CD4 and neoplasm: In distant tumours, the percentage of infiltrating CD45+ leukocytes (Fig. 7b and Supplementary Fig. 20b) and CD4+ T cells (Fig. 7c and Supplementary Fig. 20c) with respect to the total number of cells in the tumours were significantly increased in mice treated by PDT of NCP@pyrolipid with anti-PD-L1.