Precancerous lesions of upper gastrointestinal tract.
D041981:Gastrointestinal Tract; D006801:Humans; D009369:Neoplasms; D013274:Stomach Neoplasms / Q000209:etiology*; D041742:Upper Gastrointestinal Tract
GASTROINTESTINAL SYSTEM/neoplasms; STOMACH NEOPLASMS/etiology