Pernicious anaemia and lymphoproliferative disease.
D000368:Aged; D000752:Anemia, Pernicious / Q000150:complications* / Q000188:drug therapy; D002471:Cell Transformation, Neoplastic; D006801:Humans; D007945:Leukemia, Lymphoid / Q000139:chemically induced / Q000150:complications*; D008214:Lymphocytes / Q000276:immunology; D008875:Middle Aged; D014805:Vitamin B 12 / Q000009:adverse effects / Q000627:therapeutic use
D014805:Vitamin B 12