However, while T cells can be readily detected in the spleens of Il7r−/− tumour-bearing mice (Supplementary Fig. 4A), we detected very few T cells in the tumours of Il7r−/− mice (Fig. 5h), suggesting a role for IL-7R signalling in T-cell trafficking into tumour and/or survival of T cells in tumour. This evidence concerns the gene IL7R and neoplasm.