Impact of early use of lenalidomide and low-dose dexamethasone on clinical outcomes in patients with relapsed/refractory multiple myeloma
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We retrospectively investigated the prognostic factor of lenalidomide plus low-dose dexamethasone (Rd) in Japanese patients with refractory or relapsed multiple myeloma (RRMM) registered in the Kansai Myeloma Forum from January 2006 to December 2013. A total of 140 patients were analyzed. The median age was 66 years. The overall response rate was 68.6 %, including 33.1 % with a better than very good partial response. At 13.0 months median follow-up, the median overall survival (OS) and progression-free survival (PFS) were 34.2 and 17.0 months, respectively. In univariate analyses, patients with one or two prior therapies had significantly longer OS (41.2 vs. 21.5 months; P = 0.002) and PFS (29.0 vs. 13.0 months; P = 0.006) than patients treated with three or more prior therapies. Prior use of thalidomide was associated with significantly shorter PFS (19.0 vs. 16.0 months; P = 0.045). The prior use of bortezomib or high-dose therapy with stem cell transplantation, and the International Staging System had no impact on long-term outcome. Multivariate analysis showed that only the number of prior therapies was a significant predictor of both OS and PFS. Our findings suggest that greater benefit may occur when Rd therapy is used at the first or second relapse in RRMM.
KeywordsLenalidomide Multiple myeloma Relapse Refractory
We wish to thank all the researchers of the KMF for their scientific support.
Conflict of interest
This work was partly supported by a research fund from the Celgene Corporation (Summit, NJ).
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