The Philadelphia (Ph) chromosome in leukemia. II. Variant Ph translocations in acute lymphoblastic leukemia.
Nearly 20 patients with a masked Philadelphia (Ph) translocation have been described in chronic myelocytic leukemia. We report two instances of acute lymphoblastic leukemia (ALL) with variant Ph translocations. One case, involving a 26-year-old male, was associated with a variant t(14;22)(q32;q11) translocation. The second case involved a 36-year-old male with a more complex translocation, t(9;15;22)(q12;q26;q11). In each case, cells with a masked Ph translocation were observed. These appear to be the first ALL cases reported with a masked Ph chromosome. The findings are discussed in relation to recent knowledge regarding the genesis of the Ph chromosome.
D000328:Adult; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D001853:Bone Marrow / Q000473:pathology; D002871:Chromosome Banding; D002901:Chromosomes, Human, 13-15; D002904:Chromosomes, Human, 21-22 and Y; D002906:Chromosomes, Human, 6-12 and X; D006801:Humans; D007621:Karyotyping; D007945:Leukemia, Lymphoid / Q000188:drug therapy / Q000235:genetics*; D008297:Male; D014178:Translocation, Genetic