• Shinkichi Takamori, Atsushi Osoegawa, Asato Hashinokuchi, Takashi Karashima, Yohei Takumi, Miyuki Abe, Masafumi Yamaguchi, Tomoyoshi Takenaka, Tomoharu Yoshizumi, Junjia Zhu, and Takefumi Komiya.
• Department of Thoracic and Breast Surgery, Oita University Faculty of Medicine, Oita.
• Chest. 2024 Jul 14.

BackgroundThe eighth edition of lung cancer N staging assignment includes the location of lymph node metastasis, but does not include single-N and multiple-N descriptors.Research QuestionDo the single-N and multiple-N statuses stratify the prognosis of patients with non-small cell lung cancer (NSCLC)?Study Design And MethodsUsing the National Cancer Database, we analyzed patients with pathologically staged N1 and N2 NSCLC. N descriptors were classified into pathological single N1 (pSingle-N1), pathological multiple N1 (pMulti-N1), pathological single N2 (pSingle-N2), and pathological multiple N2 (pMulti-N2). Survival analysis was performed using the Kaplan-Meier method and multivariable Cox regression models.ResultsIn the general analysis cohort, 24,531, 22,256, 8,528, and 21,949 patients with NSCLC demonstrated pSingle-N1, pMulti-N1, pSingle-N2, and pMulti-N2 disease, respectively. Patients with pMulti-N1 and pMulti-N2 disease showed a shorter survival than those with pSingle-N1 and pSingle-N2 disease, respectively (hazard ratio [HR], 1.22 [P < .0001] for N1 and 1.39 [P < .0001] for N2). After adjusting age, sex, and histologic findings, the HR for pSingle-N2 compared with pMulti-N1 disease was 1.05 (P = .0031). Patients with pN1 disease were categorized by metastatic lymph node count (1, 2, 3, ≥ 4), showing significant prognostic differences among groups (P < .0001). In the sensitivity analysis cohort (limited to R0 resection, lobectomy, or more; survival ≥ 30 days; ≥ 10 examined lymph nodes; and without neoadjuvant therapy; n = 34,904) and the external validation cohort (n = 708), analyses supported these results.InterpretationPatients with NSCLC with one metastatic lymph node, whether in N1 or N2 stations, showed better survival than those with more than one lymph node involved. Patients with NSCLC with a single-skip N2 lymph node metastasis showed survival similar to patients with multiple N1 lymph nodes, and the number of lymph nodes involved in N1 resections up to four or more was sequentially prognostic.Copyright © 2024 American College of Chest Physicians. Published by Elsevier Inc. All rights reserved.

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