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Therapy

Outcome of patients with acute promyelocytic leukemia failing to front-line treatment with all-trans retinoic acid and anthracycline-based chemotherapy (PETHEMA protocols LPA96 and LPA99): benefit of an early intervention

Abstract

To determine prognosis of acute promyelocytic leukemia (APL) failing to front-line therapy with all-trans retinoic acid (ATRA) and anthracyclines, outcome of 52 patients (32 M/20 F; age: 37, 3–72) included in PETHEMA trials LPA96 and LPA99 who presented with either molecular failure (MOLrel, n=16) or hematological relapse (HEMrel, n=36) was analyzed. Salvage therapy consisted of ATRA and high-dose ara-C-based chemotherapy (HDAC) in most cases (83%), followed by stem-cell transplantation (autologous, 18; allogeneic, 10; syngeneic, 1). Fourteen patients with MOLrel (88%) achieved second molecular complete response (molCR), whereas 81% HEMrel patients responded to second-line treatment, with 58% molCR. After median follow-up of 45 months, four MOLrel and 18 HEMrel patients, respectively, experienced a second relapse. Outcome after MOLrel compared favorably to HEMrel, with longer survival (5-year survival: 64±14 vs 24±8%, P=0.01) and lower relapse risk (5-year relapse risk: 30±13 vs 64±9%; P=0.044). Additionally, age40 and male gender were favorable variables for survival, whereas molecular response predicted longer leukemia-free survival. In conclusion, early institution of salvage therapy at molecular failure, before onset of hematological relapse, is beneficial in APL. Moreover, given the poor outcome of HEMrel managed with ATRA and HDAC, use of alternative therapeutic strategies in this setting is warranted.

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Acknowledgements

The following investigators and clinical departments belonging to the Spanish Cooperative Group PETHEMA have contributed to this study: MA Sanz, G Martín and P Bolufer (La Fe, Valencia), J Díaz-Mediavilla (Clínico San Carlos, Madrid), V Rubio and E Jean-Paul (Jérez), C Rivas (Alicante), M Tormo (Clínico, Valencia), P Sánchez Godoy (Severo Ochoa, Leganés), L Escoda (Joan XXIII, Tarragona), J Esteve and Dolors Colomer (Clínic, Barcelona), JF Tomás (Fundación Jiménez Díaz, Madrid), M González (Hospital Universitario, Salamanca), S Brunet (Hospital de la Santa Creu i Sant Pau, Barcelona), JD González San Miguel (Insular de Gran Canaria), María José Sayas (Dr Pesset, Valencia), JM Ribera (Germans Trias i Pujol, Badalona), R Parody (Virgen del Rocío, Sevilla), A Novo (Son Dureta, Palma de Mallorca), K Pérez Equiza (Navarra), R Guàrdia (Joan Trueta, Girona), G Vicent and L Madero (Niño Jesús, Madrid), J de la Serna (12 de Octubre, Madrid), JM Bergua (San Pedro de Alcántara, Cáceres), G Debén (Juan Canalejo, A Coruña), C Alvarez and E Amutio (Cruces, Bilbao), JM Martí (Mútua de Terrassa), JJ Ortega (Hospital Infantil Vall Hebron, Barcelona), J Bueno (Vall Hebron, Barcelona), J Arias (Xeral de Lugo), A Montero (Hospital Universitario del Aire, Madrid), MJ Peñarrubia (Río Ortega, Valladolid), M Pérez Encinas (Santiago de Compostela) and C Loureiro (Meixoeiro, Vigo).

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Esteve, J., Escoda, L., Martín, G. et al. Outcome of patients with acute promyelocytic leukemia failing to front-line treatment with all-trans retinoic acid and anthracycline-based chemotherapy (PETHEMA protocols LPA96 and LPA99): benefit of an early intervention. Leukemia 21, 446–452 (2007). https://doi.org/10.1038/sj.leu.2404501

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