Single-agent expansion cohort of lenvatinib (LEN) and combination dose-finding cohort of LEN + etoposide (ETP) + ifosfamide (IFM) in patients (pts) aged 2 to ≤25 years with relapsed/refractory osteosarcoma (OS).

11527Background: LEN is a multikinase inhibitor of VEGFR1-3, FGFR1-4, PDGFRα, KIT, and RET. In human pediatric OS xenograft models, LEN enhanced the antitumor activity of IFM + ETP. In a phase (Ph)...