Background And Aims: Risk factors for subtypes of esophageal and gastric cancer recently have been identified, but their effect on survival is unknown.
Methods: Incident cases (n = 1142) from a population-based case-control study were followed-up from diagnosis (1993-1995) until 2000. Cox regression models were used to estimate adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) for esophageal and gastric cancer in relation to prediagnostic factors.
Results: Relative to distant stage, esophageal adenocarcinoma (EA) patients with localized disease had a decreased risk for death (HR, .22; 95% CI, .15-.31), followed by those with regional spread (HR, .32; 95% CI, .23-.45). Similar patterns were seen for the other tumor types. Except for other (non-cardia) gastric adenocarcinomas (OGA), higher household income (> or =15,000 US dollars/y vs. <15,000 US dollars/y) was associated with a 33%-38% decrease in risk for death. Prediagnosis body mass index (BMI) between 25 and 29.9 kg/m 2 was associated with longer survival for EA and OGA patients (EA: HR, .67; 95% CI, .51-.88) vs. BMI <25 kg/m(2). Women with esophageal squamous cell carcinoma (ES) and OGA experienced longer survival compared with men. Age, education, cigarette smoking, alcohol intake, gastroesophageal reflux disease, and nonsteroidal anti-inflammatory drug use did not consistently predict survival.
Conclusions: Predictors of lengthened esophageal and gastric cancer survival included higher income (except in OGA), overweight (among EA and OGA patients), and female sex (among ES and OGA patients).
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