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- W2095293611 abstract "Phase III trials of the anti-insulin-like growth factor type 1 receptor (IGF-IR) antibody figitumumab (F) in unselected non-small-cell lung cancer (NSCLC) patients were recently discontinued owing to futility. Here, we investigated a role of free IGF-1 (fIGF-1) as a potential predictive biomarker of clinical benefit from F treatment. Pre-treatment circulating levels of fIGF-1 were tested in 110 advanced NSCLC patients enrolled in a phase II study of paclitaxel and carboplatin given alone (PC) or in combination with F at doses of 10 or 20 mg kg−1 (PCF10, PCF20). Cox proportional hazards model interactions were between 2.5 and 3.5 for fIGF-1 criteria in the 0.5–0.9 ng ml−1 range. Patients above each criterion had a substantial improvement in progression-free survival on PCF20 related to PC alone. Free IGF-1 correlated inversely with IGF binding protein 1 (IGFBP-1, ρ=−0.295, P=0.005), and the pre-treatment ratio of insulin to IGFBP-1 was also predictive of F clinical benefit. In addition, fIGF-1 levels correlated with tumour vimentin expression (ρ=0.594, P=0.021) and inversely with E-cadherin (ρ=–0.389, P=0.152), suggesting a role for fIGF-1 in tumour de-differentiation. Free IGF-1 may contribute to the identification of a subset of NSCLC patients who benefit from F therapy." @default.
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- W2095293611 date "2010-11-23" @default.
- W2095293611 modified "2023-10-18" @default.
- W2095293611 title "Pre-treatment levels of circulating free IGF-1 identify NSCLC patients who derive clinical benefit from figitumumab" @default.
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- W2095293611 doi "https://doi.org/10.1038/sj.bjc.6605972" @default.
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