HSP60 Predicts Survival in Advanced Serous Ovarian Cancer

Int J Gynecol Cancer. 2013 Mar;23(3):448-55. doi: 10.1097/IGC.0b013e318284308b.

Abstract

Objective: Heat shock protein 60 (HSP60) plays an essential role in malignant cell survival. We evaluated the prognostic and treatment predictive value of HSP60 in advanced ovarian cancer.

Methods: Fresh tumor samples were prospectively collected from 123 patients undergoing primary surgery for suspected advanced ovarian cancer. Of these, 57 fulfilled the eligibility criteria, that is, International Federation of Gynecology and Obstetrics stage IIC-IV, serous/endometrioid tumors, platinum-based chemotherapy, and specimens with 50% tumor cells or greater. Heat shock protein 60 mRNA and protein expression was determined by real-time polymerase chain reaction and immunohistochemistry. We estimated the association between HSP60 and overall survival (OS) and platinum-free interval (PFI) by Cox proportional hazards models and its relationship with treatment response by Fisher's exact test. Median follow-up was 60 months.

Results: High HSP60 mRNA expression was associated with shorter OS (hazard ratio [HR], 3.4; 95% confidence interval [CI], 1.3-8.5) and PFI (HR, 3.3; 95% CI, 1.5-7.2). Likewise, high HSP60 protein expression was associated with shorter OS (HR, 3.2; 95% CI, 1.5-7.1) and PFI (HR, 2.6; 95% CI, 1.3-5.3). Median survival for patients with high HSP60 protein expression was 31 months compared with 55 months for low expression cases (P = 0.016). The impact on OS and PFI was even stronger in the subgroup of grade 3 serous tumors. All patients with low HSP60 levels responded to first-line chemotherapy.

Conclusion: Heat shock protein 60 may identify groups of advanced serous ovarian cancer with different prognosis and treatment response.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Aged
  • Aged, 80 and over
  • Chaperonin 60 / genetics
  • Chaperonin 60 / metabolism*
  • Cystadenocarcinoma, Serous / metabolism
  • Cystadenocarcinoma, Serous / mortality*
  • Cystadenocarcinoma, Serous / pathology
  • Endometrial Neoplasms / metabolism
  • Endometrial Neoplasms / mortality*
  • Endometrial Neoplasms / pathology
  • Fallopian Tube Neoplasms / metabolism
  • Fallopian Tube Neoplasms / mortality*
  • Fallopian Tube Neoplasms / pathology
  • Female
  • Follow-Up Studies
  • Humans
  • Immunoenzyme Techniques
  • Middle Aged
  • Mitochondrial Proteins / genetics
  • Mitochondrial Proteins / metabolism*
  • Neoplasm Grading
  • Neoplasm Staging
  • Ovarian Neoplasms / metabolism
  • Ovarian Neoplasms / mortality*
  • Ovarian Neoplasms / pathology
  • Peritoneal Neoplasms / metabolism
  • Peritoneal Neoplasms / mortality*
  • Peritoneal Neoplasms / pathology
  • Prognosis
  • Prospective Studies
  • RNA, Messenger / genetics
  • Real-Time Polymerase Chain Reaction
  • Reverse Transcriptase Polymerase Chain Reaction
  • Survival Rate

Substances

  • Chaperonin 60
  • HSPD1 protein, human
  • Mitochondrial Proteins
  • RNA, Messenger