Fig. 4From: Prognostic significance of PD-L1-positive cancer-associated fibroblasts in patients with triple-negative breast cancerDouble immunofluorescence staining in triple-negative breast cancer. a α-smooth muscle actin-positive spindle cells stained in red (arrows). b PD-L1-positive spindle cells stained in green (arrows). c Two merged images of CAFs showing co-expression of α-smooth muscle actin and PD-L1 visualised in yellow (arrows) (× 400)Back to article page