CD274 and neoplasm: Weak negative correlations were observed between ECM remodelling and PD‐L1 in both tumour (R = ‒.28, p = .044) and macrophage regions (R = ‒.26, p = .039), as well as between complement activation and PD‐L1 in tumour regions (R = ‒.24, p = .08) (Figure S10).