Drug intelligence / Profile preview

mCALR + CDK9 DAC

Development stage
Preclinical
Lead developer
Prelude Therapeutics
Modality
PROTACs (E3 ligase recruitment) → Targeted Protein Degraders (TPDs) → Small Molecules, Cytotoxic ADCs → Antibody-Drug Conjugates (ADCs) → Antibody Conjugates → Antibody-Based Therapeutics, Monoclonal Antibodies → Antibody-Based Therapeutics, Bivalent/Multivalent Binders → Multivalent & Scaffold-Based Small Molecules → Small Molecules
Administration
Intravenous
01

Overview

The mCALR + CDK9 DAC is an experimental degrader antibody conjugate (DAC) being developed by Prelude Therapeutics for the treatment of CALR-mutated myeloproliferative neoplasms (MPNs), including myelofibrosis (MF) and essential thrombocythemia (ET). This therapeutic modality combines a monoclonal antibody targeting the mutant calreticulin (CALR) neoantigen—found in approximately 25-35% of MF and ET patients—with a novel Cyclin-dependent kinase 9 (CDK9) protein degrader payload. The DAC is designed to selectively bind and internalize within CALR-mutant cells, where the degrader payload is released to induce the proteasomal degradation of CDK9. This mechanism selectively eliminates CALR-mutant MPN progenitor cells while sparing healthy CD34+ hematopoietic stem cells. Preclinical data presented at the 2025 American Society of Hematology (ASH) meeting supports its potential as a disease-modifying therapeutic for patients with CALR mutations.

Other names
mCALR-CDK9 DACmCALR-CDK-9 DACmCALR-CDK 9 DACmutant CALR-CDK9 degrader antibody conjugate
02

Targets

CALR mutant (Calreticulin Mutant Protein)CDK9 (Cyclin-dependent kinase 9)

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