two groups .