CD274 and melanoma: Dammeijer et al. demonstrated in murine models of mesothelioma, melanoma and pancreatic adenocarcinoma that TDLNs contain tumour specific PD-1+ T cells co-localising with PD-L1 expressing myeloid cells, including CD11c+ conventional dendritic cells (cDCs) (Dammeijer et al., 2020).