title: Systemic mastocytosis associated with t(8;21)(q22;q22) acute myeloid leukemia.
abstract: Although KIT mutations are present in 20-25% of cases of t(8;21)(q22;q22) acute myeloid leukemia (AML), concurrent development of systemic mastocytosis (SM) is exceedingly rare. We examined the clinicopathologic features of SM associated with t(8;21)(q22;q22) AML in ten patients (six from our institutions and four from published literature) with t(8;21) AML and SM. In the majority of these cases, a definitive diagnosis of SM was made after chemotherapy, when the mast cell infiltrates were prominent. Deletion 9q was an additional cytogenetic abnormality in four cases. Four of the ten patients failed to achieve remission after standard chemotherapy and seven of the ten patients have died of AML. In the two patients who achieved durable remission after allogeneic hematopoietic stem cell transplant, recipient-derived neoplastic bone marrow mast cells persisted despite leukemic remission. SM associated with t(8;21) AML carries a dismal prognosis; therefore, detection of concurrent SM at diagnosis of t(8;21) AML has important prognostic implications.
authors: Department of Pathology and Laboratory Medicine, David Geffen School of Medicine at UCLA, 10833 Le Conte Avenue, CHS, A7-149, Los Angeles, CA, 90095-1732, USA, spullarkat@mednet.ucla.edu.
authors: Sheeja T
authors: ST
authors: Pullarkat
authors: Vinod
authors: V
authors: Pullarkat
authors: Steven H
authors: SH
authors: Kroft
authors: Carla S
authors: CS
authors: Wilson
authors: Arshad N
authors: AN
authors: Ahsanuddin
authors: Karen P
authors: KP
authors: Mann
authors: Maung
authors: M
authors: Thein
authors: Wayne W
authors: WW
authors: Grody
authors: Russell K
authors: RK
authors: Brynes