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MSP, methylation-specific polymerase chain reaction; PS, pyrosequencing; M, methylated case; U, unmethylated case; EGC, early gastric carcinoma; AGC, advanced gastric carcinoma; (−), negative expression of COX-2 protein; (+), positive expression of COX-2 protein; IHC, immunohistochemistry.
a)P = 0.054. b)P = 0.403. c)P = 0.371.
