title: Association between biliary tract cancer and gastric cancer.
mesh_terms: D000126:Achlorhydria / Q000150:complications / Q000378:metabolism; D001419:Bacteria / Q000378:metabolism; D001659:Biliary Tract / Q000382:microbiology*; D001661:Biliary Tract Neoplasms / Q000209:etiology*; D006801:Humans; D009603:Nitroso Compounds / Q000378:metabolism*; D013270:Stomach / Q000382:microbiology; D013274:Stomach Neoplasms / Q000209:etiology*
chemical_list: D009603:Nitroso Compounds