In ES-SCLC presenting with limited asymptomatic brain metastases and treated upfront with systemic therapy alone (carbo/etop/atezo), how would you approach the brain if MRI shows PR after a few cycles?

In our practice, we would typically watch such a patient on systemic therapy. However, we would stress the need for vigilant monitoring and likely administration of RT (SRS ideally) at the carbo/etop/atezo transition to atezo monotherapy, given the poor intracranial efficacy of the maintenance syste...