WATERTOWN, Mass. — C4 Therapeutics, Inc. (C4T) (Nasdaq: CCCC), a clinical-stage biopharmaceutical company dedicated to advancing targeted protein degradation science, today announced that it has entered into a clinical trial collaboration and supply agreement with Pfizer Inc. Under the terms of the agreement, Pfizer will supply elranatamab (ELREXFIO®), a B-cell maturation antigen CD3 targeted bispecific antibody (BCMAxCD3 bispecific), to C4T for its upcoming Phase 1b trial.
The Phase 1b trial will evaluate the safety and tolerability of cemsidomide, an IKZF1/3 degrader, and dexamethasone in combination with elranatamab as a second line or later therapy for patients with multiple myeloma. This Phase 1b trial, which is expected to initiate in Q2 2026, will seek to establish an optimal dose for cemsidomide in combination with elranatamab. Under the terms of the agreement, Pfizer will supply elranatamab at no cost while C4T will sponsor and conduct the trial.
“We look forward to initiating this trial to evaluate cemsidomide in combination with elranatamab in the hopes we can develop a new treatment regimen and potentially improve outcomes for multiple myeloma patients in earlier lines of therapy,” said Andrew Hirsch, president and chief executive officer of C4 Therapeutics. “Our supply agreement with Pfizer creates an opportunity for cemsidomide to be combined with elranatamab, which is on the path to potentially becoming a standard of care BCMAxCD3 bispecific in a growing market.”
Data generated from the cemsidomide Phase 1 trial in relapsed/refractory multiple myeloma demonstrate robust T-cell activation and cytokine expression across multiple doses. By activating immune T-cells, cemsidomide, when combined with a BCMAxCD3 bispecific such as elranatamab, may amplify the anti-myeloma immune response and lead to higher quality of responses.
About Cemsidomide
Cemsidomide is an investigational, orally bioavailable small-molecule degrader in clinical development for the treatment of relapsed/refractory multiple myeloma. Data from the Phase 1 trial, which has completed enrollment, demonstrate cemsidomide’s differentiated safety and tolerability profile and class-leading anti-myeloma activity that together support the potential for durable outcomes. Two clinical trials are planned to further evaluate cemsidomide in relapsed/refractory multiple myeloma: a Phase 2 single-arm registrational trial to evaluate cemsidomide in combination with dexamethasone, which is expected to initiate in Q1 2026; and a Phase 1b trial to evaluate the safety and tolerability of cemsidomide and dexamethasone in combination with elranatamab, which is expected to initiate in Q2 2026.
About C4 Therapeutics
C4 Therapeutics (C4T) (Nasdaq: CCCC) is a clinical-stage biopharmaceutical company dedicated to delivering on the promise of targeted protein degradation science to create a new generation of medicines that transforms patients’ lives. C4T is progressing targeted oncology programs through clinical studies and leveraging its TORPEDO® platform to efficiently design and optimize small-molecule medicines to address difficult-to-treat diseases. C4T’s degrader medicines are designed to harness the body’s natural protein recycling system to rapidly degrade disease-causing proteins, offering the potential to overcome drug resistance, drug undruggable targets and improve patient outcomes. For more information, please visit www.c4therapeutics.com.
Investors Contact
Courtney Solberg
Associate Director, Investor Relations
[email protected]
Media Contact
Loraine Spreen
Senior Director, Corporate Communications & Patient Advocacy
[email protected]