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The relationship between combined WRN, SULF2 promoter methylation and the sensitivity for gastric cancer to irinotecan. W-S-: WRN unmethylation、SULF2 unmethylation; W + S-: WRN methylation、SULF2 unmethylation. W-S + : WRN unmethylation、SULF2 methylation; W + S+: WRN methylation、SULF2 methylation.
