—ABATE Phase 2 Trial Aims to Further Assess Safety and Establish Biological and Clinical
Proof-of-Concept for CM-101 as a Potential Treatment for Patients with Systemic Sclerosis—

TEL AVIV, Israel I February 21, 2023 I Chemomab Therapeutics, Ltd. (Nasdaq: CMMB) (Chemomab), a clinical-stage biotechnology company focused on the discovery and development of innovative therapeutics for fibro-inflammatory diseases with high unmet need, today announced U.S. Food and Drug Administration (FDA) clearance of the company’s Investigational New Drug (IND) Application to evaluate CM-101 in a Phase 2 trial in adults with systemic sclerosis (SSc).

CM-101 is a first-in-class monoclonal antibody designed to interfere with key biological pathways associated with SSc and other serious fibro-inflammatory diseases. In preclinical studies, CM-101 reduced inflammatory and fibrotic injury to the lung, skin and vasculature—organ systems often affected in SSc patients. In early clinical trials, CM-101 was well-tolerated, reducing fibrogenesis-related biomarkers and demonstrating anti-inflammatory effects in patients with severe lung inflammation, non-alcoholic fatty liver disease (NAFLD) and non-alcoholic steatohepatitis (NASH). CM-101 has been granted Orphan Drug designation by the FDA for SSc and for primary sclerosing cholangitis (PSC), a rare liver disease. The CM-101 Phase 2 SPRING trial in PSC patients is currently ongoing.

Matt Frankel, MD, Chief Medical Officer of Chemomab, said, “Achieving FDA clearance to initiate our Phase 2 systemic sclerosis trial is an important milestone for Chemomab. We are encouraged by the results of recent clinical studies of CM-101 in COVID patients with SSc-like acute lung injury and in NASH patients, which showed consistent trends in reducing multiple biomarkers associated with fibro-inflammatory disease. We believe that CM-101 has the potential to become the first disease-modifying treatment for this debilitating condition that is thought to be the most lethal of the systemic rheumatic disorders. We look forward to initiating patient enrollment in the first half of this year.

Francesco Del Galdo, MD, PhD, Professor of Experimental Medicine at the University of Leeds in the U.K. and Head of the Scleroderma Programme at the Leeds Institute of Rheumatic and Musculoskeletal Medicine, is the Principal Investigator of the Chemomab systemic sclerosis trial.

Professor Del Galdo noted, Preclinical studies conducted by me and my colleagues show that CCL24, the disease target of CM-101, appears to be a key driver of the immune-driven fibrosis affecting tissues including the lung, skin and blood vessels that are key aspects of SSc pathology. Our patients and we, as their physicians, urgently need an effective therapy able to treat the multiple manifestations of scleroderma. I welcome the opportunity to help launch and coordinate this innovative clinical trial for patients with SSc in the U.S., Europe and Israel, scheduled to open later this year.”

About the CM-101 Phase 2 Systemic Sclerosis Study─the ABATE Trial
The ABATE trial (a Phase 2, multicenter, randomized, double-blind, proof-of-biology study to evaluate the SAfety, ToleraBility, and Activity of CM-101 in Patients with SysTEmic Sclerosis) will enroll 45 patients with clinically active dermatologic, vascular or pulmonary SSc. The study population is expected to be roughly split between patients with diffuse cutaneous SSc and patients with limited SSc. The trial is designed to further assess safety and establish biological and clinical proof-of-concept for CM-101 as a potential treatment for patients with SSc. The primary outcome measure is safety. Secondary endpoints include multiple serum-based biological markers and a variety of exploratory biological and clinical outcomes, including the American College of Rheumatology Composite Response Index in Systemic Sclerosis (ACR-CRISS) score and its revisions (rCRISS). The trial includes a 24-week double blind period during which active treatment patients will receive 10 mg/kg of CM-101 by intravenous infusion every three weeks, followed by a 24-week open label extension, where all patients will receive a 10 mg/kg dose. The trial also includes multiple clinical assessments of the skin, vasculature and pulmonary function. It is expected to generate additional information about disease mechanisms, provide data relevant to future patient stratification strategies and inform the selection of appropriate endpoints for future studies. A top-line data read-out is planned for the second half of 2024.

About Systemic Sclerosis
Systemic sclerosis, also known as scleroderma, is a rare autoimmune rheumatic disease characterized by fibrosis and inflammation of the skin, joints and internal organs, as well as vascular abnormalities. It predominantly affects women and is typically diagnosed when patients are between 30 and 50 years old. It is considered the most lethal of the systemic rheumatic diseases with a median survival of only 10 years. There is no approved disease-modifying drug for the disease. Current estimates from the Scleroderma Foundation suggest there are approximately 100,000 systemic sclerosis patients in the U.S.

About Chemomab Therapeutics 
Chemomab is a clinical stage biotechnology company focusing on the discovery and development of innovative therapeutics for fibrotic and inflammatory diseases with high unmet need. Extensive preclinical data showing the unique and pivotal role of the soluble protein CCL24 in promoting fibrosis and inflammation led Chemomab to develop CM-101, a monoclonal antibody designed to bind and block CCL24 activity. CM-101 has demonstrated the potential to treat multiple severe and life-threatening fibrotic and inflammatory diseases. A Phase 2 liver fibrosis biomarker study in NASH patients was recently completed and a Phase 2 trial in primary sclerosing cholangitis patients is ongoing. Chemomab expects to begin enrolling patients in a Phase 2 trial in systemic sclerosis in the first half of 2023. For more information on Chemomab, visit chemomab.com.

SOURCE: Chemomab Therapeutics