A phase I study of EMD 525797, a novel humanized monoclonal antibody to human integrin alpha v, in Japanese patients with solid tumor.

Abstract

e13510 Background: Integrin alpha v, in association with several integrin beta subunits, plays critical roles in migration, invasion, proliferation, and survival of both tumor and endothelial cells and represents an attractive target for cancer treatment. EMD 525797 is a humanized monoclonal IgG2 antibody specifically targeting integrin alpha v. Methods: The safety, tolerability, pharmacokinetics (PK), and anti-tumor activity of EMD 525797 were assessed in Japanese patients with advanced solid tumors, treated with intravenous infusions of 250, 500, 1000, or 1500 mg of EMD 525797 (given over 1 h), who received 3 doses (weeks 1, 3, and 5) before response assessment during week 6. Thereafter, patients without progressive disease could receive further doses every 2 weeks. Dose-limiting toxicities (DLTs) were assessed over the first 4 weeks and safety was monitored until 31 days after the last administration of EMD 525797. Results: A total of 27 patients were treated. Regarding the primary site of disease, 17 patients had colorectal cancer, 3 pancreatic cancer, 2 gastrointestinal stromal tumors (GIST), 1 esophageal cancer, 1 gastric cancer, 1 rectal carcinoid, 1 cholangiocarcinoma, 1 hepatocellular carcinoma, and 1 leiomyosarcoma. Twenty-five patients (92.6%) experienced treatment-emergent adverse events (TEAEs); nausea (25.9%), headache (22.2%), pyrexia (22.2%), stomatitis (22.2%), and vomiting (22.2%) were the most common. None of these TEAEs was greater than grade 3 by NCI-CTCAE version 4.0 and no DLT was observed. Fourteen (51.9%) of the TEAEs were possibly related to EMD 525797. Two patients, 1 with GIST and 1 with rectal carcinoid, had longer than expected exposure time (>84 days). EMD 525797 showed a non-linear PK profile. Distribution volume and clearance after EMD 525797 administration did not show apparent ethnic difference considering body weight influence. Conclusions: EMD 525797 was well tolerated in Japanese patients. The safety profile in Japanese patients was comparable to the results from Caucasian patients. In some patients EMD 525797 treatment duration was longer than expected. Clinical trial information: NCT01327313.