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Prognostic role of insulin-like growth factor receptor-1 expression in small cell lung cancer

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Chang MH, Lee J, Han J, Park YH, Ahn JS, Park K, Ahn M-J. Prognostic role of insulin-like growth factor receptor-1 expression in small cell lung cancer. APMIS 2009; 117: 861–9.

Insulin-like growth factor receptor-1 (IGFR-1) is a cellular membrane receptor which is overexpressed in many tumors and seems to play a critical role in anti-apoptosis. The insulin-like growth factor binding protein-3 (IGFBP-3) is known as a growth suppressor in multiple signaling pathways. The aim of this study was to determine IGFR-1 and IGFBP-3 expression in small-cell lung cancer (SCLC) and analyze the prognostic value in patients with SCLC. We analyzed IGFR-1 and IGFBP-3 expression in 194 SCLC tissues by immunohistochemical staining. Correlative analyses between IGFR-1 and IGFBP-3 expression in SCLC and clinicopathologic factors were performed. A total of 117 patients had extensive disease (ED) (60.3%) and 77 had limited disease (39.7%). With the median follow-up duration of 49.5 months (24–82 months), the median progression-free survival (PFS) and overall survival (OS) were 7.2 months [95% confidence interval (CI): 6.4–8.0 months] and 14.4 months (95% CI: 12.7–16 months), respectively. IGFR-1 expression was observed in 154 of the 190 tumor tissues, whereas there was no IGFBP-3 expression. Multivariate analysis showed that stage (p <0.001), response rate (p <0.001), and lactate dehydrogenase (LDH) levels (p <0.001) were the independent prognostic factors for PFS, and age (p =0.014), LDH level (p <0.001), and stage (p <0.001) for OS. The IGFR-1 positivity was not associated with PFS or OS in the entire cohort. Subgroup analysis revealed that OS was significantly longer in patients with IGFR-1-positive tissue than IGFR-1-negative tissue in SCLC-ED (p =0.034). These results suggest that IGFR-1 expression may be useful as a prognostic marker in patients with SCLC-ED.
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Keywords: Small cell lung cancer; insulin-like growth factor receptor-1; prognostic factor

Document Type: Research Article

Affiliations: 1: Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea 2: Divisions of Hematology-Oncology, Medicine

Publication date: 2009-12-01

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