This is a non-randomized, phase II, open label study of apatinib mesylate tablets plus tegafur gimeracil oteracil potassium capsules induction chemotherapy in locally advanced squamous cell carcinoma of head and neck patients who were judged surgically unresectable or appropriate for non-surgical definitive therapy.The primary purpose of this study is to evaluate the efficacy of apatinib mesylate tablets plus tegafur gimeracil oteracil potassium capsules in locally advanced squamous cell carcinoma of head and neck