HLA-A and breast cancer: In the context of breast cancer, BAP31 expression showed a positive correlation with TAPBP (r = 0.257, p = 6.55 × 10−18), HLA-A (r = 0.16, p = 9.81 × 10−8), and HLA-C (r = 0.146, p = 1.25 × 10−6).