Study Status: Completed
Recruit Status: Unknown status
Study Type: Observational
Official Title: Study of Previously Collected Blood and Tissue Samples From Patients With Nasopharyngeal Carcinoma,Laryngeal Carcinoma and Hypopharyngeal Carcinoma
Brief Summary: The aim of the study is to find for one or more serum or tissue markers of molecular biology in head and neck cancer patients used for early diagnosis, predicting prognosis and being sensitive to chemotherapy and radiotherapy