PTGER2 and cervical carcinoma: In the subgroup of cervical cancer patients with no EP3 expression (IRS score = 0, n = 45/250, 18%), the survival rate differed in the high-EP2 (n = 29/45, 64%) (Fig. 3b) and low-EP2 expression group (n = 16/45, 36%) (Fig. 3a).