Prognostic Value and Staging Classification of Retropharyngeal Lymph Node Metastasis in Nasopharyngeal Carcinoma Patients Treated with Intensity-modulated Radiotherapy

The development of intensity-modulated radiotherapy ( IMRT) has revolutionized the management of nasopharyngeal carcinoma . The purpose of this study was to evaluate the prognostic value and classification of TNM stage system for retropharyngeal lymph node metastasis in nasopharyngeal carcinoma in the IMRT era