A randomized phase II chemoprevention trial of 13-cis retinoic acid with or without α tocopherol or observation in subjects at high risk for lung cancer

Karen Kelly, John Kittelson, Wilbur A. Franklin, Timothy C. Kennedy, Catherine E. Klein, Robert L. Keith, Edward C. Dempsey, Marina Lewis, Mary K. Jackson, Fred R. Hirsch, Paul A. Bunn, York E. Miller

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19 Scopus citations

Abstract

No chemoprevention strategies have been proven effective for lung cancer. We evaluated the effect of 13-cis retinoic acid (13-cis RA), with or without α tocopherol, as a lung cancer chemoprevention agent in a phase II randomized controlled clinical trial of adult subjects at high risk for lung cancer as defined by the presence of sputum atypia, history of smoking, and airflow obstruction, or a prior surgically cured nonsmall cell lung cancer (disease free, >3 years). Subjects were randomly assigned to receive either 13-cis RA, 13-cis RA plus α tocopherol (13-cis RA/α toco) or observation for 12 months. Outcome measures are derived from histologic evaluation of bronchial biopsy specimens obtained by bronchoscopy at baseline and follow-up. The primary outcome measure is treatment "failure" defined as histologic progression (any increase in the maximum histologic score) or failure to return for follow-up bronchoscopy. Seventy-five subjects were randomized (27/22/26 to obervations/13-cis RA/13-cis RA/α toco); 59 completed the trial; 55 had both baseline and follow-up bronchoscopy. The risk of treatment failure was 55.6% (15 of 27) and 50% (24 of 48) in the observation and combined (13 cis RA plus 13 cis RA/α toco) treatment arms, respectively (odds ratio adjusted for baseline histology, 0.97; 95% confidence interval, 0.36-2.66; P = 0.95). Among subjects with complete histology data, maximum histology score in the observation arm increased by 0.37 units and by 0.03 units in the treated arms (difference adjusted for baseline, -0.18; 95% confidence interval, -1.16 to 0.81; P = 0.72). Similar (nonsignificant) results were observed for treatment effects on endobronchial proliferation as assessed by Ki-67 immunolabeling. Twelve-month treatment with 13-cis RA produced nonsignificant changes in bronchial histology, consistent with results in other trials. Agents advancing to phase III randomized trials should produce greater histologic changes. The addition of α tocopherol did not affect toxicity.

Original languageEnglish (US)
Pages (from-to)440-449
Number of pages10
JournalCancer Prevention Research
Volume2
Issue number5
DOIs
StatePublished - May 2009
Externally publishedYes

ASJC Scopus subject areas

  • Cancer Research
  • Oncology
  • Medicine(all)

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    Kelly, K., Kittelson, J., Franklin, W. A., Kennedy, T. C., Klein, C. E., Keith, R. L., Dempsey, E. C., Lewis, M., Jackson, M. K., Hirsch, F. R., Bunn, P. A., & Miller, Y. E. (2009). A randomized phase II chemoprevention trial of 13-cis retinoic acid with or without α tocopherol or observation in subjects at high risk for lung cancer. Cancer Prevention Research, 2(5), 440-449. https://doi.org/10.1158/1940-6207.CAPR-08-0136