Clinical Value and Efficacy Index of Lymphadenectomy for Thoracic Escc

The goal of this observational study is to to clarify the focus of lymph node dissection during esophagectomy.. The main question[s] it aims to answer is:provide a basis for accurate staging and the relationship between OS and lymph node dissection

Inclusion Criteria:Pathologic findings proved ESCC (8th AJCC/UICC stage T1b-4aN0-3M0)Underwent esophagecomy (two-field or three-field LN dissection)The primary tumor was thoracic ESCCExclusion Criteria:Located outside the thoracicPatients underwent salvage or R1/R2 esophagecomyThe number of resected lymph nodes (RLNs) less than 15With neoadjuvant therapy(NT) or salvage chemoradiotherapy(SCRT)