title: T-lymphoid blast crisis in chronic myeloid leukemia.
abstract: Chronic myeloid leukemia (CML) is considered to be a pleuripotential stem cell disorder with the capacity to differentiate into myeloid, erythroid, megakaryocytic, and lymphoid cell lines. Consequently, blast crisis (BC) involving each of the above lineages has been well described. Among lymphoblastic crises, differentiation frequently occurs along B-cell lineage. We report four patients of CML who terminated in T-cell extramedullary BC in lymph nodes after a variable duration of chronic phase. The T-lineage was established by characteristic cytochemical staining and reactivity with a panel of anti-T-cell monoclonal antibodies. All four cases were Philadelphia (Ph) chromosome positive and demonstrated the Ph chromosome and associated anomalies (extra Ph, +19) in the lymph nodes. Our data adds to the growing evidence that CML is a disorder of the common stem cell from which T, B, and myeloid precursors originate.
authors.affiliation: Department of Medical Oncology, Tata Memorial Hospital, Parel, Bombay, India.
authors.forename: S H
authors.initials: SH
authors.lastname: Advani
authors.forename: H
authors.initials: H
authors.lastname: Malhotra
authors.forename: P R
authors.initials: PR
authors.lastname: Kadam
authors.forename: R S
authors.initials: RS
authors.lastname: Iyer
authors.forename: G
authors.initials: G
authors.lastname: Nanjangud
authors.forename: B
authors.initials: B
authors.lastname: Balsara
authors.forename: T
authors.initials: T
authors.lastname: Saikia
authors.forename: R
authors.initials: R
authors.lastname: Gopal
authors.forename: C N
authors.initials: CN
authors.lastname: Nair
mesh_terms: D000328:Adult; D015703:Antigens, CD / Q000378:metabolism; D001752:Blast Crisis / Q000453:epidemiology / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D002454:Cell Differentiation; D005455:Fluorescent Antibody Technique; D005500:Follow-Up Studies; D006801:Humans; D007150:Immunohistochemistry; D007621:Karyotyping; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000453:epidemiology / Q000235:genetics / Q000378:metabolism / Q000473:pathology*; D008198:Lymph Nodes / Q000378:metabolism / Q000473:pathology; D008297:Male; D008875:Middle Aged; D013234:Stem Cells / Q000473:pathology; D013601:T-Lymphocytes / Q000378:metabolism / Q000473:pathology
chemical_list: D015703:Antigens, CD