FGFBP2 and neoplasm: The primary tumour tissues did not show significant changes in total γδ T cell numbers; however, the tissue-resident FGFBP2 + γδ T cells were significantly enriched in MBC tumours (Fig. 5D and E), suggesting that molecular mechanisms similar to the peripheral immune system may operate in the primary tumour microenvironment (TME) to regulate the recruitment of cytotoxic γδ T cell subsets.