“…However, it remains unclear whether it is justified to reserve WBRT for patients with overt recurrence after complete response to initial chemotherapy. As, especially in younger patients, toxicity of radiotherapy is mild, moderate doses of radiotherapy might optimize the therapeutic benefit in PCNSL patients with complete response to chemotherapy, as it has been recently demonstrated in extracerebral lymphomas [17,21,33,39]. Up to now, intrathecal chemotherapy has not found a defined role in the primary treatment of PCNSL [16].…”