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J. Smith



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    ORAL 23 - Prevention and Cancer Risk (ID 121)

    • Event: WCLC 2015
    • Type: Oral Session
    • Track: Prevention and Tobacco Control
    • Presentations: 1
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      ORAL23.01 - A Randomized Phase IIb Trial of Myo-Inositol in Smokers with Bronchial Dysplasia (ID 856)

      10:45 - 12:15  |  Author(s): J. Smith

      • Abstract
      • Presentation
      • Slides

      Background:
      Previous preclinical studies and a phase I clinical trial suggested myo-inositol may be a safe and effective lung cancer chemopreventive agent. We conducted a randomized, double blind, placebo-controlled, phase IIb study to determine the chemopreventive effects of myo-inositol in smokers with bronchial dysplasia.

      Methods:
      Smokers with ≥1 site of dysplasia identified by autofluorescence bronchoscopy-directed biopsy were randomly assigned to receive oral placebo or myo-inositol, 9 g once/day for two weeks, and then twice/day for 6 months. The primary endpoint was change in dysplasia rate after six months of intervention on a per participant basis. Other trial endpoints reported herein include Ki-67 labeling index and pro-inflammatory, oxidant/anti-oxidant biomarker levels in blood and bronchoalveolar lavage fluid (BAL).

      Results:
      Seventy four (n=38 myo-inositol, n=36 placebo) participants with a baseline and 6-month bronchoscopy were included in all efficacy analyses. The complete response and the progressive disease rates were 26.3% versus 13.9% and 47.4% versus 33.3%, respectively, in the myo-inositol and placebo arms (p=0.76). The mean percent change in Ki67 labeling index in bronchial biopsies with dysplasia was -22.8% and -6.2%, respectively, in the myo-inositol and placebo arms (p=0.34). Compared with placebo, myo-inositol intervention significantly reduced IL-6 levels in BAL over 6 months (p=0.03) and had borderline significant effects on BAL myeloperoxidase (p= 0.06) level.

      Conclusion:
      The heterogeneous response to myo-inositol suggests a targeted therapy approach based on molecular alterations is needed in future clinical trials to determine the efficacy of myo-inositol as a chemopreventive agent.

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