Published in:
01-04-2020 | Colon Cancer | Original paper
High IGF1R protein expression correlates with disease-free survival of patients with stage III colon cancer
Authors:
Aziz Zaanan, Claire Calmel, Julie Henriques, Magali Svrcek, Hélène Blons, Christèle Desbois-Mouthon, Fatiha Merabtene, Claire Goumard, Yann Parc, Brice Gayet, Julien Taieb, Pierre Validire, Christophe Louvet, Jean-François Fléjou, Yves Le Bouc, Françoise Praz
Published in:
Cellular Oncology
|
Issue 2/2020
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Abstract
Purpose
The aim of this study was to investigate the association between expression of insulin-like growth factor-1 receptor (IGF1R) and its ligand, IGF-II, and disease-free survival (DFS) in patients with stage III colon cancer (CC).
Methods
In this retrospective study we included consecutive patients who underwent curative surgery for stage III CC. IGF1R and IGF-II/IGF2 status were evaluated in tumour samples by immunohistochemistry and quantitative real-time PCR (qRT-PCR). Associations of markers with DFS were analysed using Cox proportional hazards models.
Results
Hundred and fifty-one CC patients were included (median age, 66.6 years; female, 54.3%). Low levels of IGF1R and IGF-II protein expression were observed in 16.1% and 10.7% of the cases, respectively. No significant differences in clinicopathological characteristics between patients with tumours expressing low IGF1R or IGF-II protein levels and those with high levels were observed. A low IGF1R protein expression was found to be significantly associated with a shorter DFS (HR 3.32; 95% CI, 1.7–6.31; p = 0.0003), while no association was observed between IGF-II protein expression and DFS (HR 0.91; 95% CI, 0.28–2.96; p = 0.87). In a multivariate analysis, IGF1R protein status remained an independent prognostic factor for DFS (HR 2.73; 95% CI, 1.40–5.31; p = 0.003). Furthermore, we found that neither IGF1R nor IGF2 mRNA expression levels as measured by qRT-PCR correlated with the respective protein expression levels as assessed by immunohistochemistry. Neither of the mRNA expression levels was significantly associated with DFS.
Conclusions
From our data we conclude that low IGF1R protein expression represents a poor prognostic biomarker in stage III colon cancer.