BTN2A1 and neoplasm: BTN3A1 is widely expressed in a variety of cells including immune cells and tumor cells.[66, 67] BTN3A1 expressed by APC is crucial for pAg‐induced activation of Vγ9Vδ2 T cells by forming a heterodimer with BTN2A1.[68, 69] In this study, we found that BTN3A1 is also expressed on various CC cells.