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Objective To investigate the role of family aggregation and genetic factors of esophageal cancer (EC), including carcinoma of gastric cardia (CGC), in Cixian county, and to calculate the segregation ratio and heritability of first-degree relatives (FDR) in EC cases. Methods A case control study was conducted, and each of 285 esophageal cancer cases and FDR’s case history and family medical history...
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