1. ARGX-110, a highly potent antibody targeting CD70, eliminates tumors via both enhanced ADCC and immune checkpoint blockade
- Author
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Sofie Gabriels, Hans de Haard, Karen Silence, Torsten Dreier, Peter Brouckaert, A. Thibault, Harald Wajant, Leander Huyghe, Peter Ulrichts, Tim Van Hauwermeiren, Mahan Moshir, and Michael A. Saunders
- Subjects
medicine.drug_class ,medicine.medical_treatment ,Immunology ,Antineoplastic Agents ,chemical and pharmacologic phenomena ,Biology ,Lymphocyte Activation ,Monoclonal antibody ,T-Lymphocytes, Regulatory ,Immunoglobulin G ,Neoplasms ,Report ,medicine ,Animals ,Humans ,Immunology and Allergy ,Cytotoxicity ,Cells, Cultured ,CD70 ,Antibody-dependent cell-mediated cytotoxicity ,Antibody-Dependent Cell Cytotoxicity ,Antibodies, Monoclonal ,Cell Cycle Checkpoints ,Immunotherapy ,Immune checkpoint ,Tumor Necrosis Factor Receptor Superfamily, Member 7 ,Cancer research ,biology.protein ,Antibody ,Camelids, New World ,CD27 Ligand ,Signal Transduction - Abstract
Overexpression of CD70 has been documented in a variety of solid and hematological tumors, where it is thought to play a role in tumor proliferation and evasion of immune surveillance. Here, we describe ARGX-110, a defucosylated IgG1 monoclonal antibody (mAb) that selectively targets and neutralizes CD70, the ligand of CD27. ARGX-110 was generated by immunization of outbred llamas. The antibody was germlined to 95% human identity, and its anti-tumor efficacy was tested in several in vitro assays. ARGX-110 binds CD70 with picomolar affinity. In depletion studies, ARGX-110 lyses tumor cells with greater efficacy than its fucosylated version. In addition, ARGX-110 demonstrates strong complement-dependent cytotoxicity and antibody-dependent cellular phagocytosis activity. ARGX-110 inhibits signaling of CD27, which results in blocking of the activation and proliferation of Tregs. In a Raji xenograft model, administration of the fucosylated version of ARGX-110 resulted in a prolonged survival at doses of 0.1 mg/kg and above. The pharmacokinetics of ARGX-110 was tested in cynomolgus monkeys; the calculated half-life is 12 days. In conclusion, ARGX-110 is a potent blocking mAb with a dual mode of action against both CD70-bearing tumor cells and CD70-dependent Tregs. This antibody is now in a Phase 1 study in patients with advanced malignancies expressing CD70 (NCT01813539).
- Published
- 2013
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