A phase I pharmacokinetic and pharmacodynamic study of dalotuzumab (MK-0646), an anti-insulin-like growth factor-1 receptor monoclonal antibody, in patients with advanced solid tumors

Francesco Atzori, Josep Tabernero, Andrés Cervantes, Ludmila Prudkin, Jordi Andreu, Edith Rodríguez-Braun, Amparo Domingo, Jorge Guijarro, Cristina Gamez, Jordi Rodon, Serena Di Cosimo, Holly Brown, Jason Clark, James S. Hardwick, Robert A. Beckman, William D. Hanley, Karl Hsu, Emiliano Calvo, Susana Roselló, Ronald B. LangdonJosé Baselga

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: Insulin-like growth factor-1 receptor (IGF-1R) mediates cellular processes in cancer and has been proposed as a therapeutic target. Dalotuzumab (MK-0646) is a humanized IgG1 monoclonal antibody that binds to IGF-1R preventing receptor activation. This study was designed to evaluate the safety and tolerability of dalotuzumab, determine the pharmacokinetic (PK) and pharmacodynamic (PD) profiles, and identify a recommended phase II dose. Experimental Design: Patients with tumors expressing IGF-1R protein were allocated to dose-escalating cohorts of three or more patients each and received intravenous dalotuzumab weekly, every 2 or 3 weeks. Plasma was collected for PK analysis. Paired baseline and on-treatment skin and tumor biopsy samples were collected for PD analyses. Results: Eighty patients with chemotherapy-refractory solid tumors were enrolled. One dose-limiting toxicity was noted, but a maximum-tolerated dose was not identified. Grade 1 to 3 hyperglycemia, responsive to metformin, occurred in 15 (19%) patients. At dose levels or more than 5 mg/kg, dalotuzumab mean terminal half-life was 95 hours or more, mean Cmin was more than 25 μg/mL, clearance was constant, and serum exposures were approximately dose proportional. Decreases in tumor IGF-1R, downstream receptor signaling, and Ki67 expression were observed. 18F-Fluorodeoxy- glucose positron emission tomography metabolic responses occurred in three patients. One patient with Ewing's sarcoma showed a mixed radiologic response. The recommended phase II doses were 10, 20, and 30 mg/kg for the weekly, every other week, and every third week schedules, respectively. Conclusions: Dalotuzumab was generally well-tolerated, exhibited dose-proportional PK, inhibited IGF-1R pathway signaling and cell proliferation in treated tumors, and showed clinical activity. The low clearance rate and long terminal half-life support more extended dosing intervals.

Original languageEnglish
Pages (from-to)6304-6312
Number of pages9
JournalClinical Cancer Research
Volume17
Issue number19
DOIs
Publication statusPublished - Oct 1 2011

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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