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Equillium Announces Oral Presentation at the Italian Society of Experimental Hematology

Translational data demonstrates itolizumab’s impact on effector T cell function in acute graft-versus-host disease

Equillium, Inc. (Nasdaq: EQ), a clinical-stage biotechnology company focused on developing novel therapeutics to treat severe autoimmune and inflammatory disorders with high unmet medical need, today announced an oral presentation at the 2022 National Congress of the Italian Society of Experimental Hematology in Rome, Italy. The presentation analyzes data from the immune reconstitution of 95 adult patients that underwent allogeneic hematopoietic cell transplantations at the Dana-Farber Cancer Institute between September 2018 and January 2020, demonstrating itolizumab’s ability to inhibit pathogenic T cell proliferation in patients with acute graft-versus-host disease (aGVHD).

“The translational work presented specifically characterizes CD6 expression levels and demonstrates the suppressive effect of itolizumab on the activity of CD4 and CD8 T cells from transplant patients with aGVHD,” said Jerome Ritz, M.D., executive director of the Connell and O’Reilly Families Cell Manipulation Core Facility at Dana-Farber Cancer Institute and professor of medicine at Harvard Medical School. “The data highlights the important role of the CD6-ALCAM pathway in modulating effector T cell function and further supports the progress into a Phase 3 study of itolizumab in first-line aGVHD.”

Itolizumab is a first-in-class anti-CD6 monoclonal antibody that selectively targets the CD6-ALCAM pathway, which plays a central role in modulating the activity and trafficking of the pathogenic T cells driving a number of immuno-inflammatory diseases.

Presentation ID:

No.14

Category:

Immunotherapy and transplantation

Abstract Title:

The Inhibition of the CD6-ALCAM Co-Stimulatory Pathway of T Lymphocytes Through the use of the Anti-CD6 Monoclonal Antibody Itolizumab for the treatment of Acute Graft-Versus-Host Disease After Hematopoietic Stem Cell Transplantation

First Author:

Benedetta Rambaldi, M.D., Research Fellow in Medicine, Dana-Farber Cancer Institute, Department of Hematologic Malignancies and Harvard Medical School

Key Highlights, Summary and Conclusions from Oral Presentation:

  • CD6+ T cells reconstituted early after transplant
  • Itolizumab inhibits T cell proliferation and activation in patients with aGVHD
  • Itolizumab demonstrates pathway specificity by inhibiting T cell proliferation in the presence of ALCAM-Fc and anti-CD3 antibody, with no effect in the presence of anti-CD3 antibody alone
  • Functional inhibition of the CD6-ALCAM pathway may be a novel therapeutic strategy for treating aGVHD, and translational data supports the recently initiated Phase 3 EQUATOR study of itolizumab in the first-line setting

The presentation is available on the Presentations page on Equillium’s website.

About Graft-Versus-Host Disease (GVHD)

GVHD is a multisystem disorder that is a common complication of allogeneic hematopoietic stem cell transplants (allo-HSCT) caused by the transplanted immune system recognizing and attacking the recipient’s body. Symptoms of GVHD include rash, itching, skin discoloration, nausea, vomiting, diarrhea, and jaundice, as well as eye dryness and irritation.

GVHD is the leading cause of non-relapse mortality in cancer patients receiving allo-HSCT, and its risk limits the number and type of patients receiving HSCT. GVHD results in high morbidity and mortality, with five-year survival of approximately 53% in patients who respond to steroid treatment and mortality as high as 95% in patients who do not respond to steroids. There are no approved treatments for first-line aGVHD. Published literature (MacMillan et al., 2015) describes background response rates to high-dose steroid administration in severe high-risk patients as 43% overall response and 27% complete response.

About Itolizumab

Itolizumab is a clinical-stage, first-in-class anti-CD6 monoclonal antibody that selectively targets the CD6-ALCAM signaling pathway to selectively downregulate pathogenic effector T cells while preserving regulatory T cells critical for maintaining a balanced immune response. This pathway plays a central role in modulating the activity and trafficking of T cells that drive a number of immuno-inflammatory diseases. Equillium acquired rights to itolizumab through an exclusive partnership with Biocon Limited.

About Equillium

Equillium is a clinical-stage biotechnology company leveraging a deep understanding of immunobiology to develop novel therapeutics to treat severe autoimmune and inflammatory disorders with high unmet medical need. The company’s pipeline consists of the following novel immunomodulatory assets targeting immuno-inflammatory pathways. Itolizumab, a first-in-class monoclonal antibody that targets the CD6-ALCAM signaling pathway which plays a central role in the modulation of effector T cells, is currently in a Phase 3 study for patients with acute graft-versus-host disease (aGVHD) and is in a Phase 1b study for patients with lupus/lupus nephritis. EQ101, a first-in-class tri-specific cytokine inhibitor that selectively targets IL-2, IL-9, and IL-15, is Phase 2 ready and expected to begin enrolling patients in an alopecia areata study in the second half of 2022. EQ102, a bi-specific cytokine inhibitor that selectively targets IL-15 and IL-21, is ready for clinical development and expected to begin enrolling patients in a Phase 1 study to include patients with celiac disease in the second half of 2022.

For more information, visit www.equilliumbio.com.

Forward Looking Statements

Statements contained in this press release regarding matters that are not historical facts are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Forward-looking statements may be identified by the use of words such as "anticipate", "believe", “could”, “continue”, "expect", "estimate", “may”, "plan", "outlook", “future” and "project" and other similar expressions that predict or indicate future events or trends or that are not statements of historical matters. Because such statements are subject to risks and uncertainties, many of which are outside of the Company’s control, actual results may differ materially from those expressed or implied by such forward-looking statements. Such statements include, but are not limited to statements regarding the potential benefit of treating patients with aGVHD or lupus/lupus nephritis with itolizumab, Equillium’s plans and expected timing for developing itolizumab including the expected timing of initiating, completing and announcing further results from the EQUATE, EQUIP, EQUALISE and EQUATOR studies, Equillium’s plans and expected timing for developing EQ101 and EQ102 including the expected timing of initiating, completing and announcing further results from Phase 2 and Phase 1 studies, respectively, the potential for any of Equillium’s ongoing or planned clinical studies to show safety or efficacy, Equillium’s anticipated timing of regulatory review and feedback, and Equillium’s plans and expected timing for developing its product candidates and potential benefits of its product candidates. Risks that contribute to the uncertain nature of the forward-looking statements include: uncertainties related to the abilities of the leadership team to perform as expected; Equillium’s ability to execute its plans and strategies; risks related to performing clinical studies; the risk that interim results of a clinical study do not necessarily predict final results and that one or more of the clinical outcomes may materially change as patient enrollment continues, following more comprehensive reviews of the data, and as more patient data become available; potential delays in the commencement, enrollment and completion of clinical studies and the reporting of data therefrom; the risk that studies will not be completed as planned; Equillium’s plans and product development, including the initiation and completion of clinical studies and the reporting of data therefrom; whether the results from clinical studies will validate and support the safety and efficacy of Equillium’s product candidates; changes in the competitive landscape; uncertainties related to Equillium’s capital requirements; and having to use cash in ways or on timing other than expected and the impact of market volatility on cash reserves. These and other risks and uncertainties are described more fully under the caption "Risk Factors" and elsewhere in Equillium's filings and reports, which may be accessed for free by visiting EDGAR on the SEC web site at http://www.sec.gov and on the Company’s website under the heading “Investors.” Investors should take such risks into account and should not rely on forward-looking statements when making investment decisions. All forward-looking statements contained in this press release speak only as of the date on which they were made. Equillium undertakes no obligation to update such statements to reflect events that occur or circumstances that exist after the date on which they were made.

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