Based on previous studies, BTN3A molecules (also termed CD277), are expressed in different types of immune cells, including T cells, natural killer cells, dendritic cells, and monocytes [17,18,19], and some cancers, such as ovarian cancer, gastric cancer, pancreatic cancer, breast cancer, and colorectal cancer [20,21,22,23,24]. The gene discussed is BTN3A2; the disease is breast cancer.