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Prepublished online as a Blood First Edition Paper on May 8, 2003; DOI 10.1182/blood-2003-01-0189.

Submitted January 22, 2003
Accepted April 4, 2003
Molecular remission after myeloablative allogeneic stem cell transplantation predicts a better relapse-free survival in multiple myeloma
Paolo Corradini*, Michele Cavo, Henk Lokhorst, Giovanni Martinelli, Carolina Terragna, Ignazio Majolino, Pinuccia Valagussa, Mario Boccadoro, Diana Samson, Andrea Bacigalupo, Nigel Russell, Vittorio Montefusco, Claudia Voena, and Gosta Gahrton
Hematology - BMT Unit, Istituto Nazionale dei Tumori, University of Milano, Milano, Italy
Hematology, Istituto Seragnoli, University of Bologna, Bologna, Italy
Hematology, University Medical Center, Utrecht, The Netherlands
Hematology, Ospedale San Camillo, Roma, Italy
Hematology, University of Torino, Torino, Italy
Hematology, Imperial College School of Medicine, Hammersmith Hospital, London, United Kingdom
Hematology, Ospedale San Martino, Genova, Italy
Hematology, Nottingham City Hospital, Nottingham, United Kingdom
Hematology, Hiddinge University Hospital, Huddinge, Sweden
* Corresponding author; email: paolo.corradini{at}istitutotumori.mi.it.
Seventy patients in complete clinical remission after myeloablative allogeneic stem cell transplantation (allo-SCT) were enrolled in a longitudinal study to assess the predictive value of molecular monitoring. Using PCR for immunoglobulin gene rearrangements it was possible to generate a clone-specific molecular marker in 48 of the 70 patients. Sixteen of these patients (33%) attained durable PCR-negativity post-transplant, while 13 (27%) remained persistently PCR-positive and 19 (40%) showed a mixed pattern. The cumulative risk of relapse at 5 years was 0% for PCR-negative patients, 33% for PCR-mixed patients and 100% for PCR-positive patients. Within the group studied it was not possible to identify any clinical feature predictive of durable PCR-negativity. We believe that these findings could prompt the design of prospective studies to evaluate if the treatment of molecular disease can extend remission duration and survival.

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