title: Assessment of node dissection for clinical stage I primary lung cancer by VATS.
abstract: OBJECTIVE
  The feasibility of systematic node dissection (SND) for stage I primary lung cancer by video-assisted thoracic surgery (VATS) remains controversial. The aim of this study was to assess the feasibility of SND by VATS.
  
  
  METHODS
  Four hundred and eleven patients with clinical stage I primary lung cancer were enrolled in this study. Two hundred and twenty-one patients, VATS group, underwent a major pulmonary resection with SND by VATS through a minithoracotomy (30-70mm) and two access ports; 190 patients, open thoracotomy (OT) group, did so through anterolateral thoracotomy. The two groups were compared regarding clinical data including number of dissected nodes in each nodal station for evaluating the feasibility of SND by VATS.
  
  
  RESULTS
  In the right side, the total number (N) of nodes dissected (VATS 31 vs OT 31, P=0.899), N of mediastinal nodes dissected (20 vs 21, P=0.553), and N of dissected nodes in each nodal station were similar between the two groups. In the left side, total N of nodes dissected (28 vs 27, P=0.714), N of mediastinal nodes dissected (16 vs 17, P=0.333), and N of dissected nodes in each nodal station were similar between the two groups. There were three (1.4%) and five (2.6%) operation related deaths in the VATS group and OT group, respectively (P=0.48). Chest tube duration was shorter in the VATS group than the OT group (5.8 vs 7.6 days, P=0.001). The incidences of chylothorax, recurrent laryngeal nerve injury and pleural effusion requiring thoracentesis after surgery were similar between the two groups (3 vs 4, P=0.709; 5 vs 3, P=0.480, 3 vs 8, P=0.122). The 5-year actuarial recurrence-free survival rate and cumulative survival rate of pathological stage IA cases were similar between the two groups (88.6 vs 92.4%, P=0.698; 92.9 vs 86.5%, P=0.358).
  
  
  CONCLUSIONS
  The SND by VATS was as technically feasible as SND through OT regarding number of dissected nodes and morbidity. It seems acceptable as an oncological treatment for clinical stage I lung cancer.
authors.affiliation: Department of Thoracic and Cardiovascular Surgery, Sapporo Medical University School of Medicine, South 1, West 16, Chuo-ku, Sapporo 060-8543, Japan. atsushiw@sapmed.ac.jp
authors.forename: Atsushi
authors.initials: A
authors.lastname: Watanabe
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Koyanagi
authors.forename: Takuro
authors.initials: T
authors.lastname: Obama
authors.forename: Hisayoshi
authors.initials: H
authors.lastname: Ohsawa
authors.forename: Tohru
authors.initials: T
authors.lastname: Mawatari
authors.forename: Noriyuki
authors.initials: N
authors.lastname: Takahashi
authors.forename: Yasunori
authors.initials: Y
authors.lastname: Ichimiya
authors.forename: Tomio
authors.initials: T
authors.lastname: Abe
mesh_terms: D000230:Adenocarcinoma / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D000368:Aged; D004322:Drainage; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000401:mortality / Q000473:pathology / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D010996:Pleural Effusion; D011013:Pneumonectomy; D011183:Postoperative Complications; D021701:Sentinel Lymph Node Biopsy / Q000379:methods*; D015996:Survival Rate; D020775:Thoracic Surgery, Video-Assisted; D013908:Thoracotomy