Pharmaceutical UK pharma major GSK today announced that the US Food and Drug Administration (FDA) has granted Breakthrough Therapy designation for GSK5764227 (GSK’227), its B7-H3-targeted antibody-drug conjugate (ADC) being evaluated for the treatment of adult patients with relapsed or refractory osteosarcoma (bone cancer) who have progressed on at least two prior lines of therapy. 7 January 2025