Exhibit 99.1 Adaptimmune Reports Q4 /Full Year 2023 Financial Results and Business Updates U.S. FDA accepted BLA for afami-cel for the treatment of advanced synovial sarcoma with priority review and a PDUFA date of August 4th, 2024 Confirmatory evidence for afami-cel full approval agreed with FDA; will use data from Cohort 2 of pivotal SPEARHEAD-1 trial, which is fully enrolled Company is targeting launch of afami-cel upon receipt of FDA approval with commercial, manufacturing, and supply chain teams prepar ...