Company: CERO
Filing Date: 2025-12-05
Form Type: S-1
Source: 0001213900-25-118817
Chunk: 163

Company: CERO THERAPEUTICS HOLDINGS, INC.
Filing Date: 2025-12-05
Form: S-1
Chunk 163
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 effector cell types, including NK cells and macrophages, are in earlier stages of clinical development and have only recently entered clinical trials. To date, no CAR-based therapies that employ NK cells or macrophages have received FDA approval. There are at present no FDA approved CAR T cell products for the treatment of AML. 92 The Limitations of Current CAR-T Technology Much of the excitement of cellular therapy surrounds the curative potential of adoptive transfer of genetically engineered T cells. Adoptively transferred T cells proliferate upon their engagement with target antigens and represent a form of therapy that can be appropriately characterized as living and expanding. Efficient targeted killing and tumor elimination may be achieved in a short period of time. However, multiple barriers limit the efficacy of conventional CAR-T cell therapy. A high rate of side effects often accompany treatment with currently approved products, especially in those patients with high tumor burdens. In addition, partial responses occur, often associated with immune escape of the tumor from the CAR or the display by the T cells of an exhaustion phenotype. Moreover, while engineered CAR-T cells have shown remarkable potential in the treatment of hematological cancers, they have not demonstrated equivalent efficacy in the treatment of solid tumors. Curative CAR-T cell therapies for solid tumors currently do not exist and the importance of this limitation is underscored by the prevalence of solid tumor malignances. The American Cancer Society estimates that solid tumor cancers accounted for more than 1.7 million of the 1.9 million people newly diagnosed with cancer in 2021. Even in hematological malignancies with approved CAR-T cell therapies, less toxic orthogonal treatment approaches are needed as cure rates for CD19-targeted CAR-T cell therapies do not exceed 60%. Challenges to the use of cellular therapy to address solid tumors often relate to difficulty in developing receptors directed towards targets expressed in high frequency on cancer cells as well as overcoming the immunosuppressive microenvironments that contribute to ineffective immune responses. The tumor stroma, made up of a dense fibrotic matrix, often surrounds solid tumors and acts as a physical barrier, which restricts CAR-T cell access to the tumor. CAR-T cell activity may be further hindered by the tumor microenvironment (“TME”). In the TME, multiple cell types which drive immunosuppression infiltrate solid tumors, including myeloid-derived suppressor cells, tumor-associated macrophages, and regulatory T cells. The interaction of these cells and the tumor cells increases the expression of signaling molecules that enable tumor cell proliferation while dampening the generation