Division of Molecular Genetic Epidemiology, German Cancer Research Center (DKFZ), CO50, Im Neuenheimer Feld 580, 69120 Heidelberg, Germany. m.mousavi@dkfz.de
The observed increased risks of noncardia stomach cancer among foreign-born second-generation immigrants compared to the Swedes suggest that these immigrants were infected by Helicobacter pylori before immigration.