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Background: The therapeutic strategies for clinical stage T1–3N2 (cT1–3N2) lung cancer are controversial. For operable tumors, treatment can vary by center, region, and continent. This study aimed to identify the optimal therapeutic method and type of surgical strategy for cT1–3N2 lung cancer. Methods: This retrospective evaluation analyzed the records of 17,954 patients with cT1–3N2 lung cancer treated in 2010 through 2015 from the SEER database. The effects of different therapeutic methods and types of surgical strategies on overall survival (OS) were assessed. Univariate and multivariate analyses were performed using a Cox proportional hazards model. Results: The 5-year OS rates were 27.7% for patients with T1N2 disease, 21.8% for those with T2N2 disease, and 19.9% for T3N2 disease. Neoadjuvant therapy plus operation (OP) plus adjuvant therapy, and OP plus adjuvant therapy, provided better 5-year OS rates than OP alone or concurrent chemoradiotherapy (34.1%, 37.7%, 29.3%, and 16.1%, respectively). In the T1N2, T2N2, and T3N2 groups, lobectomy provided better 5-year OS than pneumonectomy, sublobectomy, and no surgery. Both univariate and multivariate analyses showed that young age, female sex, well-differentiated histologic grade, adenocarcinoma cell type, neoadjuvant and adjuvant therapy, lobectomy, and T1 stage were statistically associated with better 5-year OS rates. Conclusions: In cT1–3N2 lung cancer, multimodal treatments tended to provide better 5-year OS than OP alone or concurrent chemoradiotherapy. In addition, lobectomy was associated with better survival than other operative methods.

The prognostic value for the post-chemoradiation therapy (CRT) pathologic stage is uncertain. The purpose of this study was to compare the pathologic stage in patients undergoing esophagectomy with and without preoperative CRT for esophageal squamous cell carcinoma (ESCC). This study retrospectively reviewed the data from 2151 patients with ESCC who underwent esophagectomy with or without preoperative CRT between 2008 and 2011 in Taiwan. Patients were divided into 2 groups. Group A consisted of patients treated with primary surgery without prior treatments (n=1301), and group B consisted of patients receiving preoperative CRT followed by esophagectomy (n=850). In group A, 679 patients received surgery alone, 92 received postoperative chemotherapy, 416 received postoperative chemoradiation therapy, and 114 received postoperative radiation therapy. In group A, the 3-year survival rates by pathologic stage were 82.2% for stage 0, 67.6% for stage I, 50.7% for stage II, 21.5% for stage III, and 14.8% for stage IV (P<.001). In group B, the 3-year survival rates of post-CRT pathologic stages 0, I, II, III, and IV were 59.4%, 46.0%, 40.3%, 19.1%, and 8.2%, respectively (P<.001). In multivariate analysis, the pathologic T, N, and M were all independent prognostic factors in both group A (esophagectomy alone) and B (CRT plus esophagectomy). The current, 7th edition of the esophageal TNM staging system could adequately stratify prognostic groups in patients with squamous cell carcinoma who were treated with preoperative CRT and esophagectomy.