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Phase I study of cetuximab, erlotinib, and bevacizumab in patients with advanced solid tumors

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Abstract

Background

Complex interrelationships exist between the epidermal growth factor receptor (EGFR) and vascular endothelial growth factor (VEGF) receptor pathways. EGFR activation elicits cell proliferation and increased VEGF expression. To maximally inhibit EGFR and then downstream VEGF activity, this phase I study was initiated to determine the maximum tolerated dose (MTD) of erlotinib with fixed-dose cetuximab, and then combine with bevacizumab in patients with advanced malignancies.

Patients and methods

Patients with advanced malignancies likely to express EGFR were treated with a full dose of cetuximab intravenous weekly, combined with various doses of oral erlotinib daily (Part 1). Once the MTD was determined in Part 1, escalating doses of bevacizumab were administered intravenously biweekly (Part 2).

Results

Forty patients were enrolled and received 155 courses over four dose levels. In Part 1, dose-limiting grade 3 rash occurred in two patients administered with erlotinib at 100 mg daily, and the MTD of erlotinib for this combination was 50 mg daily with standard-dose cetuximab (11 patients treated). Other adverse events included rash, diarrhea, fatigue, and hypomagnesemia. In Part 2, bevacizumab at 10 mg/kg intravenous every 2 weeks was safely added, with additional nondose-limiting headache, proteinuria, and hypertension. There was one partial response in a patient with renal cell carcinoma. Durable stable disease was observed in five patients for 6–11 months.

Conclusions

The MTD for Part 1 was 50 mg daily of erlotinib combined with standard cetuximab. Bevacizumab at 10 mg/kg biweekly can be safely administered with the MTD for erlotinib and cetuximab combination.

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Acknowledgments

This study was funded by National Cancer Institute (U01-CA069853).

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Correspondence to Anthony W. Tolcher.

Additional information

Chia-Chi Lin and Emiliano Calvo contributed equally to this study.

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Lin, CC., Calvo, E., Papadopoulos, K.P. et al. Phase I study of cetuximab, erlotinib, and bevacizumab in patients with advanced solid tumors. Cancer Chemother Pharmacol 63, 1065–1071 (2009). https://doi.org/10.1007/s00280-008-0811-x

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  • DOI: https://doi.org/10.1007/s00280-008-0811-x

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