In both tumour types, uptake of [18F]AlF-mNOTA-GZP in TRs were positively correlated with CD3+, CD8+ and CD8+GZB+ TILs (Figs. 4 and 5), however, the variable levels of immune cells prevalent in the MSI high MC38 tumours, obscured the changes in T cell populations diminishing the correlation between TILs and [18F]AlF-mNOTA-GZP uptake when compared to the MSI-low CT26 tumours. Here, CD8A is linked to neoplasm.