A novel three-way Ph variant t(8;9;22) in adult acute lymphoblastic leukemia.

Although three-way Philadelphia (Ph) variant translocation has been uncommonly (3~8%) reported in chronic myeloid leukemia (CML), it has been even more rarely described in acute leukemias (ALs). When we reviewed the Mitelman database and the literature, we found about 595 three-way Ph variant cases; among these, only 39 three-way Ph variant translocations in AL were documented. Here, we report a novel three-way Ph variant case of t(8;9;22) in adult acute lymphoblastic leukemia (ALL). Based on bone marrow morphology, chromosome fluorescent in situ hybridization (FISH), reverse transcriptase-polymerase chain reaction (RT-PCR), and flow cytometrry, this patient was diagnosed with B lymphoblastic leukemia/lymphoma associated with both t(8;9;22) (q21;q34;q11.2) and BCR/ABL1 rearrangement (e1a2 type). Because of the rarity of reported AL patients with three-way Ph variant, further studies on their prognosis and treatment response to imatinib mesylate are necessary.