Anlotinib combined with durvalumab in a patient with recurrent multifocal brain metastases of small cell lung cancer after definitive concurrent chemoradiotherapy and palliative radiotherapy of the lung and brain: a case report.

The brain is a common metastatic site of small cell lung cancer (SCLC), but systematic treatment options are limited by the blood-brain barrier. Currently, the optimal treatment regimen remains controversial, especially for patients already treated by brain radiotherapy. Anlotinib is a novel oral multitarget tyrosine kinase inhibitor which has shown significant improvement in progression-free survival and overall survival in third-line or beyond therapy of advanced SCLC in a randomized, double-blind phase II study (ALTER1202 trial) based on a Chinese population sample. Emerging data has also suggested that immunotherapy, such as the programmed death ligand 1 (PD-L1) inhibitor, has a relatively high response rate in brain metastatic SCLC, although there is a lack of large sample-size studies. Integrating anlotinib and immunotherapy for recurrent or relapsing brain metastases (BMs) of SCLC has not been previously reported, but it is possible that these two treatments may have synergistic effects and provide even better outcomes. Here, we present a case of stage III SCLC who developed lung and BMs after concurrent chemoradiotherapy (cCRT) and achieved radiographic locally complete regression following whole brain irradiation (WBI) with a simultaneous integrated boost (SIB) technique. Durvalumab was delivered as maintenance therapy. Asymptomatic multifocal recurrence of BMs occurred after the administration of the second dose of durvalumab. After administration of combined durvalumab and anlotinib, the BMs achieved near-complete regression and no severe toxicity was reported. This suggests a potential synergistic effect of combined durvalumab and anlotinib in previously treated BMs in a patient with SCLC and may provide a direction for future clinical decisions.