title: A chromosomal abnormality in primary thrombocythemia.
mesh_terms: D000328:Adult; D000368:Aged; D002869:Chromosome Aberrations; D002904:Chromosomes, Human, 21-22 and Y; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D013922:Thrombocytosis / Q000235:genetics*