FDA reversal sinks rare-disease cell therapy after favorable reviews

An experimental cell therapy for a rare post-transplant blood cancer, developed by Atara Biotherapeutics and Pierre Fabre, was on track for FDA approval after internal reviewers recommended clearance, but the agency unexpectedly rejected it last month, citing deficient clinical data. Anonymous former agency sources say the decision may reflect leadership changes, marking a sharp reversal that disrupts a treatment expected to help roughly 500 patients in the US each year with a grim prognosis.