Biomarkers That Predict Sensitivity to Heat Shock Protein 90 Inhibitors. Academic Article uri icon

Overview

abstract

  • INTRODUCTION: Heat shock protein (HSP) 90, a viable target for cancer treatment, mediates the maturation and stabilization of client oncoproteins. HSP90 inhibitors (HSP90i) are potentially active in a variety of tumors, but therapeutic benefit is confirmed in only a small subset. We explored potential biomarkers across multiple studies of HSP90i in advanced solid tumors. PATIENTS AND METHODS: Archived tumor specimens from patients treated with HSP90i in 7 different phase I/II trials at Memorial Sloan Kettering Cancer Center were identified. Tumor tissue was tested using immunohistochemistry; estrogen, progesterone, and androgen receptors ≥ 1% positive and < 1% negative; HSP90 and HSP70: 0, 1 + negative, and 2+, 3 + positive; phosphatase and tensin homolog: 0 negative, 1 reduced, and 2 positive; HER2: 0, 1 + negative, 2 + equivocal, 3 + positive; and epidermal growth factor receptor: 0 negative, and 1+, 2+, 3 + positive. The expression of the biomarker panel was correlated with clinical benefit (CB) (defined by overall response [ORR] or CB by the "8-week" scan) using Fisher exact test. RESULTS: Adequate tissue was available for 51 of 158 patients (32%), including 10 different solid tumors. Of these, 71% (36 of 51) and 51% (26 of 51) patients met the criteria to assess CB by best ORR or by the "8-week scan" assessment, respectively. Breast was the most frequent tumor. The mean duration of HSP90i therapy was 55 days (range, 16-411 days). There were 16 responses (4 partial response; 12 stable disease); 13 of 16 responses strongly correlated with HER2-positive status (P = .001). CONCLUSION: Our findings suggest HER2 as a sensitive client and perhaps the only effective biomarker for sensitivity to these HSP90i.

publication date

  • November 19, 2015

Research

keywords

  • Antineoplastic Agents
  • Breast Neoplasms
  • HSP70 Heat-Shock Proteins
  • HSP90 Heat-Shock Proteins
  • Receptor, ErbB-2

Identity

PubMed Central ID

  • PMC5242238

Scopus Document Identifier

  • 84951129233

Digital Object Identifier (DOI)

  • 10.1016/j.clbc.2015.11.004

PubMed ID

  • 26726007

Additional Document Info

volume

  • 16

issue

  • 4