Parametrial Spread of Cervical Cancer in Patients with Negative Pelvic Lymph Nodes

Objective. We studied the incidence and prognostic implications of parametrial involvement according to tumor volume in a series of cervical cancer patients with negative pelvic lymph nodes. Methods. We reviewed a series of 351 node-negative patients with stage IB, IIA, or IIB cervical cancer treated with class III radical hysterectomy. The surgical specimens were processed as step-serial giant sections and tumor volume was calculated. Overall, 180 patients had tumors 20 mL. Parametrial involvement was classified as continuous, discontinuous, or involvement of blood vessels or lymph nodes and according to location as medial or lateral. A total of 302 patients had squamous cell tumors and 49 had adenocarcinomas. The mean duration of follow-up was 9.3 years. Results. Overall, 44 of 351 patients (12.5%) had parametrial involvement. The rate of parametrial involvement in patients with tumors 20 mL was 6.7, 12.5, and 33%, respectively. Isolated involvement of the medial parametrium increased with tumor size (3.8, 8.3, and 27.5%, respectively), whereas isolated involvement of the lateral parametrium was seen in 2.2, 1.6, and 0% of the cases. Involvement of both the medial and the lateral portions of the parametrium was seen in 0.5, 2.5, and 5.9% of the specimens, respectively. There were no differences in the rate of parametrial involvement between squamous cell carcinomas and adenocarcinomas. The 5-year disease-free survival rates in patients without or with parametrial involvement were 90.2% vs 90%, 91.7% vs 92.9%, and 84.7% vs 67%, respectively. Conclusion. The lateral portion of the parametrium can be involved in patients with cervical cancer and negative pelvic lymph nodes, but this is uncommon. In this series of patients treated with type III radical hysterectomy, parametrial involvement had no influence on disease-free survival.