title: [Two cases of pre-B-cell leukemia in childhood (author's transl)].
mesh_terms: D001402:B-Lymphocytes / Q000648:ultrastructure; D002648:Child; D002675:Child, Preschool; D005260:Female; D006801:Humans; D008297:Male; D011289:Preleukemia / Q000473:pathology*