title: Letter: Social contacts and leukaemia-lymphoma: the Philadelphia chromosome rearrangement.
mesh_terms: D000293:Adolescent; D002648:Child; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D005260:Female; D006801:Humans; D007938:Leukemia / Q000235:genetics* / Q000635:transmission; D007945:Leukemia, Lymphoid / Q000235:genetics; D007951:Leukemia, Myeloid / Q000235:genetics; D015470:Leukemia, Myeloid, Acute / Q000235:genetics; D008223:Lymphoma / Q000235:genetics* / Q000635:transmission; D008297:Male