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Clinical Trial Summary

In this phase I first-in-humans-study a vaccine consisting of arginase-1 (ARG1) peptides and the adjuvant Montanide ISA-51 will be tested in ten patients with metastatic solid tumors. Patients will be treated with an ARG1 vaccine every third week for 45 weeks.


Clinical Trial Description

Arginase-1 (ARG1) is an enzyme that converts the amino acid arginine into urea and ornithine. ARG1 is mainly expressed in hepatocytes but different myeloid cells are also capable of ARG1-expression.

An ARG1-induced arginine depletion suppresses T cell function through the impairment of the T cell receptor (TCR)-complex. A research group from the Center for Cancer Immune Therapy (CCIT) have identified spontaneous T cell reactivity against ARG1 peptides in peripheral blood mononuclear cells of cancer patients and healthy donors. The theoretic background for an ARG1 peptide vaccine is to activate ARG1-specific T cells to infiltrate the tumor microenvironment and eliminate ARG1-expressing immunosuppressive cells. We aim to treat 10 patients with progressive solid tumors following treatment with standard of care agents. Patients will receive ARG1 vaccinations administered subcutaneously every third week for 45 weeks.

The primary endpoint is to evaluate safety and toxicity. Immune responses will be assessed using blood- and tumor tissue samples and clinical responses are evaluated using RECIST 1.1. ;


Study Design


Related Conditions & MeSH terms


NCT number NCT03689192
Study type Interventional
Source Herlev Hospital
Contact Cathrine L. Lorentzen, MD
Phone +45 38683868
Email cathrine.lund.lorentzen@regionh.dk
Status Not yet recruiting
Phase Phase 1
Start date October 2018
Completion date April 2020

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