TEST:

Tempus HLA-LOH assay

P | "Clinical Trial Registration Number: NCT04981119"

The primary objective of phase 1 is to evaluate the safety and tolerability of A2B530 in patients with NSCLC, CRC, and PANC, and to identify the maximum tolerated dose and recommended phase 2 dose (RP2D). The dose-expansion phase will confirm RP2D and collect biomarker data to further characterize A2B530.

Importantly, HLA-A/B/C alleles were almost always lost together, indicating that HLA loss most frequently occurs through haplotype loss, informing a strategy to direct multiplexed TCR-T to the remaining HLA haplotype. Conclusions Overall, these data highlight the importance of a multiplexed TCR-T cell therapy targeting various intact tumor antigens presented on intact HLA alleles in order to effectively address solid tumors.

BASECAMP-1 is an ongoing prescreening study to: 1) Identify patients with tumor-associated HLA LOH and eligible for Tmod CAR T-cell therapy, and 2) Obtain leukapheresis in preparation for the autologous CAR T-cell therapy trials EVEREST-1 (A2B530 targeting carcinoembryonic antigen; NCT05736731) and EVEREST-2 (A2B694 targeting mesothelin). We have identified 52 patients across sites with study-specific disease types with HLA-A*02:01 LOH; of these, 13 are currently being screened, 23 have been found ineligible, and 16 have consented. This demonstrated the feasibility of leveraging a diagnostic during routine clinical workup to identify rare, molecularly defined patients for personalized clinical studies.

"Tempus...announced that the U.S. Food & Drug Administration (FDA) has granted the company Breakthrough Device Designation for its HLA-LOH assay as a companion diagnostic (CDx) test. The test uses a machine learning model to analyze sequence data produced by Tempus’ FDA-approved, next generation sequencing-based xT CDx assay. It is intended to identify cancer patients with solid tumors who may benefit from treatment with specific targeted therapies when a patient’s tumor has experienced allele-specific loss of heterozygosity (LOH) for specific human leukocyte antigen (HLA) Class I alleles."