Gastric cancer on ulcer:  a clinical analysis of a series of cases conforming pathologically to the criteria for malignant change in peptic ulcer of the stomach.
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D000368:Aged; D006801:Humans; D010437:Peptic Ulcer / Q000150:complications*; D012919:Social Behavior; D013274:Stomach Neoplasms; D014456:Ulcer