Abstract
Purpose
Figitumumab (CP-751,871) is a human IgG2 monoclonal antibody that binds and down-regulates insulin-like growth factor receptor-1 (IGF-1R) and inhibits activation of this receptor by IGF-1 and IGF-2. This nonrandomized, open-label, single-arm, phase II trial evaluated the antitumor activity and safety of figitumumab in patients with metastatic colorectal cancer that was refractory to ≥2 systemic therapies.
Methods
Cohorts A and B received intravenous figitumumab 20 and 30 mg/kg in 3-week cycles, respectively. Both received loading doses (20 or 30 mg/kg) on days 1 and 2 of cycle 1. The primary endpoint was 6-month survival (null hypothesis for each cohort, H0: p6 mo surv = 0.45). Secondary endpoints included progression-free survival (PFS), overall survival (OS), objective response, safety, and pharmacokinetics.
Results
A total of 168 patients (Cohort A, n = 85; Cohort B, n = 83) received figitumumab. Estimated 6-month survival was 49.4 % (95 % CI 38.8–60.0) in Cohort A and 44.1 % (95 % CI 33.4–54.9) in Cohort B. Median OS was 5.8 and 5.6 months, respectively; median PFS was 1.4 months in both cohorts. No objective partial or complete responses occurred. The respective rates of treatment discontinuation due to treatment-related adverse events (AEs) were 5 and 7 %. The most common grade 3/4 nonhematologic AEs in both cohorts were hyperglycemia and asthenia. No grade 4 hematologic laboratory abnormalities occurred. Most deaths were reported as due to progressive disease; none were due to figitumumab.
Conclusion
Six-month survival data do not support further study of figitumumab 20 or 30 mg/kg in this patient population.
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Acknowledgments
We would like to thank all of the participating patients and their families, as well as the global network of investigators, research nurses, study coordinators, and operations staff. This study was supported by funding from Pfizer Inc. Editorial assistance was provided by Susanne Gilbert at ACUMED® (New York, NY, USA) with funding from Pfizer Inc. Medical writing assistance was provided independently by Ann Morcos, MA, ELS, of US Oncology Research, McKesson Specialty Health (The Woodlands, TX, USA) with funding from the Texas Oncology-Sammons Cancer Center.
Conflict of interest
Carlos R. Becerra has received research funding from Pfizer Inc. Ramon Salazar has no conflicts to disclose. Rocio Garcia-Carbonero has served as an advisor/consultant to Pfizer, Merck, Amgen, and Roche. Anne L. Thomas has no conflicts to disclose. Federico J. Vázquez-Mazón has no conflicts to disclose. James Cassidy has received remuneration from Roche and has served as an advisor/consultant to Roche, Amgen, Sanofi, and GlaxoSmithKline. Tim Maughan has served as an advisor/consultant to Genentech and Sanofi. Manuel Gallén Castillo has no conflicts to disclose. Tim Iveson has no conflicts to disclose. Donghua Yin and Stephanie Green are employees of Pfizer Inc, and Stephanie Green holds stock in Pfizer. Emily K. Bergsland has served as an advisor/consultant to Pfizer (uncompensated).
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Becerra, C.R., Salazar, R., Garcia-Carbonero, R. et al. Figitumumab in patients with refractory metastatic colorectal cancer previously treated with standard therapies: a nonrandomized, open-label, phase II trial. Cancer Chemother Pharmacol 73, 695–702 (2014). https://doi.org/10.1007/s00280-014-2391-2
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DOI: https://doi.org/10.1007/s00280-014-2391-2