On July 29, 2026 TScan Therapeutics, Inc. (Nasdaq: TCRX), a clinical-stage biotechnology company focused on the development of T cell receptor (TCR)-engineered T cell (TCR-T) therapies for the treatment of patients with cancer, reported that the first patient has been infused with TSC-101 in the pivotal Phase 3 ALLOHA-2 trial (NCT07702578). The patient, who was enrolled in June, has now received their first infusion of TSC-101 following successful stem cell engraftment. The trial is investigating the efficacy and safety of TSC-101 for the treatment of residual disease to prevent relapse following allogeneic hematopoietic cell transplantation (allo-HCT) in patients with acute myeloid leukemia (AML) and myelodysplastic syndromes (MDS).

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"Dosing our first patient in the ALLOHA-2 study is a significant milestone for TScan. Having been a part of TScan as we moved TSC-101 from an idea to Discovery, through Phase 1 clinical development, and now to a Phase 3 study, I want to acknowledge all the hard work that went into bringing TSC-101 to this integral step and congratulate all current and previous members of the TScan team," said Gavin MacBeath, Ph.D., Chief Executive Officer. "I would also like to thank the investigators, the patients, and their families for participating in our Phase 1 ALLOHA trial. In June, we reported initial data from Cohort C of that study, in which patients were treated with our commercial-ready manufacturing process. The strong clinical efficacy and positive safety profile observed in this cohort gives us added confidence in our Phase 3 trial and future clinical development plans."

"TSC-101 has demonstrated a safety profile and clinical results that continue to excite the transplant community," said Chrystal U. Louis, M.D., Chief Medical Officer. "The pace of Cohort C enrollment highlights the growing interest in TSC-101 as a potential therapeutic option for people with AML or MDS, and we look forward to working with our investigators to address residual disease and improve survival in patients after allo-HCT."

The Phase 3 ALLOHA-2 pivotal trial is a study evaluating TSC-101 administered after standard of care HCT vs HCT alone in patients with AML or MDS. Treatment is based on biological assignment (genetic randomization), with A*02:01-positive subjects with an appropriate donor assigned to the treatment arm, and A*02:01-negative subjects, or A*02:01-posititve subjects without an appropriate donor, assigned to the control arm. All subjects will receive HCT with reduced intensity conditioning. Subjects in the treatment arm will receive two infusions of TSC-101 following engraftment. The primary endpoint for the study is relapse-free survival, and key secondary endpoints include overall survival and event-free survival.

To learn more about the ALLOHA-2 clinical trial, visit clinicaltrials.gov (identifier: NCT07702578).

(Press release, TScan Therapeutics, JUL 29, 2026, View Source [SID1234669515])