CXCL9 expression analysis in ovarian cancer subtypes and correlation to reported ICB response....CXCL9 overexpression resulted in T-cell accumulation, delayed ascites formation and improved survival, which was dependent on adaptive immune function….anti-PD-L1 treatment acted synergistically with Cxcl9 overexpression and significantly prolonged time to onset of ascites (median 51 vs. 45 days; P = 0.003) and overall survival (median 57 vs. 52 days; P = 0.007) in the Cxcl9+ tumour group (Fig. 2d).