BTN3A1 and neoplasm: BT3 molecules (BTN3A1/BT3.1, BTN3A2/BT3.2 and BTN3A3/BT3.3) are known to be expressed on endothelial cells [10], in the membrane layer surrounding milk fat-secreting droplet from mammary epithelial cells [11], on immune cells, and on some tumor cell lines [5], [12].