Recently, it has been shown that PD-1 also allows the identification of tumour-specific T cells in  mismatch repair-proficient gastrointestinal cancer patients.24 This finding together with our results indicates that the utility of PD-1 to select for tumour-specific T cells is not restricted to highly immune-reactive tumours.11,13,14,25. Here, PDCD1 is linked to neoplasm.