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Abstract
T-cell acute lymphoblastic leukemias (T-ALL) represent 15% of pediatric and 25% of adult ALL. Since they have a particularly poor outcome in relapsed/refractory cases, identifying prognosis factors at diagnosis is crucial to adapting treatment for high-risk patients. Unlike acute myeloid leukemia and BCP ALL, chromosomal rearrangements leading to chimeric fusion-proteins with strong prognosis impact are sparsely reported in T-ALL. To address this issue an RT-MPLA assay was applied to a consecutive series of 522 adult and pediatric T-ALLs and identified a fusion transcript in 20% of cases. PICALM-MLLT10 (4%, n = 23), NUP214-ABL1 (3%, n = 19) and SET-NUP214 (3%, n = 18) were the most frequent. The clinico-biological characteristics linked to fusion transcripts in a subset of 235 patients (138 adults in the GRAALL2003/05 trials and 97 children from the FRALLE2000 trial) were analyzed to identify their prognosis impact. Patients with HOXA trans-deregulated T-ALLs with MLLT10, KMT2A and SET fusion transcripts (17%, 39/235) had a worse prognosis with a 5-year EFS of 35.7% vs 63.7% (HR = 1.63; p = 0.04) and a trend for a higher cumulative incidence of relapse (5-year CIR = 45.7% vs 25.2%, HR = 1.6; p = 0.11). Fusion transcripts status in T-ALL can be robustly identified by RT-MLPA, facilitating risk adapted treatment strategies for high-risk patients.
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1 Université de Paris (Descartes), Institut Necker-Enfants Malades (INEM), Institut national de la santé et de la recherche médicale (Inserm) U1151, and Laboratory of Onco-Hematology, Assistance Publique-Hôpitaux de Paris, Hôpital Necker Enfants-Malades, Paris, France
2 Université de Paris (Descartes), Institut Necker-Enfants Malades (INEM), Institut national de la santé et de la recherche médicale (Inserm) U1151, and Laboratory of Onco-Hematology, Assistance Publique-Hôpitaux de Paris, Hôpital Necker Enfants-Malades, Paris, France; Robert Debré University Hospital (AP-HP), Université de Paris, Department of Pediatric Hematology and Immunology, Paris, France
3 Université de Paris (Descartes), Institut Necker-Enfants Malades (INEM), Institut national de la santé et de la recherche médicale (Inserm) U1151, and Laboratory of Onco-Hematology, Assistance Publique-Hôpitaux de Paris, Hôpital Necker Enfants-Malades, Paris, France; Robert Debré University Hospital (AP-HP), Université de Paris, Department of Pediatric Hematology and Immunology, Paris, France; Institut Curie, PSL Research University, Center for Cancer Immunotherapy, INSERM U932, Paris, France (GRID:grid.418596.7) (ISNI:0000 0004 0639 6384)
4 Université de Paris (Descartes), Institut Necker-Enfants Malades (INEM), Institut national de la santé et de la recherche médicale (Inserm) U1151, and Laboratory of Onco-Hematology, Assistance Publique-Hôpitaux de Paris, Hôpital Necker Enfants-Malades, Paris, France (GRID:grid.418596.7)
5 Université de Paris (Descartes), Institut Necker-Enfants Malades (INEM), Institut national de la santé et de la recherche médicale (Inserm) U1151, and Laboratory of Onco-Hematology, Assistance Publique-Hôpitaux de Paris, Hôpital Necker Enfants-Malades, Paris, France (GRID:grid.418596.7); Robert Debré University Hospital (AP-HP), Université de Paris, Department of Pediatric Hematology and Immunology, Paris, France (GRID:grid.418596.7); Institut Curie, PSL Research University, Center for Cancer Immunotherapy, INSERM U932, Paris, France (GRID:grid.418596.7) (ISNI:0000 0004 0639 6384); Assistance Publique-Hôpitaux de Paris (AP-HP), GH HUEP, Armand Trousseau Hospital, Department of Pediatric Hematology and Oncology, Paris, France (GRID:grid.413776.0) (ISNI:0000 0004 1937 1098); Sorbonne Universités, UPMC Univ Paris 06, UMRS 938, CDR Saint-Antoine, GRC n°07, GRC MyPAC, Paris, France (GRID:grid.465261.2) (ISNI:0000 0004 1793 5929)
6 Université de Paris (Descartes), Institut Necker-Enfants Malades (INEM), Institut national de la santé et de la recherche médicale (Inserm) U1151, and Laboratory of Onco-Hematology, Assistance Publique-Hôpitaux de Paris, Hôpital Necker Enfants-Malades, Paris, France (GRID:grid.465261.2)
7 University College Dublin, Systems Biology Ireland, School of Medicine, Dublin, Ireland (GRID:grid.7886.1) (ISNI:0000 0001 0768 2743)
8 Université catholique de Louvain, CHU UCL Namur - site Godinne, Department of Hematology, Yvoir, Belgium (GRID:grid.7942.8) (ISNI:0000 0001 2294 713X)
9 CHRU Lille, Lille, France and U1172, INSERM, Laboratory of Hematology, Lille, France (GRID:grid.410463.4) (ISNI:0000 0004 0471 8845)
10 Laboratory of Hematology and EA 3518 University Hospital Saint-Louis, AP-HP and Université de Paris, Paris, France (GRID:grid.508487.6) (ISNI:0000 0004 7885 7602)
11 Marseille University Hospital Timone, Hematology Laboratory, Marseille, France (GRID:grid.414336.7) (ISNI:0000 0001 0407 1584)
12 University Hospital of Rennes, Department of Pediatric Hematology and Oncology, Rennes, France (GRID:grid.411154.4) (ISNI:0000 0001 2175 0984)
13 Service d’hématologie clinique, Hôpital Lyon Sud, Marseille, France (GRID:grid.411430.3) (ISNI:0000 0001 0288 2594)
14 Aix-Marseille Univ, Inserm, CNRS, Institut Paoli-Calmettes, CRCM, Marseille, France (GRID:grid.463833.9) (ISNI:0000 0004 0572 0656)
15 Université de Paris (Descartes), Institut Necker-Enfants Malades (INEM), Institut national de la santé et de la recherche médicale (Inserm) U1151, and Laboratory of Onco-Hematology, Assistance Publique-Hôpitaux de Paris, Hôpital Necker Enfants-Malades, Paris, France (GRID:grid.463833.9)
16 PRES LUNAM, CHU Angers service des Maladies du Sang et CRCINA INSERM, Angers, France (GRID:grid.411147.6) (ISNI:0000 0004 0472 0283)
17 Institut de Recherche Saint-Louis, Université de Paris, Paris, France (GRID:grid.508487.6) (ISNI:0000 0004 7885 7602)
18 Assistance Publique-Hôpitaux de Paris (AP-HP), GH HUEP, Armand Trousseau Hospital, Department of Pediatric Hematology and Oncology, Paris, France (GRID:grid.413776.0) (ISNI:0000 0004 1937 1098); Sorbonne Universités, UPMC Univ Paris 06, UMRS 938, CDR Saint-Antoine, GRC n°07, GRC MyPAC, Paris, France (GRID:grid.465261.2) (ISNI:0000 0004 1793 5929)
19 Robert Debré University Hospital (AP-HP), Université de Paris, Department of Pediatric Hematology and Immunology, Paris, France (GRID:grid.465261.2); Institut de Recherche Saint-Louis, Université de Paris, Paris, France (GRID:grid.508487.6) (ISNI:0000 0004 7885 7602)
20 Inserm U1245, Centre Henri Becquerel, Université de Rouen, IRIB, Rouen, France (GRID:grid.10400.35) (ISNI:0000 0001 2108 3034)
21 Institut de Recherche Saint-Louis, Université de Paris, Paris, France (GRID:grid.508487.6) (ISNI:0000 0004 7885 7602); Inserm U1245, Centre Henri Becquerel, Université de Rouen, IRIB, Rouen, France (GRID:grid.10400.35) (ISNI:0000 0001 2108 3034); AP-HP, Hôpital Saint Louis, Unité d’Hématologie Adolescents et Jeunes Adultes, Paris, France (GRID:grid.413328.f) (ISNI:0000 0001 2300 6614)
22 Université de Paris (Descartes), Institut Necker-Enfants Malades (INEM), Institut national de la santé et de la recherche médicale (Inserm) U1151, and Laboratory of Onco-Hematology, Assistance Publique-Hôpitaux de Paris, Hôpital Necker Enfants-Malades, Paris, France (GRID:grid.413328.f)