PRF1 and breast cancer: We found that the expression levels of Granzyme B, Perforin, FasL, TRAIL, Nkp44 and Nkp46 in Vδ1+ T cells were decreased in BC tissues compared with paired normal tissues (Supplementary Fig. S4a, b), and CD73-Vδ1 T cells expressed higher levels of these cytotoxic markers than did CD73+Vδ1 T cells (Supplementary Fig. S4c, d).