In the anlotinib-pembrolizumab combination treatment group, patients with ARID1A mutation indicated a significantly survival benefit compared patient with the wide type (PFS: 12.5 VS. 7.0, P = 0.004 )...The anlotinib-pembrolizumab combination showed promising efficacy and favorable safety as treatment for refractory or recurrent High-Grade Serous Ovarian Cancer. The ARID1A are potential biomarkers for predicting the efficacy of this novel regimen.