Cellectis SA said the FDA has placed a clinical hold on a phase I study of UCART-CS1A, an allogenic CAR T-cell therapy it has been testing in patients with relapsed or refractory multiple myeloma, after one person enrolled in the study died from a case of treatment-emergent cardiac arrest. Cellectis' chief medical officer, Carrie Brownstein, told BioWorld she supported the move, which formalized a decision she'd already taken with her team.