title: The oncological outcomes of segmentectomy in clinical-T1b lung adenocarcinoma with a solid-dominant appearance on thin-section computed tomography.
abstract: OBJECTIVE
  We investigated the surgical outcomes of clinical-T1b lung adenocarcinomas patients whose tumors had a solid-dominant radiological appearance and who were treated with segmentectomy or lobectomy.
  
  
  METHODS
  We examined 154 surgically resected clinical-T1b lung adenocarcinomas with a "solid-dominant" appearance on thin-section computed tomography (CT). The preoperative thin-section CT images of all cases were reviewed. "Solid-dominant" was defined as 0.5≤ consolidation/tumor ratio (CTR) <1.0.
  
  
  RESULTS
  Pathological nodal metastasis, lymphatic invasion, vascular invasion, and pleural invasion were found in 7 (4.5 %), 27 (18 %), 21 (14 %), and 15 (10 %) patients with clinical-T1b solid-dominant lung adenocarcinoma, respectively. Lobectomy and segmentectomy were performed in 123 (80 %) and 31 (20 %) cases, respectively. The 3-year overall survival (OS) and relapse-free survival (RFS) of patients with clinical-T1b solid-dominant lung adenocarcinoma were 95.5 and 92.4 %, respectively. The 3-year RFS and OS did not differ significantly between the patients who underwent lobectomy or segmentectomy (3-year RFS, 92.3 vs. 93.4 %, p = 0.8713; 3-year OS, 95.3 vs. 96.6 %, p = 0.7603). Segmentectomy was not found to be a prognostic factor for RFS (p = 0.8714), or OS (p = 0.7613).
  
  
  CONCLUSIONS
  Segmentectomy can achieve acceptable oncological outcomes (both in terms of OS and RFS), which are similar to those achieved with standard lobectomy, in patients with clinical-T1b solid-dominant lung adenocarcinoma.
authors.affiliation: Department of General Thoracic Surgery, Juntendo University School of Medicine, 1-3, Hongo 3-chome, Bunkyo-ku, Tokyo, 113-8431, Japan.
authors.forename: Aritoshi
authors.initials: A
authors.lastname: Hattori
authors.affiliation: Department of General Thoracic Surgery, Juntendo University School of Medicine, 1-3, Hongo 3-chome, Bunkyo-ku, Tokyo, 113-8431, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Matsunaga
authors.affiliation: Department of General Thoracic Surgery, Juntendo University School of Medicine, 1-3, Hongo 3-chome, Bunkyo-ku, Tokyo, 113-8431, Japan.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Takamochi
authors.affiliation: Department of General Thoracic Surgery, Juntendo University School of Medicine, 1-3, Hongo 3-chome, Bunkyo-ku, Tokyo, 113-8431, Japan.
authors.forename: Shiaki
authors.initials: S
authors.lastname: Oh
authors.affiliation: Department of General Thoracic Surgery, Juntendo University School of Medicine, 1-3, Hongo 3-chome, Bunkyo-ku, Tokyo, 113-8431, Japan. kjsuzuki@juntendo.ac.jp.
authors.forename: Kenji
authors.initials: K
authors.lastname: Suzuki
mesh_terms: D000230:Adenocarcinoma / Q000000981:diagnostic imaging* / Q000401:mortality / Q000601:surgery*; D000368:Aged; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging* / Q000401:mortality / Q000601:surgery*; D008297:Male; D008875:Middle Aged; D011013:Pneumonectomy / Q000379:methods*; D049268:Positron-Emission Tomography; D012189:Retrospective Studies; D015996:Survival Rate; D014057:Tomography, X-Ray Computed; D016896:Treatment Outcome
keywords: Clinical-T1b tumor; Invasive lung adenocarcinoma; Segmentectomy; Survival