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Objective. In order to elucidate whether interlobar pleural invasion of lung cancer should be categorized T2 or T3, we examined the results of the operations for lung cancers with interlobar pleural invasion (interlobar p3). Methods. Among 402 patients who were operated on for primary lung cancer in our hospital between 1984 and 1999, we studied 17 non-small cell lung cancer patients with interlobar p3, excluding patients who were diagnosed as t3 or t4 disease, or those with distant metastasis. The results of those 17 patients were compared with those of 32 patients with t3 non-small cell lung cancer and those of 152 patients with t2 non-small cell lung cancer. Results. The 5-year survival rate for patients with interlobar p3 was 38.5%. The 5-year survival rate for patients with t3 disease was 16.2%, and that for patients with t2 disease was 44.5%. The survival rate for patients with t2 disease was significantly higher, compared with that for patients with t3 disease. However there were no significant differences among the survival rate for patients with interlobar p3 and that for patients with t2 or t3 disease. Regarding the survival rate curve, that of patients with interlobar p3 is close to that of patients with t3 up to 18 months, but it is close to that of t2 cases for over 6-year survival. In patients without lymph node metastasis, similar results were obtained. Regarding the difference of survival rates in each operation procedure for patients with interlobar p3, the 5-year survival rate by bilobectomy or pneumonectomy was 37.5%, while by lobectomy plus partial resection of the invaded lobe there was no 5-year survivor, and the 4year survival rate was 40%. There was no significant difference between the survival rate by bilobectomy or pneumonectomy and that by lobectomy plus partial resection. Conclusion. The survival rate of patients with interlobar p3 is close to that of patients with t3, one or two years after operation; and close to that of patients with t2, in case of long term survivors. (JJLC. 2002; 42: 583-587) 1 埼 玉 医 科 大学 呼 吸 器 外科 . 別 刷 請求 先:森 田理一 郎,埼 玉 医科 大 学呼 吸 器外 科,〒350-0495 埼 玉 県 入 間 郡 毛 呂 山 町 毛 呂 本 郷38 (e-mail: morita57@saitamamed.acjp). 1 Department of General Thoracic Surgery, Saitama Medical School, Japan. Reprints: Riichiro Morita, Department of General Thoracic Surgery, Saitama Medical School, 38 Morohongo, Moroyama-cho, Iruma-gun, Saitama 350-0495, Japan (e-mail: morita57@saitamamed.ac.jp). Received April 3, 2002; accepted August 9, 2002. (C) 2002 The Japan Lung Cancer Society Japanese Journal of Lung Cancer-Vol 42, No 6, Oct 20, 2002-www.haigan.gr.jp 583 Interlobar Pleural Invasion in Lung Cancer-Morita et al KEY WORDS-Lung cancer, Interlobar pleural invasion

Should Interlobar Pleural Invasion Be Categorized as T2 or T3?