Figure 1From: Subdivision of M category for nasopharyngeal carcinoma with synchronous metastasis: time to expand the M categorization systemKaplan–Meier curves of overall survival (OS) in patients with nasopharyngeal carcinoma (NPC). a the entire cohort of NPC patient; b the liver metastasis and extra-liver metastasis groups; c,the groups with single or multiple metastatic lesions; d the groups in different M1 subcategories as proposed.Back to article page