NCI Drug Dictionary

The NCI Drug Dictionary contains technical definitions and synonyms for drugs/agents used to treat patients with cancer or conditions related to cancer. Each drug entry includes links to check for clinical trials listed in NCI's List of Cancer Clinical Trials.

anti-CD71/vcMMAE probody-drug conjugate CX-2029
A probody-drug conjugate (PDC) composed of a monoclonal antibody directed against the transferrin receptor 1 (TFR1; TRP1; CD71), linked to a proprietary masking peptide that covers the active antigen-binding site of the antibody through a protease-cleavable linker, and conjugated, via a valine-citrulline (VC) peptide linker, to the potent cytotoxic agent monomethyl auristatin E (MMAE), with potential antineoplastic activity. Upon administration of the anti-CD71/vcMMAE PDC CX-2029, the anti-CD71 moiety is unable to bind to CD71 antigen, which is highly expressed on both tumor and healthy dividing cells, until the masking peptide that is attached to the anti-CD71 probody is cleaved by tumor-associated proteases upon extravasation into the tumor microenvironment (TME). Local protease-mediated removal of the linker and masking peptide enables specific binding of the unmasked anti-CD71 moiety to CD71 expressed on tumor cells. Upon internalization and proteolytic cleavage, MMAE is released into the cytosol of CD71-expressing tumor cells, binds to tubulin, and inhibits microtubule polymerization, which induces both G2/M phase arrest and tumor cell apoptosis. CD71, a transmembrane glycoprotein, is a highly expressed protein present in a number of solid and hematologic cancers, but is also expressed on normal, healthy tissues. The peptide masking of CX-2029 minimizes binding of the anti-CD71 antibody moiety to normal, healthy cells and may minimize systemic toxicity, when compared to other anti-CD71 antibody-drug conjugates (ADCs). Tumor-associated proteases are present in high concentrations and aberrantly activated in the TME. Check for active clinical trials using this agent. (NCI Thesaurus)

Synonym:antibody prodrug-drug conjugate CX-2029
anti-CD71 Probody/vcMMAE drug conjugate CX-2029
CD71-directed PDC CX-2029
CD71-directed probody therapeutic CX-2029
PDC CX-2029
PDC-targeting CD71 CX-2029
Code name:CX 2029