Stage IV Nasopharyngeal Carcinoma AJCC v9

**Semantic type:** Neoplastic Process

**Definition:** Stage IV includes: IVA: (Any T, Any N, M1a); IVB: (Any T, Any N, M1b). M1a: Tumor with equal to or less than 3 metastatic lesions in one or more organs/sites. M1b: Tumor with more than 3 metastatic lesions in one or more organs/sites. (AJCC 9th ed.)