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Blood, 15 August 2000, Vol. 96, No. 4, pp. 1247-1253

CLINICAL OBSERVATIONS, INTERVENTIONS, AND THERAPEUTIC TRIALS

Definition of relapse risk and role of nonanthracycline drugs for consolidation in patients with acute promyelocytic leukemia: a joint study of the PETHEMA and GIMEMA cooperative groups

Miguel A. Sanz, Francesco Lo Coco, Guillermo Martín, Giuseppe Avvisati, Consuelo Rayón, Tiziano Barbui, Joaquín Díaz-Mediavilla, Giuseppe Fioritoni, José David González, Vincenzo Liso, Jordi Esteve, Felicetto Ferrara, Pascual Bolufer, Carlo Bernasconi, Marcos Gonzalez, Francesco Rodeghiero, Dolors Colomer, Maria C. Petti, José M. Ribera, and Franco Mandelli for the Spanish PETHEMA and the Italian GIMEMA Cooperative Groups

From the Hospital Universitario La Fe, Valencia, Spain; University "La Sapienza," Rome, Italy; Hospital Central de Asturias, Oviedo, Spain; Ospedali Riuniti di Bergamo, Bergamo, Italy; Hospital Clínico San Carlos, Madrid, Spain; Ospedale "Civile Spirito Santo"; Pescara, Italy; Hospital Insular de Las Palmas, Las Palmas, Spain; University of Bari, Bari, Italy; Hospital Clinic, Barcelona, Spain; Ospedale Cardarelli, Napoli, Italy; Policlinico S. Matteo, Pavia, Italy; Hospital Universitario, Salamanca, Spain; S. Bartolo Hospital, Vicenza, Italy; Hospital U. Germans Trias i Pujol, Badalona, Spain.

Preliminary independent reports of the Italian GIMEMA and the Spanish PETHEMA trials for newly diagnosed acute promyelocytic leukemia (APL) indicated a similarly high antileukemic efficacy in terms of complete remission and disease-free survival rates. To better investigate these studies and the prognostic factors influencing relapse risk, this study analyzed the updated results of 217 patients with PML/RARalpha -positive APL enrolled in GIMEMA (n = 108) and PETHEMA (n = 109). All patients received identical induction (AIDA schedule) and maintenance. For consolidation, GIMEMA patients received 3 courses including idarubicin/cytarabine, mitoxantrone/etoposide, and idarubicin/cytarabine/thioguanine, whereas PETHEMA patients received the same drugs and dose schedule of idarubicin and mitoxantrone with the omission of nonintercalating agents. Depending on whether molecular relapses were classified as censored or uncensored events, the 3-year Kaplan-Meier estimates of relapse-free survival (RFS) for the combined series were 90 ± 2% and 86 ± 2%, respectively. Minor differences observed between the 2 patient cohorts were negligible. Multivariate regression analysis of RFS showed that initial leukocyte (WBC) and platelet counts were the only variables with independent prognostic value. The resulting predictive model for RFS demonstrated its capability of segregating patients into low-risk (WBC count <=  10 × 109/L, platelet count > 40 × 109/L), intermediate-risk (WBC count <=  10 × 109/L, platelets <=  40 × 109/L), and high-risk (WBC count > 10 × 109/L) groups, with distinctive RFS curves (P < .0001). The conclusions are that omission of nonanthracycline drugs from the AIDA regimen is not associated with reduced antileukemic efficacy and a simple predictive model may be used for risk-adapted therapy in this disease.

© 2000 by The American Society of Hematology.
 

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