title: Adult T-biphenotypic acute leukaemia: clinical and biological features and outcome.
abstract: Biphenotypic acute leukaemia with T-lymphoid and myeloid markers is rare and poorly documented. In the Leucemie Aigue Lymphoblastique de l'Adulte (LALA) prospective trial (LALA 94) of treatment for adult acute lymphoblastic leukaemia (ALL), seven patients (0.86%) had T-biphenotypic forms. The clinical and biological characteristics and outcome of these seven patients are reported here. The patients' median age was 35 years. At diagnosis, all had a tumoural syndrome and five had a mediastinal mass. In all the cases, leukaemic cells expressed myeloid and lymphoid markers. Two patients (28%) entered complete remission (CR) after induction chemotherapy. Four of the five remaining and assessable patients entered CR after designed salvage chemotherapy with mitoxantrone and high-dose cytosine arabinoside. Three patients are currently in CR. Three patients died, from treatment toxicity in two cases and progressive disease in one case. One patient relapsed 6 months after allogeneic bone marrow transplantation and is still alive. Thus, biphenotypic T-acute leukaemia is clinically frequently associated with mediastinal involvement and the response to conventional chemotherapy used in ALL is poor. However, sustained CR can be achieved by salvage chemotherapy combining an intercalating agent with high-dose cytosine arabinoside, as used in acute myeloid leukaemia.
authors: Service d'Hématologie, Hôpital Pitié Salpêtrière, 43-87 Boulevard de l'Hôpital, Paris, France.
authors: M T
authors: MT
authors: Rubio
authors: N
authors: N
authors: Dhedin
authors: C
authors: C
authors: Boucheix
authors: J H
authors: JH
authors: Bourhis
authors: O
authors: O
authors: Reman
authors: J M
authors: JM
authors: Boiron
authors: J H
authors: JH
authors: Gallo
authors: V
authors: V
authors: Lhéritier
authors: X
authors: X
authors: Thomas
authors: D
authors: D
authors: Fière
authors: J P
authors: JP
authors: Vernant
mesh_terms: D000208:Acute Disease; D000328:Adult; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use; D015415:Biomarkers / Q000032:analysis; D003520:Cyclophosphamide / Q000008:administration & dosage; D020732:Cytogenetic Analysis; D003630:Daunorubicin / Q000008:administration & dosage; D006801:Humans; D015255:Idarubicin / Q000008:administration & dosage; D016130:Immunophenotyping; D015470:Leukemia, Myeloid, Acute / Q000188:drug therapy / Q000276:immunology*; D015458:Leukemia, T-Cell / Q000188:drug therapy / Q000276:immunology*; D008297:Male; D011241:Prednisone / Q000008:administration & dosage; D012189:Retrospective Studies; D016896:Treatment Outcome; D014750:Vincristine / Q000008:administration & dosage
chemical_list: D015415:Biomarkers; D014750:Vincristine; D003520:Cyclophosphamide; D011241:Prednisone; D015255:Idarubicin; D003630:Daunorubicin