Results
2833 patients who were diagnosed with a hypo-pharyngeal cancer between January 1, 2010, and December 31, 2014 were identified. Patients whose lung metastases status at diagnosis were unknown, not applicable or patients who didn’t record follow-up times were excluded; leaving 2714 patients in the final cohort. The median age was 64 years (IQR: 57 to 73 years), 81.2% were men, the majority race was Caucasian (69.5%) and the median follow-up time was 12 months (IQR: 5 to 26 months). Among them, 48.8% of patients’ tumors occurred in the pyriform sinus, while 51.2% patients were in the post-cricoid region and posterior wall of the pharynx. The median tumor size was 30mm (IQR: 21 to 44mm), and categorized into three groups: < 10 mm(1.7%), 10-30mm(31.2%), and >30mm(32.2%). 171 patients were identified to have metastases at least in one site, such as lung (128, 4.7%), liver (28, 1.0%), bone (46, 1.7%) or brain (7, 0.3%). Among the entire cohort, most of the patients were grade II/III(1053,38.8% / 884 ,32.6%)(Table 1).