title: Lymphadenectomy extent is closely related to long-term survival in esophageal cancer.
abstract: OBJECTIVE
  The optimal extent of lymphadenectomy during esophagectomy for esophageal cancer remains debatable. The aim of this study was to identify the effect of the extent of lymphadenectomy on survival and recurrence after esophagectomy in esophageal cancer.
  
  
  METHODS
  Two hundred thirty-three patients who were operated on between January 1995 and December 2003 due to esophageal cancer were included. The study subjects were stage I, II, and III esophageal squamous cell carcinoma patients who had undergone curative resection without neoadjuvant chemotherapy or chemoradiation therapy. To analyze the extent of lymphadenectomy, lymph node stations were classified into three regions, namely, paraesophageal, upper thoracic, and abdominal regions, and patients were allocated to one of three groups, i.e., group 1 received lymphadenectomy in one region only, group 2 in two regions, and group 3 in three regions.
  
  
  RESULTS
  The pathologic stages were stage I in 57 (24.5%), IIA in 69 (29.6%), IIB in 27 (11.6%), and III in 80 (34.3%). There were 67 patients in group 1, 102 in group 2, and 64 in group 3. The operative mortality rate was 2.1%. Postoperative morbidity rates and hospital stay periods were no different for the three groups. The overall 5-year survivals in groups 1, 2, and 3 were 21.2, 36.3, and 53.7%, respectively, and there were statistically significant differences between groups (p=0.019). Overall 5-year survival for those with N0 disease was different significantly in the groups (26.7, 56.8, and 74.4% in groups 1, 2, and 3, respectively; p=0.001). However, overall 5-year survival differences for N1 disease were not significant. Group 1 showed more frequent locoregional recurrence than groups 2 and 3 (34.3 vs 12.7% and 15.6%, p=0.002). However, distant recurrence was no different in the three groups.
  
  
  CONCLUSIONS
  A wider extent of lymphadenectomy in esophageal cancer was associated with better long-term survival than limited lymphadenectomy, especially in N0 patients. In addition, increased survival was found to be inversely associated with locoregional recurrence.
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, Cancer Research Institute, Seoul National University Hospital, Clinical Research Institute, Seoul National University College of Medicine, Seoul, South Korea. chkang@snu.ac.kr
authors.forename: Chang Hyun
authors.initials: CH
authors.lastname: Kang
authors.forename: Young Tae
authors.initials: YT
authors.lastname: Kim
authors.forename: Sang-Hoon
authors.initials: SH
authors.lastname: Jeon
authors.forename: Sook-Whan
authors.initials: SW
authors.lastname: Sung
authors.forename: Joo Hyun
authors.initials: JH
authors.lastname: Kim
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002294:Carcinoma, Squamous Cell / Q000473:pathology / Q000556:secondary* / Q000601:surgery*; D004812:Epidemiologic Methods; D004938:Esophageal Neoplasms / Q000473:pathology / Q000601:surgery*; D016629:Esophagectomy; D005260:Female; D006801:Humans; D008197:Lymph Node Excision / Q000379:methods*; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D012008:Recurrence