Journal of Chest Surgery

The Korean Society for Thoracic and Cardiovascular Surgery (대한심장혈관흉부외과학회)
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Patterns of Mediastinal Lymph Nodes Metastasis in Non-small Cell Lung Cancer according to the Primary Cancer Location

원발성 비소세포성 폐암의 폐엽에 따른 종격동 림프절 전이 양상

  • Lee, Kyo-Sean (Department of Thoracic and Cardiovascular Surgery, Chonnam National University Hospital, College of Medicine, Chonnam National University) ;
  • Song, Sang-Yun (Department of Thoracic and Cardiovascular Surgery, Chonnam National University Hwasun Hospital, College of Medicine, Chonnam National University) ;
  • Ryu, Sang-Woo (Department of Thoracic and Cardiovascular Surgery, Chonnam National University Hospital, College of Medicine, Chonnam National University) ;
  • Na, Kook-Ju (Department of Thoracic and Cardiovascular Surgery, Chonnam National University Hospital, College of Medicine, Chonnam National University)
  • 이교선 (전남대학교 의과대학 전남대학교병원 흉부외과학교실) ;
  • 송상윤 (전남대학교 의과대학 화순전남대학교병원 흉부외과학교실) ;
  • 류상우 (전남대학교 의과대학 전남대학교병원 흉부외과학교실) ;
  • 나국주 (전남대학교 의과대학 전남대학교병원 흉부외과학교실)
  • Published : 2008.02.05
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Abstract

Background: The presence of infiltrated mediastinal lymph nodes is a crucial factor for the prognosis of lung cancer. The aim of our study is to investigate the pattern of metastatic non-small cell lung cancer that spreads to the mediastinal lymph nodes, in relation to the primary tumor site, in patients who underwent major lung resection with complete mediastinal lymph node dissection. Material and Method: We retrospectively. studies 293 consecutive patients [mean age $63.0{\pm}8.3$ years (range $37{\sim}88$) and 220 males (75.1%)] who underwent major lung resection due to non-small cell lung cancer from January 1998 to December 2005. The primary tumor and lymph node status was classified according to the international TNM staging system reported by Mountain. The histologic type of the tumors was determined according to the WHO classification. Fisher's exact test was used; otherwise the chi-square test of independence was employed. A p-value < 0.05 was considered significant. Result: Lobectomy was carried out in 180 patients, bilobectomy in 50, sleeve lobectomy in 10 and pnemonectomy in 53. The pathologic report revealed 124 adenocarcinomas, 138 squamous-cell tumors, 14 adenosquamous tumors, 1 carcinoid tumor, 8 large cell carcinomas, 1 carcinosarcoma, 2 mucoepidermoid carcinomas and 5 undifferentiated tumors. The TNM stage was IA in 51 patients, IB in 98, IIB in 41, IIIA in 71, IIIB in 61 and IV in 6. 25.9 % of the 79 patients had N2 tumor. Most common infiltrated mediastinal lymph node was level No.4 in the right upper lobe, level No. 4 and 5 in the left upper lobe and level No. 7 in the other lobes, but no statistically significant difference was observed. Thirty-six patients (12.3%) presented with skip metastasis to the mediastinum. Conclusion: Mediastinal lymph node dissection is necessary for accurately determining the pTNM stage. It seems that there is no definite way that non-small cell lung cancer spreads to the lymphatics, in relation to the location of the primary cancer. Further, skip metastasis to the mediastinal lymph nodes was present in 12.3% of our patients.

배경: 원발성 비소세포성 폐암에서 종격동 림프절 전이는 중요한 예후인자 중의 하나이다. 이 연구는 원발성 비소세포성 폐암으로 수술 받은 환자에서 폐엽에 따른 종격동 림프절 전이 양상을 파악하여 적극적인 종격동 림프절 절제술을 시행하고 그로 말미암아 병기 결정에 도움이 되고자 시행하였다. 대상 및 방법: 1998년 1월부터 2005년 12월까지 원발성 폐암으로 완전한 종격동 림프절 절제술과 함께 근치적 폐 절제술을 시행받았던 293명의 환자를 대상으로 의무기록을 토대로 후향적 연구를 시행하였다. 환자의 평균나이는 $63.0{\pm}8.3$세($37{\sim}88$세)였으며 남자가 220명(75.1%)이었다. 원발성 종양과 림프절의 분류는 Mountain등이 발표한 TNM 병기를 근거로 하였으며 조직학적 분류는 WHO 분류를 기초로 하였다. 통계 처리는 Fisher's exact test와 chi-square test를 사용하였고 p 값이 0.05 미만일 경우 의의 있는 결과로 받아들였다. 결과: 전체 환자 중에서 폐엽절제술은 180명, 폐이엽절제술은 50명, 소매폐엽절제슬은 10명, 전폐절제술은 53명에서 시행되었다. 수술 후 폐종양의 병리학적 진단은 선암(adenocarcinoma)이 124명, 편평세포암(squamous cell carcinema)이 138명, 선편평세포암(adenos-quamous cell carcinoma)이 14명이었으며 카르시노이드종양(carcinoid tumor) 1명, 대세포암(large cell carcinoma) 8명, 암육종(carcinosarcoma) 1명, 점액표피양암(mucoepiderrnoid carcinoma) 2명, 미분류된 암이 5명이었다. 술 후 TNM 병기는 IA가 51명, IB가 98명, IIA가 9명, IIB가 41명, IIIA가 71명, IIIB가 16명, IV가 6명이었다. 전체 환자 중 N2 이상의 병기를 보인 환자는 25.9%(76명)이었고 그 중 우상엽의 병변인 경우 4번 림프절로의 전이가 가장 많았으며 좌상엽의 병변인 경우 4번과 5번, 나머지 폐엽에서는 7번 림프절로의 전이가 가장 많았으나 통계적 의의는 없었고 도약 전이가 전체 환자 중12.3% (36명)에서 발견되었다. 결론: 원발성 비소세포성 폐암의 폐엽에 따른 종격동 림프절 전이 양상은 뚜렷한 규칙이 없으며 도약 전이도 12.3%에서 발생되었으므로 완전한 종격동 림프절 절제술만이 정확한 병기를 결정하는데 도움이 되고 환자의 예후를 결정하는데 중요한 역할을 한다고 생각한다.

Keywords

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