title: Molecular and phenotypic spectrum of de novo Philadelphia positive acute leukemia.
abstract: The Philadelphia chromosome is present in a heterogeneous group of leukemias. It is most commonly associated with chronic myelogenous leukemia (CML) and B-lineage acute lymphoblastic leukemia (ALL) being found in more than 95% and 15-25% of cases respectively. We undertook a study to determine the morphologic, phenotypic and molecular diversity of Philadelphia positive de novo acute leukemia patients seen at our institution over the past 3 1/2 years. Twenty-one patients with de novo acute leukemia were found to have the Philadelphia chromosome by cytogenetic studies. They consisted of 3 patients with acute myelogenous leukemia (AML), 1 biphenotypic leukemia and 17 ALL patients. Of the patients with ALL, 16 were of B-lineage while 1 had a T-cell phenotype. Ten patients expressed the p210 BCR-ABL transcript alone and 10 expressed only the p190 BCR-ABL transcript. One patient had co-expression of p190 and p210 b3a2 BCR-ABL transcripts. Thus the Philadelphia chromosome can be found in a diverse cohort of morphologic and immunologic subtypes of de novo acute leukemia reflecting the heterogeneity of lineage involvement in this disease.
authors.affiliation: Department of Hematology, Singapore General Hospital, Singapore 169608, Republic of Singapore.
authors.forename: L C
authors.initials: LC
authors.lastname: Lim
authors.forename: K K
authors.initials: KK
authors.lastname: Heng
authors.forename: M
authors.initials: M
authors.lastname: Vellupillai
authors.forename: L T
authors.initials: LT
authors.lastname: Tan
authors.forename: B C
authors.initials: BC
authors.lastname: Boey
authors.forename: L C
authors.initials: LC
authors.lastname: Lau
authors.forename: G F
authors.initials: GF
authors.lastname: How
mesh_terms: D000208:Acute Disease; D000293:Adolescent; D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000032:analysis; D000951:Antigens, Neoplasm / Q000032:analysis; D014408:Biomarkers, Tumor / Q000032:analysis / Q000235:genetics*; D002871:Chromosome Banding; D005260:Female; D016044:Fusion Proteins, bcr-abl / Q000032:analysis / Q000235:genetics*; D006801:Humans; D016130:Immunophenotyping; D007951:Leukemia, Myeloid / Q000235:genetics* / Q000473:pathology; D015459:Leukemia-Lymphoma, Adult T-Cell / Q000235:genetics / Q000473:pathology; D008297:Male; D008875:Middle Aged; D014411:Neoplastic Stem Cells / Q000276:immunology / Q000473:pathology; D010641:Phenotype; D015452:Precursor B-Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics / Q000473:pathology; D054198:Precursor Cell Lymphoblastic Leukemia-Lymphoma / Q000235:genetics* / Q000473:pathology; D020033:Protein Isoforms / Q000032:analysis / Q000235:genetics*; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics
chemical_list: D015703:Antigens, CD; D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D020033:Protein Isoforms; D012333:RNA, Messenger; D016044:Fusion Proteins, bcr-abl