How would you approach a patient with recurrent grade 3 oligodendroglioma (MGMT-methylated, IDH mutant, 1p/19q co-deleted) 1 year after gross total resection and adjuvant chemotherapy and radiation?  

There are multiple options to consider for the recurrence of grade 3 gliomas after prior chemotherapy or radiation. Regardless of whether or not the recurrence overlaps completely or partially with the prior treatment fields, options include systemic therapy (including IDH-targeted therapies for IDH...