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Chimeric Antigen Receptor T Cells (CART) Therapy in Digestive system tumors

ABSTRACT: Interventions: experimental group:CART cells Primary outcome(s): PET CT Study Design: Single arm

DISEASE(S): Digestive Tract Tumors, Including Colorectal Cancer, Gastric Cancer, Pancreatic Cancer, Esophageal Adenocarcinoma, Esophagogastric Junction Cancer, Etc

PROVIDER: 2703051 | ecrin-mdr-crc |

REPOSITORIES: ECRIN MDR

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Effect of Cryopreservation on Autologous Chimeric Antigen Receptor T Cell Characteristics

Project description:As clinical applications for chimeric antigen receptor T cell (CART) therapy extend beyond early phase trials, commercial manufacture incorporating preservation steps becomes a logistical necessity. The effect of cryopreservation on CART characteristics is unclear. We retrospectively evaluated the effect of cryopreservation on product release criteria and in vivo characteristics in 158 autologous CART products from 6 single-center clinical trials. Further, from 3 healthy donor manufacturing runs, we prospectively identified differentially expressed cell surface markers and gene signatures among fresh versus cryopreserved CARTs. Within 2 days of culture initiation, cell viability of the starting fraction (peripheral blood mononuclear cells [PBMNCs]) decreased significantly in the cryo-thawed arm compared to the fresh arm. Despite this, PBMNC cryopreservation did not affect final CART fold expansion, transduction efficiency, CD3%, or CD4:CD8 ratios. In vivo CART persistence and clinical responses did not differ among fresh and cryopreserved final products. In healthy donors, compared to fresh CARTs, early apoptotic cell-surface markers were significantly elevated in cryo-thawed CARTs. Cryo-thawed CARTs also demonstrated significantly elevated expression of mitochondrial dysfunction, apoptosis signaling, and cell cycle damage pathways. Cryopreservation during CART manufacture is a viable strategy, based on standard product release parameters. The clinical impact of cryopreservationrelated subtle micro-cellular damage needs further study

2020-10-03 | GSE158929 | GEO

Dasatinib enhances anti-tumor efficacy of chimeric antigen receptor T cells by inhibiting cell differentiation and exhaustion

Project description:CD19-targeted Chimeric antigen receptor T cells (CART) cells have shown remarkable promise in various B cell malignancies. Sustained tonic signaling and antigen exposure drives CART cell differentiation and exhaustion, which limits the therapeutic potency and persistence of CART cells and is a major cause of CD19-expressing leukemia relapse after CD19-targeted CART cells treatment in ALL. Here, we systematically screened FDA approved tyrosine kinase inhibitors, and identified dasatinib as the best candidate to prevent or reverse both CD28/CART and 4-1BB/CART cells from differentiation and exhaustion during ex vivo expansion, which enhanced the therapeutic efficacy and in vivo persistence. Using RNA-seq, we identified the differentially expressed genes between dasatinib treated group and Nalm6 stimulated group, and found that memory-associated transcription factors TCF7 and naive/memory-associated cell surface marker CCR7 were upregulated, whereas exhaustion-related regulators (NR4A1, BATF3, ATF4 and FOS) and inhibitory receptors (PD1, LAG3) were down-regulated in dasatinib treated CAR T cells. Moreover, T cell activation associated signaling pathways (T cell receptor, Jak-STAT, MAPK and PI3K-Akt) which were upregulated in Nalm6 stimulated CART cells, showed fundamental downregulation in dasatinib treated CART cells. These findings imply that dasatinib played important roles in CART cell differentiation and exhaustion by inhibition of T cell activation pathways.

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