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Blood, 1 April 2006, Vol. 107, No. 7, pp. 2633-2638.
Prepublished online as a Blood First Edition Paper on December 1, 2005; DOI 10.1182/blood-2005-10-4084.
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CLINICAL TRIALS AND OBSERVATIONS
Total therapy 2 without thalidomide in comparison with total therapy 1: role of intensified induction and posttransplantation consolidation therapies
Bart Barlogie,
Guido Tricot,
Erik Rasmussen,
Elias Anaissie,
Frits van Rhee,
Maurizio Zangari,
Athanasios Fassas,
Klaus Hollmig,
Mauricio Pineda-Roman,
John Shaughnessy,
Joshua Epstein, and
John Crowley
From the Myeloma Institute for Research and Therapy, University of Arkansas for Medical Sciences, Little Rock, AR; and Cancer Research and Biostatistics, Seattle, WA.
Patients with myeloma, treated on the thalidomide arm of total therapy 2 (TT2), had a higher complete response (CR) rate and improved event-free survival (EFS) but not overall survival (OS). To evaluate the benefit of TT2's posttandem autotransplant consolidation chemotherapy and dexamethasone maintenance, outcomes were compared on TT2 without thalidomide (n = 345; median follow-up, 3.5 years) and on predecessor trial TT1 (n = 231; median follow-up, 11.5 years). CR rates were similar (43% vs 41%); however, 5-year estimates of continuous CR (45% vs 32%, P < .001) and 5-year EFS (43% vs 28%, P < .001) were superior with TT2, with a trend for improved OS (62% vs 57%; P = .11). OS was also superior among patients achieving CR and receiving the second transplantation early after the first transplantation. Superior EFS and OS with TT2 versus TT1 was noted in the two thirds presenting without cytogenetic abnormalities (CAs); 4-year posttandem transplantation OS for patients with CAs was 47% with TT1 and 76% with TT2 when combination chemotherapy rather than DEX was applied for consolidation (P = .040). Thus, TT2 (without thalidomide) improved OS of patients without CAs; those with CAs benefited from posttransplantation consolidation chemotherapy. The favorable effects of CR and rapidly sequenced second transplantation attest to the validity of a melphalan dose-response effect in myeloma.

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