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Eur J Cardiothorac Surg 2004;25:877-883
© 2004 Elsevier Science NL
a First Department of Surgery, Hamamatsu University School of Medicine, 1-20-1 Handayama, Shizuoka, Hamamatsu 431-3192, Japan
b Division of Thoracic Oncology, National Cancer Center Hospital East, Chiba, Japan
c Pathology Division, National Cancer Center Research Institute East, Chiba, Japan
d National Institute of Health and Nutrition, Tokyo, Japan
Received 8 November 2003; received in revised form 21 January 2004; accepted 28 January 2004.
* Corresponding author. Tel.: +81-53-435-2276; fax: +81-53-435-2272
e-mail: ktakamoc{at}hama-med.ac.jp
Objectives: In 2001, we proposed the criteria for combined evaluation of the serum carcinoembryonic antigen (CEA) level and the tumor shadow disappearance rate (TDR) to predict pathologic N0 (pN0) disease in pulmonary adenocarcinomas. The objective of the present study was to determine the prognosis and histologic features in small-sized pulmonary adenocarcinomas according to serum CEA level and TDR. Methods: We reviewed clinical records of 189 consecutive patients with peripheral pulmonary adenocarcinoma 3.0 cm or smaller who underwent major lung resection and systematic lymph node dissection: 50 patients with TDR 0.8 or more and normal CEA level (group I) and 139 patients with TDR <0.8 and/or elevated CEA level (group II). Among them, we investigated histologic features of 177 adenocarcinomas according to serum CEA level and TDR. Results: The 5-year survival rates were 95% for group I and 75% for group II (P=0.002), and for pN0 patients, 97% in group I and 87% in group II (P=0.04). In univariate analyses, TDR, preoperative serum CEA level, and the maximum tumor dimension on computed tomographic (CT) scan were significantly associated with prognosis. Multivariate analysis showed that only preoperative serum CEA level and TDR were significant independent prognostic factors, and the maximum tumor dimension was not significant. Group I patients developed no local recurrence, including lymph node metastases. In 25 group I adenocarcinomas 2.0 cm or smaller, no lymph node involvement, two lymphatic permeation, two vascular invasion, and one pleural involvement tumors were observed. These signs of local invasiveness were less frequent than the remaining adenocarcinomas. CT findings correlated well with histologic findings in small-sized adenocarcinomas. Conclusions: Combined evaluation of preoperative serum CEA level and TDR may enable us to identify minimally invasive adenocarcinomas with good prognosis. Candidates for limited lung resection without systematic lymph node dissection could be selected based on these findings.
Key Words: Lung cancer • Limited surgery • Carcinoembryonic antigen • Computerized tomography scan • Adenocarcinoma
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