FAP and neoplasm: Epithelial FAP expression (relative to epithelium) was also significantly higher in MRI‐visible tumours (mean = 0.0027, IQR = 0.0016) compared to MRI‐invisible (mean = 0.0009, IQR = 0.0008) and benign regions (mean = 0.0008, IQR = 0.0001) (Kruskal–Wallis test, p < 0.001; Figure 3B).