Acute leukemia of ambiguous lineage, biphenotype, without CD34, TdT or TCR-rearrangement.
Biphenotypic acute leukemia (BAL) is a rare entity that comprises 0.5-3% of all acute leukemias and probably arises from multipotent progenitor cells. The optimal approach for BAL therapy is unknown. Thus, it is important to elucidate the origin of the neoplastic cells for determination of the appropriate therapy. We report the case of a 41-year-old man with BAL having myeloid and T-lymphoid lineage phenotypes. Strangely, neither CD34 nor TdT expression nor rearrangement of TCR-alpha/beta, delta/gamma genes were shown. This pattern is rarely encountered and suggests that the blast cells were possibly considered immature with aspects of differentiation indicating myeloid lineage, rather than T-lymphoid lineage.
Nishiuchi
Takamasa
T
Division of Hematology, Department of Internal Medicine, Faculty of Medicine, Kagawa University. t111nishiuchi@yahoo.co.jp
Ohnishi
Hiroaki
H
Kamada
Rie
R
Kikuchi
Fumi
F
Shintani
Takamichi
T
Waki
Fusako
F
Kitanaka
Akira
A
Kubota
Yoshitsugu
Y
Tanaka
Terukazu
T
Ishida
Toshihiko
T
D000328:Adult; D018952:Antigens, CD34 / Q000235:genetics*; D019070:Cell Lineage / Q000235:genetics*; D004253:DNA Nucleotidylexotransferase / Q000235:genetics*; D015321:Gene Rearrangement / Q000235:genetics*; D006801:Humans; D015456:Leukemia, Biphenotypic, Acute / Q000175:diagnosis / Q000235:genetics*; D008297:Male; D011948:Receptors, Antigen, T-Cell / Q000235:genetics; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000235:genetics*; D016692:Receptors, Antigen, T-Cell, gamma-delta / Q000235:genetics*
D018952:Antigens, CD34; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta; D016692:Receptors, Antigen, T-Cell, gamma-delta; D004253:DNA Nucleotidylexotransferase