TScan Therapeutics is developing cellular therapies across multiple solid tumors in which autologous participant-derived T cells are engineered to express a T cell receptor that recognizes cancer-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) 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 treatment study.