16/02/2026 Phase 3 LIBRETTO-432 trial of adjuvant selpercatinib met the EFS endpoint in RET fusion positive NSCLC Phase 3 LIBRETTO-432 trial of adjuvant selpercatinib met the EFS endpoint in RET fusion positive NSCLC ( Ref ) Eli Lilly and Company announced positive topline results from the Phase 3 LIBRETTO-432 clinical trial of selpercatinib (Retevmo; RET kinase inhibitor) as an adjuvant therapy versus placebo in patients with early-stage (II-IIIA) RET fusion-positive NSCLC.