A Study to Evaluate Tovorafenib in Pediatric and Young Adult Participants With Relapsed or Progressive Low-Grade Glioma and Advance Solid Tumors

Inclusion Criteria: * Low Grade Glioma \& Low-Grade Glioma Extension: a relapsed or progressive LGG with documented known activating BRAF alteration. * Advanced Solid Tumor: locally advanced or metastatic solid tumor with documented known or expected to be activating RAF fusion. * Participants must have histopathologic verification of malignancy at either original diagnosis or relapse. * Must have received at least one line of prior systemic therapy and have documented evidence of radiographic progression. * Must have at least 1 measurable lesion as defined by RANO (Arms 1 \& 2) or RECIST v1.1 (Arm 3) criteria Exclusion Criteria: * Participant's tumor has additional previously-known activating molecular alterations. * Participant has symptoms of without radiographically recurrent or radiographically progressive disease. * Known or suspected diagnosis of neurofibromatosis type 1 (NF-1) via genetic testing or current diagnostic criteria. Other inclusion/exclusion criteria as stipulated by protocol may apply