Randomized phase II trial of erlotinib with and without entinostat in patients with advanced non-small-cell lung cancer who progressed on prior chemotherapy

J Clin Oncol. 2012 Jun 20;30(18):2248-55. doi: 10.1200/JCO.2011.38.9411. Epub 2012 Apr 16.


Purpose: Histone deacetylase inhibitors (HDACis) have been shown to overcome resistance to epidermal growth factor receptor tyrosine kinase inhibitors (EGFR-TKIs) linked to epigenetic changes and epithelial-mesenchymal transition (EMT) state. This randomized phase II study evaluated the outcome of erlotinib with and without the isoform selective HDACi, entinostat.

Patients and methods: Previously treated patients with stage IIIB/IV non-small-cell lung cancer, no prior EGFR-TKIs, and performance status ≤ 2 were randomly administered erlotinib 150 mg on days 1 through 28 plus entinostat 10 mg orally on days 1 and 15 every 28 days (EE) or erlotinib plus placebo (EP). The primary end point was 4-month progression-free survival (PFS) rate with additional end points including 6-month PFS rate, PFS, and overall survival (OS). Exploratory analyses included EMT- and EGFR-related biomarker analysis on archival tissue.

Results: One hundred thirty-two patients were enrolled (EE, 67; EP, 65). The 4-month PFS rate was comparable for both groups (EE, 18% v EP, 20%; P = .7). In the subset of patients with high E-cadherin levels, OS was longer in the EE group compared with the EP group (9.4 v 5.4 months; hazard ratio, 0.35; 95% CI, 0.13 to 0.92; P = .03) with a corresponding trend toward increased PFS. The adverse event (AE) profile was acceptable, with rash, fatigue, diarrhea, and nausea the most common AEs in both groups.

Conclusion: Erlotinib combined with entinostat did not improve the outcomes of patients in the overall study population when compared with erlotinib monotherapy. High E-cadherin expression levels at time of diagnosis indicate an increased sensitivity to HDACi/EGFR-TKI inhibition providing the basis for a biomarker-driven validation study.

Publication types

  • Clinical Trial, Phase II
  • Randomized Controlled Trial
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Antineoplastic Combined Chemotherapy Protocols / therapeutic use
  • Benzamides / administration & dosage*
  • Biomarkers, Tumor / metabolism
  • Cadherins / metabolism
  • Carcinoma, Non-Small-Cell Lung / drug therapy*
  • Erlotinib Hydrochloride
  • Female
  • Histone Deacetylase Inhibitors / administration & dosage*
  • Humans
  • Lung Neoplasms / drug therapy*
  • Male
  • Middle Aged
  • Pyridines / administration & dosage*
  • Quinazolines / therapeutic use*


  • Benzamides
  • Biomarkers, Tumor
  • Cadherins
  • Histone Deacetylase Inhibitors
  • Pyridines
  • Quinazolines
  • entinostat
  • Erlotinib Hydrochloride