Leukaemia.
D001854:Bone Marrow Cells; D002869:Chromosome Aberrations; D004314:Down Syndrome; D006801:Humans; D007621:Karyotyping; D007945:Leukemia, Lymphoid / Q000235:genetics*; D007951:Leukemia, Myeloid / Q000235:genetics*; D011086:Polycythemia