title: Malignant transformation during immunosuppressive therapy (azathioprine) of rheumatoid arthritis and systemic lupus erythematosus. A retrospective study.
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001172:Arthritis, Rheumatoid / Q000188:drug therapy*; D001379:Azathioprine / Q000009:adverse effects*; D002471:Cell Transformation, Neoplastic / Q000139:chemically induced*; D004938:Esophageal Neoplasms / Q000139:chemically induced; D005260:Female; D006801:Humans; D007165:Immunosuppression Therapy; D008180:Lupus Erythematosus, Systemic / Q000188:drug therapy*; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies
chemical_list: D001379:Azathioprine