C4 Therapeutics Receives Study May Proceed Letter from U.S. FDA to Initiate Phase 1/2 Clinical Trial of CFT1946, an Orally Bioavailable BiDAC™ Degrader, in BRAF-V600 Mutant Solid Cancers

Phase 1/2 Clinical Trial Will Study CFT1946 in BRAF-V600 Mutant Solid Cancers Including Lung, Colorectal and Melanoma; Trial Initiation Expected by Year End 2022

WATERTOWN, MA, USA I September 29, 2022 I C4 Therapeutics, Inc. (C4T) (Nasdaq: CCCC), a clinical-stage biopharmaceutical company dedicated to advancing targeted protein degradation science to develop a new generation of small-molecule medicines and transform how disease is treated, today announced it has received a Study May Proceed Letter from the United States Food and Drug Administration (FDA) to begin a Phase 1/2 trial for CFT1946, an orally bioavailable mutant-selective BiDAC™ degrader for the treatment of BRAF-V600 mutant solid tumors.

“The Study May Proceed Letter from the FDA, which marks C4T’s third successful oncology investigational new drug application in less than two years, demonstrates the power of our TORPEDO platform to build an exciting portfolio of degrader medicines that have the potential to transform how diseases are treated,” said Andrew Hirsch, president and chief executive officer of C4 Therapeutics. “We designed CFT1946 to be a potent and selective degrader of mutant BRAF-V600, which accounts for approximately 50,000 cancer diagnoses annually. We believe our innovative therapeutic candidate may overcome some limitations of BRAF inhibitor treatments to offer cancer patients the potential for deeper and more durable responses.”

The Phase 1/2 clinical trial will primarily investigate safety, tolerability, and anti-tumor activity, with secondary and exploratory objectives to characterize the pharmacokinetic and pharmacodynamic profile of CFT1946. The initial arm of the Phase 1 portion of the study will evaluate CFT1946 as a single agent in patients with BRAF-V600 mutant solid tumors. As the Phase 1 trial progresses, an additional arm of the trial will evaluate CFT1946 in combination with trametinib in patients with BRAF-V600 mutant solid tumors. Following the identification of the recommended dose, the Phase 2 portion of the trial is expected to expand to three investigational arms to evaluate: (1) CFT1946 monotherapy in patients with V600 mutant melanoma or non-small cell lung cancer (NSCLC) after prior BRAF inhibitor treatment; (2) CFT1946 in combination with trametinib in patients with V600 mutant melanoma or NSCLC after prior BRAF inhibitor treatment; and (3) CFT1946 in combination with trametinib in patients with V600 mutant NSCLC who have not previously been treated with a BRAF inhibitor.

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 transform patients’ lives. C4T is leveraging its TORPEDO® platform to efficiently design and optimize small-molecule medicines that 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. C4T is advancing multiple targeted oncology programs to the clinic and expanding its research platform to deliver the next wave of medicines for difficult-to-treat diseases. For more information, please visit www.c4therapeutics.com.

About CFT1946
CFT1946 is an orally bioavailable BiDAC degrader designed to be potent and selective against BRAF-V600 mutant targets. In pre-clinical studies, CFT1946 is active in vivo and in vitro in models with BRAF-V600E-driven disease and in the escape mutant BRAF models. C4T is advancing CFT1946 to the clinic to study treatment for BRAF-V600 mutant solid tumors including lung, colorectal or melanoma.

SOURCE: C4 Therapeutics

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