This study is evaluating how safe a type of targeted therapy (Lenvatinib) is for the treatment of children, adolescents, and young adults with relapsed or refractory cancerAn Open-Label, Multicenter Phase 2 Basket Study to Evaluate the Antitumor Activity and Safety of Lenvatinib in Children, Adolescents, and Young Adults With Relapsed or Refractory Solid Malignancies

Exclusion

• Has had major surgery within 3 weeks prior to Cycle 1 Day 1 (C1D1)
• Has gastrointestinal (GI) bleeding or active hemoptysis (bright red blood of at least half teaspoon) within 21 days prior to enrollment
• Has CNS tumors with a history of symptomatic tumor hemorrhage
• Has evidence of new intracranial hemorrhage of more than punctate size on MRI assessment obtained within 28 days prior to study enrollment
• Has radiographic evidence of encasement or invasion of a major blood vessel or of intratumoral cavitation
• Has evidence of untreated CNS metastases (exception: participants with primary CNS tumors and leptomeningeal disease.
• Has GI malabsorption, GI anastomosis, or any other condition that in the opinion of the investigator might affect the absorption of lenvatinib
• Has preexisting ≥Grade 3 GI or non-GI fistula
• Has any active infection requiring systemic therapy
• Known to be Human immunodeficiency virus (HIV) positive
• Known active viral hepatitis (B or C) as demonstrated by positive serology. Testing for hepatitis B or hepatitis C is required at screening only when mandated by local health authority
• Is currently participating and receiving study therapy, or has participated in a study of an investigational agent and received study therapy or used an investigational device within 4 weeks of the date of allocation
• Has a history or current evidence of any condition, therapy, or laboratory abnormality that might confound the results of the study, interfere with the participant's participation for the full duration of the study, or is not in the best interest of the participant to participate, in the opinion of the treating investigator
• Has known hypersensitivity to any component of the investigational product (lenvatinib or ingredients)
• Has known psychiatric or substance abuse disorders that would interfere with cooperation with the requirements of the stud
• Has clinically significant cardiovascular disease within 6 months from first dose of study intervention, including New York Heart Association Class III or IV congestive heart failure, unstable angina, myocardial infarction, cerebral vascular accident, or cardiac arrhythmia associated with hemodynamic instability
• Has non-healing wound, tumor ulceration, unhealed or incompletely healed fracture, or a compound (open) bone fracture at the time of enrollment