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Background  The strong male predominance in oesophageal adenocarcinoma (OAC) and Barrett’s oesophagus (BO) continues to puzzle. Hormonal influence, e.g. oestrogen or oxytocin, might contribute.    Methods  This genetic-epidemiological study pooled 14 studies from three continents, Australia, Europe, and North America. Polymorphisms in 3 key genes coding for the oestrogen pathway (receptor alpha ( ESR1 ), receptor beta ( ESR2 ), and aromatase ( CYP19A1 )), and 3 key genes of the oxytocin pathway (the oxytocin receptor ( OXTR ), oxytocin protein ( OXT ), and cyclic ADP ribose hydrolase glycoprotein ( CD38 )), were analysed using a gene-based approach, versatile gene-based test association study (VEGAS).    Results  Among 1508 OAC patients, 2383 BO patients, and 2170 controls, genetic variants within  ESR1  were associated with BO in males (p = 0.0058) and an increased risk of OAC and BO combined in males (p = 0.0023). Genetic variants within  OXTR  were associated with an increased risk of BO in both sexes combined (p = 0.0035) and in males (p = 0.0012). We followed up these suggestive findings in a further smaller data set, but found no replication. There were no significant associations between the other 4 genes studied and risk of OAC, BO, separately on in combination, in males and females combined or in males only.    Conclusion  Genetic variants in the oestrogen receptor alpha and the oxytocin receptor may be associated with an increased risk of BO or OAC, but replication in other large samples are needed.

plos one

Polymorphisms in Genes of Relevance for Oestrogen and Oxytocin Pathways and Risk of Barrett’s Oesophagus and Oesophageal Adenocarcinoma: A Pooled Analysis from the BEACON Consortium