title: Extra chromosome 12 in chronic lymphocytic leukaemia.
mesh_terms: D000368:Aged; D002869:Chromosome Aberrations; D002906:Chromosomes, Human, 6-12 and X; D005260:Female; D006801:Humans; D007945:Leukemia, Lymphoid / Q000235:genetics*; D008297:Male; D008677:Metaphase; D008875:Middle Aged