CD274 and breast cancer: To determine if tumor cell‐intrinsic PD‐L1 mTOR effects were subtype‐dependent, we used PD‐L1 shRNAs to generate PD‐L1lo UM‐UC‐3 (basal‐mesenchymal/claudin‐low)22 and UM‐UC‐14 human (luminal)21 BC cell lines (Figure S2) for comparison to studies in luminal human RT4 BC.23