On December 11, 2023 Cimeio Therapeutics, the leading biotechnology company in the field of epitope shielding, reported data for its CD45 and CD33 programs during this weekend’s American Society of Hematology (ASH) (Free ASH Whitepaper) meeting in San Diego (Press release, Cimeio Therapeutics, DEC 11, 2023, View Source [SID1234638466]). The two studies provide further evidence that epitope editing allows for the development of powerful immunotherapies that would not be safe to administer without first protecting healthy cells.
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The first abstract, titled "Hematopoietic Stem Cells Expressing Engineered CD45 Enable a Near Universal Targeted Therapy for Hematologic Diseases," demonstrated the efficacy of Cimeio’s proprietary CD45 targeting ADC (CIM053-ADC) at depleting an aggressive AML cancer cell line in vivo, while the CD45 engineered HSCs were fully protected, engrafted and reconstituted the hematopoietic system in humanized mice. After just two doses of CIM053-ADC, all mice were cancer-free while the healthy hematopoietic cells were unaffected. This study demonstrates the potential of CD45-targeted ADC therapy for patients with hematologic malignancies.
The second abstract, titled "Base Edited HSPCs Are Shielded From CD33 Therapy but Preserve CD33 Expression," showed how Cimeio’s CD33 shielding variant effectively protected cells from a CD33 antibody, while maintaining CD33 expression. CD33 is a useful target for AML and other diseases of HSCs.
Collectively, these studies further underscore the potential for Cimeio’s therapies, when coupled with its shielding technology, to transform the treatment of hematologic malignancies, genetic, and autoimmune diseases.
"AML patients who have residual disease at the time of a bone marrow transplant have a high risk for relapse," said Corey Cutler, M.D., M.P.H., Medical Director of the Stem Cell Transplantation Program at the Dana Farber Cancer Institute and Professor of Medicine at Harvard Medical School. "An effective therapy that could be given post-transplant to treat residual disease and prevent relapse, but would not affect the newly transplanted cells, would be a real advancement in the way we treat AML. Bone marrow transplant has the potential to cure patients of their leukemia, and improving upon this approach through epitope shielding and novel post-transplant therapies is an exciting possibility."