title: Letter: Philadelphia-chromosome-positive preleukaemic state.
mesh_terms: D000368:Aged; D002904:Chromosomes, Human, 21-22 and Y; D005260:Female; D006801:Humans; D007621:Karyotyping; D007951:Leukemia, Myeloid / Q000235:genetics*; D011087:Polycythemia Vera / Q000097:blood / Q000235:genetics*