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Blood, 15 March 2006, Vol. 107, No. 6, pp. 2271-2278.
Prepublished online as a Blood First Edition Paper on December 6, 2005; DOI 10.1182/blood-2005-07-2845.
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CLINICAL TRIALS AND OBSERVATIONS
Quantitative assessment of molecular remission after high-dose therapy with autologous stem cell transplantation predicts long-term remission in mantle cell lymphoma
Christiane Pott,
Carsten Schrader,
Stefan Gesk,
Lana Harder,
Markus Tiemann,
Thorsten Raff,
Monika Brüggemann,
Matthias Ritgen,
Benedikt Gahn,
Michael Unterhalt,
Martin Dreyling,
Wolfgang Hiddemann,
Reiner Siebert,
Peter Dreger, and
Michael Kneba
From the Second Medical Department, Institute of Human Genetics, Institute of Hematopathology, University Hospital Schleswig-Holstein, Campus Kiel; Department of Internal Medicine III, University of Munich, Grosshadern; Department of Medicine V, University of Heidelberg, Germany.
To evaluate the prognostic impact of minimal residual disease (MRD), quantitative real-time polymerase chain reaction (RQ-PCR) of clonal IGH rearrangements was performed in 29 patients with mantle cell lymphoma (MCL) treated with high-dose radiochemotherapy and autologous stem cell transplantation (ASCT). Fourteen of 27 patients evaluable for MRD after ASCT achieved complete clinical and molecular remission, whereas 13 patients had detectable MRD within the first year after ASCT. Molecular remission after ASCT was strongly predictive for improved outcome, with a median progression-free survival (PFS) of 92 months in the MRD-negative group compared with 21 months in the MRD-positive group (P < .001). Median overall survival (OS) was 44 months in the MRD-positive group and has not been reached in the MRD-negative group (P < .003). In multivariate analysis, molecular remission and bulky disease were independent prognostic factors for PFS (P = .001 and P = .021, respectively). While cyclophosphamide, doxorubicin, vincristine, prednisolone (CHOP)like cytoreduction had only modest influence, ara-Ccontaining mobilization and myeloablative radiochemotherapy significantly reduced MRD. Quantitative MRD measured in the stem cell products of 27 patients was not predictive for molecular remission. We conclude that sequential quantitative monitoring of residual disease after ASCT is a powerful indicator for treatment outcome in MCL and defines subgroups of patients with a significantly different prognosis.

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