Considering the relationship between PD-L1 and WNT signalling pathway activation, previous studies have indicated that PD-L1 is upregulated by WNT signalling in TNBC.31 Our data demonstrate that PD-L1 expression in the tumour is not significantly different when WNT is active (nuclear/cytoplasmic β-catenin expression) compared to inactive (membrane β-catenin staining). This evidence concerns the gene CD274 and neoplasm.