Does the lobectomy plus lymph node dissection still remain a standard surgical procedure for patients with cT1N0M0 adenocarcinoma of the lung?
OBJECTIVE
Controversies still exists regarding treatment for cT1N0M0 adenocarcinoma of the lung. The following topics need to be answered: 1) Should all patients undergo lobectomy plus lymph node dissection? and 2) Is there poor-prognostic subgroup that may need adjuvant therapy?


METHODS
Between 1990 and 1999, 141 patients with cT1N0M0 adenocarcinoma of the lung underwent lobectomy plus lymph node dissection. Fifteen clinicopathological characteristics of the entire population were investigated with regard to survival. Forty-seven samples, which were possible to reexamine among 68 patients with small adenocarcinoma 2 cm or less in greatest dimension, were assessed according to Noguchi's classification.


RESULTS
Nine of fifteen clinicopathological variables were significant in indicating poor prognostic factors in univariate analysis: gender, differentiation, p-T status, p-N status, pm, lymphatic invasion, vascular invasion, pleural invasion, and serum carcinoembryonic antigen (CEA) level. The p-N status and high serum CEA level were independent predictive variables in multivariate analysis. A five-year survival rate for patients with Noguchi's type A and B was 100%. However, six (8.8%) of 68 patients with small adenocarcinoma had lymph node involvement and four patients (5.9%) had pulmonary metastasis.


CONCLUSIONS
It is inappropriate and inadequate to omit lobectomy or lymph node dissection only on the basis of tumor size. Therefore, it seems reasonable to conclude that lobectomy plus lymph node dissection still remains as a standard surgical procedure to treat cT1N0M0 adenocarcinoma of the lung. We must continue to search for new deciding factors in order to choose candidates for limited operation among patients with cT1N0M0 adenocarcinoma of the lung.
Iwamaru
Arifumi
A
Department of Surgery, National Seiran-sou Hospital, Toukai, Ibaraki, Japan.
Hato
Tai
T
Kashima
Yoshitaka
Y
Kobayashi
Masashi
M
Hashizume
Toshinori
T
Nemoto
Etsuo
E
Nishimura
Yoshihiro
Y
Morishita
Yukio
Y
Fukai
Shimao
S
D000230:Adenocarcinoma / Q000473:pathology / Q000601:surgery*; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008175:Lung Neoplasms / Q000473:pathology / Q000601:surgery*; D008197:Lymph Node Excision / Q000379:methods*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D018579:Patient Selection; D011013:Pneumonectomy / Q000379:methods*; D011379:Prognosis; D012189:Retrospective Studies; D016019:Survival Analysis; D035423:Thoracic Cavity