PTGER3 and neoplasm: Among 46 cases of OSCC, 15 (32.6%) cases had 76–100% (Score +4) positive tumour cells for EP3 antibody, 21 (45.7%) cases had 51–75% (Score +3) positive tumour cells, and 10 (21.7%) cases had 26–50% (Score +2) positive tumour cells (Figure 4).