Catalyst Biosciences Reports Second Quarter 2021 Operating

2021-08-05

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SOUTH SAN FRANCISCO, Calif., Aug. 05, 2021 (GLOBE NEWSWIRE) -- Catalyst Biosciences, Inc. (NASDAQ: CBIO) today announced its operating and financial results for the second quarter ended June 30, 2021, and provided a corporate update. "We continue to make progress in our complement and hemostasis programs. In complement, we are advancing the development of our SQ enhanced CFI development candidate, CB 4332, where we screened the first patient in our natural history study for CFI deficiency (“ConFIrm”). We also recently disclosed new proteases from our ProTUNE™; C3b-C4b degrader and ImmunoTUNE™; C3a-C5a degrader platforms designed to target specific disorders of the complement or inflammatory pathways,” said Nassim Usman, Ph.D., president and chief executive officer of Catalyst. “With the initiation of the ConFIrm study and our plans to enter the clinic with CB 4332 in 2022 on track, we are building a robust pipeline in complement. We also continue to make progress in our Crimson 1 Phase 3 registrational study of MarzAA, in hemophilia A or B with inhibitors as well as in our Phase 1/2 trial in other rare bleeding disorders.” Recent Milestones Marzeptacog alfa (activated) – MarzAA Systemic Complement Program Corporate Expected Milestones Systemic Complement Program MarzAA Second Quarter 2021 Results and Financial Highlights About Catalyst Biosciences, the Protease Medicines companyCatalyst 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 StatementsThis 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 ConFIrm and ConFIdence studies and the expectation that the studies will inform opportunities to develop CB 4332; plans to submit an IND for CB 4332; plans to announce development candidates in lead discovery programs and present PK and biomarker data for CB 4332; plans to continue enrollment of the Phase 3 and Phase 1/2 trials of MarzAA; 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 start a 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 the ConFIrm and ConFIdence trials will not validate the potential market for CB 4332; the risk Catalyst may elect to terminate or postpone ongoing development programs, including development of MarzAA or any of the Company’s complement assets; the risk that the Company will need to raise additional capital, which may not be available on faorable terms if at all; 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 KaporCatalyst Biosciences, Inc.investors@catbio.com Catalyst Biosciences, Inc.Condensed Consolidated Balance Sheets (In thousands, except share and per share amounts) Catalyst Biosciences, Inc. Condensed Consolidated Statements of Operations (In thousands, except share and per share amounts) (Unaudited)

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