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© Journal of Thoracic Disease. All rights reserved. J Thorac Dis 2017; 9 (11): 4286-4290 jtd. amegroups. com significantly better when N1 involvement was intralobar (levels 12 and 13, n= 102), as compared with extralobar (hilar) involvement (levels 10 and 11, n= 154): 53.6% vs. 38.5%(P= 0.02). Ten years later, Demir and coworkers reviewed 540 pN1 patients (7). The 5-year survival rates for patients with hilar N1 (station 10), interlobar (station 11), and peripheral N1 (stations 12 to 14) involvement were 39%, 51% and 53%, respectively. Patients with hilar LN metastasis showed a shorter survival period than patients with peripheral LN involvement (P= 0.02). Patients with hilar zone N1 (stations 10 and 11) involvement tended to show poorer survival than patients with peripheral zone N1 (12 to 14) metastasis (P= 0.08). The same kinds of results have subsequently been commonly reported. Maeshima and …