CD274 and carcinoma: The rate of PD-L1 positivity in tumor cells increased from pTaG2 low grade (0.9% positive) to pTaG2 high grade (3.2%) and to pTaG3 (4.1%; p = 0.0255), and was even higher in muscle-invasive (pT2–4) carcinomas (2.1% positive for all pTa vs. 29.3% for pT2–4; p < 0.0001).