#pernicious_anemia__pernicious_anaemia__malignant_anemia__malignantanemia__malignantanaemia  a chronic progressive anemia of older adults; thought to result from a lack of intrinsic factor (a substance secreted by the stomach that is responsible for the absorption of vitamin B12)
  supertype:  #anemia__anaemia  a deficiency of red blood cells
  subtype:  #megaloblastic_anemia__megaloblasticanemia__megaloblasticanaemia  anemia characterized by many large immature and dysfunctional red blood cells (megaloblasts) in the bone marrow; associated with pernicious anemia
  subtype:  #metaplastic_anemia__metaplasticanemia__metaplastic_anaemia__metaplasticanaemia  pernicious anemia in which the various formed elements in the blood are changed

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