This study aims to clarify the incidence of squamous cell carcinoma of the head and neck (SCCHN) in esophageal cancer (EC) and clinical features of SCCHN.

• 本研究的目的是要阐明头颈部鳞状细胞癌在食道癌中的发病率以及头颈部鳞状细胞癌的临床特征。