PD-1/ PD-l1 Inhibitors and Stereotactic Radiosurgery for Brain Metastases: a systematic review and meta-analysis

Stereotactic radiosurgery (SRS) is the treatment of choice for limited brain metastases (BM), and its combination with PD-1/PD-L1 inhibitors is hypothesized to offer synergistic therapeutic benefits. However, there are concerns regarding augmented risk of radiation-induced brain necrosis (RIBN). This systematic review and meta-analysis evaluate the efficacy and toxicity profile of PD-1/PD-L1 inhibitors combined with SRS or fractionated stereotactic radiotherapy (FSRT).