The goal of this observational study is to assess the safety and efficacy of submental artery island flap (SMAIF) in the reconstruction of laryngeal and hypopharyngal defects after the surgical resection of hypopharyngeal cancer. The main questions it aims to answer are: * The survival of SMAIF and the recovery of laryngeal function. * The oncologic outcomes of SMAIF comparing with other reconstructions or radiotherapy. Participants will underwent partial laryngectomy and hypopharyngectomy and reconstruction of SMAIF. Postoperative adjuvant radiotherapy will be recommented when adverse pathologic features were noted.