SOUTH SAN FRANCISCO, Calif., July 22, 2021 (GLOBE NEWSWIRE) — Catalyst Biosciences, Inc. (NASDAQ: CBIO) today announced the screening of the first patient in its CFI-deficiency study in the CB 4332 program, its wholly-owned, first-in-class, enhanced Complement Factor I (CFI), intended for prophylactic subcutaneous (SQ) administration in individuals with CFI deficiency.

“The findings from the CFI deficiency screening and natural history of disease studies will be instrumental in identifying patients for the Phase 1/2 trial of CB 4332, planned for mid-year 2022,” said Nassim Usman, Ph.D., president and chief executive officer of Catalyst. “Following the disease manifestations and biomarkers of this complement disorder will be important in unlocking the full therapeutic potential of CB 4332.”

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rm screening study will measure CFI levels and activity in patients who have diseases related to a CFI deficiency and who may potentially benefit from CB 4332 treatment. The

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dence natural history of disease study will follow these CFI-deficient subjects, who often present with repetitive bacterial infections, immune-related diseases, and/or glomerulopathies, for clinical biomarkers and safety of current treatments. The findings from these studies will identify opportunities to potentially develop CB 4332 for treatment in multiple indications.

Catalyst’s complement portfolio is led by the development candidates CB 4332 and CB 2782-PEG, originating from the company’s internal discovery platform, which has generated a rich pipeline of leads. CB 4332 is an engineered CFI protease with the potential to address multiple complement related disorders. CB 2782-PEG is designed as a long-acting anti-C3 protease in preclinical development for the treatment of dry AMD that Catalyst has licensed to Biogen. Catalyst has several engineered protease programs in discovery or early non-clinical development. These programs all target diseases caused by deficient regulation of the complement system.

About Catalyst Biosciences, the Protease Medicines company


Catalyst is a research and clinical development biopharmaceutical company focused on addressing unmet medical needs in rare disorders of the complement and coagulation systems. Our protease engineering platform has generated two late-stage clinical programs, including MarzAA, a subcutaneously (SQ) administered next-generation engineered coagulation Factor VIIa (FVIIa) for the treatment of episodic bleeding in subjects with rare bleeding disorders. Our complement pipeline includes a preclinical C3-degrader program licensed to Biogen for dry age-related macular degeneration, an improved complement factor I protease for SQ replacement therapy in patients with CFI deficiency and proteases from our ProTUNE™ C3b-C4b degrader and ImmunoTUNE™ C3a-C5a degrader platforms designed to target specific disorders of the complement or inflammatory pathways as well as other complement programs in development.

Forward-Looking Statements


This press release contains forward-looking statements that involve substantial risks and uncertainties.   Forward-looking statements include, without limitation, statements about the product candidates of Catalyst Biosciences, Inc. (the “Company”) and the benefits of its protease engineering platform; plans to complete the

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dence studies and the expectation that the studies will inform opportunities to develop CB 4332; the potential markets for and advantages of the Company’s complement product candidates, including CB 2782-PEG, CB 4332 and complement degraders; plans for the Company’s collaboration with Biogen; and plans to conduct for a Phase 1/2 clinical trial of CB 4332 in 2022.

Actual results or events could differ materially from the plans, intentions, expectations and projections disclosed in the forward-looking statements. Various important factors could cause actual results or events to differ materially, including, but not limited to, the risk that trials and studies may be delayed as a result of COVID-19, competitive products and other factors, that trials may not have satisfactory outcomes, the risk that costs required to develop or manufacture the Company’s products will be higher than anticipated, including as a result of delays in trial enrollment, development and manufacturing resulting from COVID-19 and other factors, the risk that Biogen will terminate Catalyst’s agreement, and other risks described in the “Risk Factors” section of the Company’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 6, 2021, and in other filings with the Securities and Exchange Commission. The Company does not assume any obligation to update any forward-looking statements, except as required by law.

Contact:

Ana Kapor

Catalyst Biosciences, Inc.


[email protected]