CXCR4 and melanoma: In addition, by analyzing a public dataset of CD8 T cells obtained by melanoma patients treated with ICI (see “Methods”)10, we found that MAIT cells increased in the metastatic lesions regressing after ICI compared to those that did not regress compared to baseline, thereby suggesting the potential recruitment of CXCR4-expressing MAIT cells expanding in the circulation (Supplementary Fig. 7, bottom).