Annals of Surgical Oncology

, Volume 19, Supplement 3, pp 412–420 | Cite as

Expression of IGF1R Is Associated with Tumor Differentiation and Survival in Patients with Lung Adenocarcinoma

  • Ryutaro Kikuchi
  • Makoto Sonobe
  • Masashi Kobayashi
  • Masashi Ishikawa
  • Jiro Kitamura
  • Ei Nakayama
  • Toshi Menju
  • Ryo Miyahara
  • Cheng-long Huang
  • Hiroshi Date
Translational Research and Biomarkers

Abstract

Purpose

The insulin-like growth factor 1 receptor (IGF1R) is widely expressed in normal tissues and many malignancies in humans. We investigated the clinical significance of the expression of the IGF1R gene in human lung adenocarcinoma.

Methods

A total of 238 patients with lung adenocarcinoma were investigated. Quantitative real-time reverse-transcription polymerase chain reaction (RT-PCR) assays were performed to evaluate the gene expression of IGF1R, and immunohistochemical staining was done to evaluate the protein expression of IGF1R.

Results

Among the 238 patients with lung adenocarcinoma, 107 tumors (45.0%) were IGF1R-low and 131 tumors (55.0%) were IGF1R-high. The IGF1R gene expression ratio was significantly lower in moderately to poorly differentiated adenocarcinomas than in well-differentiated adenocarcinomas (P = 0.0388). Gene expression of IGF1R was significantly correlated with protein expression of IGF1R (r = 0.7163, P < 0.0001). Regarding patient survival, overall survival was significantly lower in patients with IGF1R-low tumors than in those with IGF1R-high tumors (63.2% versus 76.1% 5-year survival, P = 0.0188). Multivariate analysis using a Cox proportional-hazards model demonstrated that IGF1R gene status was a significant prognostic factor predicting overall survival of patients with lung adenocarcinoma (hazard ratio 1.800; P = 0.0321). Moreover, the disease-free survival rate was significantly lower in patients with IGF1R-low tumors than in those with IGF1R-high tumors (49.2% versus 64.6% 5-year survival, P = 0.0084).

Conclusion

The present study suggests the level of IGF1R expression to be a useful prognostic marker for patients with dedifferentiated lung adenocarcinoma.

Keywords

Overall Survival Epidermal Growth Factor Receptor Lung Adenocarcinoma Epidermal Growth Factor Receptor Expression Epidermal Growth Factor Receptor Gene 

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Copyright information

© Society of Surgical Oncology 2011

Authors and Affiliations

  • Ryutaro Kikuchi
    • 1
  • Makoto Sonobe
    • 1
  • Masashi Kobayashi
    • 1
  • Masashi Ishikawa
    • 1
  • Jiro Kitamura
    • 1
  • Ei Nakayama
    • 1
  • Toshi Menju
    • 1
  • Ryo Miyahara
    • 1
  • Cheng-long Huang
    • 1
  • Hiroshi Date
    • 1
  1. 1.Department of Thoracic Surgery, Faculty of MedicineKyoto UniversityKyotoJapan

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