A Screening Study to Collect Samples for TAA, HLA & HLA Loss of Heterozygosity in Patients With Metastatic Solid Tumors

TScan Therapeutics is developing cellular therapies across multiple solid tumors in which autologous T cells are engineered to express a T cell receptor that recognizes tumor-associated antigens presented on specific Human Leukocyte Antigen (HLA) molecules. The purpose of this screening study is to collect samples to conduct HLA genotyping, HLA Loss of Heterozygosity (LOH) assessment, and expression of Tumor-associated Antigens (TAA) testing. These results will be used to determine if participants meet the eligibility criteria for these parameters and could potentially be enrolled in a TScan clinical study.

This multicenter screening study will be conducted to determine a participant's tumor-associated antigen expression, HLA types and loss of HLA heterozygosity status for potential enrollment in a TScan sponsored clinical study. No treatment intervention will occur as part of this screening study.

Participants will be required to provide a buccal swab to assess their HLA types and a saliva sample to assess for HLA loss of heterozygosity. For participants with an HLA type for which TScan has an open clinical study, archival tissue (less than 8 months old) will be needed to assess for tumor-associated antigen expression. If archival tissue is not available or older than 8 months, a fresh tumor biopsy will be required.