- ≥ 4 weeks if immediately preceding treatment was chemotherapy/targeted therapy administered every 3 weeks Previously received at least one CNS directed treatment (such as surgery or radiation) OR not be eligible for CNS stereotactic radiosurgery Measurable CNS disease, either previously untreated (not counting systemic therapy), or progressed following previous radiation treatment. Lesions that have progressed after prior radiosurgery should not be selected as measurable disease if they are suspected of being radionecrosis.