title: Long-term observation of 64 patients with roentgenographically occult lung cancer treated with external irradiation and intraluminal irradiation using low-dose-rate iridium.
abstract: OBJECTIVE
  Therapeutic results of intraluminal irradiation were analyzed in 64 patients with roentgenographically occult lung cancer (ROLC).
  
  
  METHODS
  The subjects were 64 patients who underwent intraluminal irradiation between 1987 and 2003. Radiotherapy was performed by combining external irradiation with intraluminal irradiation using low-dose-rate iridium (four 370-MBq wires) through a catheter with a spacer. The doses of radiation were 0-70 Gy (median value 46 Gy) by external irradiation and 10-60 Gy (median value 29.3 Gy) by intraluminal irradiation.
  
  
  RESULTS
  The therapeutic effect was CR in 63 patients and PR in 1 patient, and local recurrence was observed in a PR case and in seven of the 63 patients who showed CR. The 5-year overall and relapse-free survival rates were 56 (95% CI, 43-69%) and 55% (95% CI, 43-68%), respectively. Fatal pulmonary hemorrhage was observed in one case.
  
  
  CONCLUSIONS
  Considering the facts that ROLC often occurs as multiple cancers and that many patients with ROLC have reduced lung function, radiation therapy by a combination of intraluminal and external irradiation may replace surgery as the first choice for the treatment of this disease.
authors: Department of Radiation Oncology, Southern Tohoku Proton Center, Fukushima, Japan. nobufuwa@nifty.com
authors: Nobukazu
authors: N
authors: Fuwa
authors: Takeshi
authors: T
authors: Kodaira
authors: Hiroyuki
authors: H
authors: Tachibana
authors: Tatsuya
authors: T
authors: Nakamura
authors: Natsuo
authors: N
authors: Tomita
authors: Takashi
authors: T
authors: Daimon
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001918:Brachytherapy / Q000379:methods*; D001999:Bronchoscopy; D005260:Female; D006801:Humans; D007496:Iridium Radioisotopes / Q000627:therapeutic use; D008175:Lung Neoplasms / Q000473:pathology / Q000532:radiotherapy*; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009364:Neoplasm Recurrence, Local; D009378:Neoplasms, Multiple Primary / Q000532:radiotherapy; D011379:Prognosis; D011879:Radiotherapy Dosage; D016019:Survival Analysis
chemical_list: D007496:Iridium Radioisotopes