A phase III randomized trial of thalidomide plus zoledronic acid versus zoledronic acid alone in patients with asymptomatic multiple myeloma

T. E. Witzig, K. M. Laumann, M. Q. Lacy, S. R. Hayman, A. Dispenzieri, S. Kumar, C. B. Reeder, V. Roy, J. A. Lust, M. A. Gertz, P. R. Greipp, H. Hassoun, S. J. Mandrekar, S. V. Rajkumar

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61 Scopus citations

Abstract

Patients with asymptomatic (smoldering) multiple myeloma (AMM) have a high risk of transformation to active multiple myeloma (MM). Bisphosphonates such as zoledronic acid (ZLD) reduce skeletal events in MM and the immunomodulatory agent thalidomide (Thal) has proven effectiveness in active MM. We hypothesized that treatment with Thal and ZLD would prolong the time to progression (TTP) to MM over ZLD alone. Eligible patients had asymptomatic MM and all patients received ZLD 4 mg intravenous monthly; the treatment arm also received Thal 200 mg per day. The TTP was superior for Thal/ZLD (n=35) patients compared with ZLD alone (n=33); median TTP of 2.4 years (95% confidence interval (CI): 1.4-3.6) versus 1.2 years (95% CI: 0.7-2.5) (hazard ratio (HR), 2.05; 95% CI: 1.1-3.8; P-value: 0.02). At 1 year, 86% of Thal/ZLD patients were progression free compared with 55% on ZLD alone (P=0.0048). The overall response rate after year 1 was 37% for Thal/ZLD with a median duration of response of 3.3 years (95% CI: 1.1-NA); there were no confirmed responses to ZLD alone (P=0.0004). The addition of Thal to standard ZLD produces anti-tumor responses whereas ZLD alone does not. Thal/ZLD also prolongs TTP from AMM to MM. This study provides the rationale for further studies in patients with AMM to delay chemotherapy.

Original languageEnglish (US)
Pages (from-to)220-225
Number of pages6
JournalLeukemia
Volume27
Issue number1
DOIs
StatePublished - Jan 2013

Keywords

  • smoldering multiple myeloma
  • thalidomide
  • zoledronic acid

ASJC Scopus subject areas

  • Hematology
  • Oncology
  • Cancer Research

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