Early detection of uterine papillary serous (UPSC), clear cell (CCC), and grade 3 endometrioid carcinomas (G3EC) - all poor prognostic variants of endometrial carcinoma (EC) - is of particular clinical relevance. The study objective was to assess the utility of liquid-based cytology (Pap) in the detection of high-grade EC. A retrospective, two-institution analysis of patients diagnosed with UPSC, CCC, or G3EC with a preoperative Pap from 1999 to 2010 was conducted. One hundred and one patients were evaluated; 51.5% had UPSC, 27.7% had CCC, and 20.8% had G3EC. Stage I/II disease was found in 69.3% of patients, and 46/101 patients (45.5%) had abnormal Paps. Significantly more patients with UPSC had abnormal Paps (65.7%) than those with CCC (25%) or G3EC (23.8%; p<0.001). An abnormal Pap was the only presenting clinical finding in a significant number of asymptomatic UPSC patients (26.9%) compared with 4% of patients with CCC and G3EC (p = 0.005). On multivariate analysis, UPSC histology was the only variable associated with an abnormal Pap.
A high incidence of abnormal cervical cytology was observed in women with high-grade EC, particularly in UPSC patients. Although hypothesis generating, a proportion of asymptomatic UPSC patients had abnormal cytology, signifying that Pap smear screening may help detect the disease before the patient develops symptoms.
Abnormal cervical cytology in the diagnosis of uterine papillary serous carcinoma: earlier detection of a poor prognostic cancer subtype?