AUTHOR=Zhang Rusi , Cai Ling , Wang Gongming , Wen Yingsheng , Wang Fang , Zhou Ningning , Zhang Xuewen , Huang Zirui , Yu Xiangyang , Xi Kexing , Yang Longjun , Zhao Dechang , Lin Yongbin , Zhang Lanjun 

TITLE=Resection of Early-Stage Second Primary Non-small Cell Lung Cancer After Small Cell Lung Cancer: A Population-Based Study

JOURNAL=Frontiers in Oncology

VOLUME=9

YEAR=2020

URL=https://www.frontiersin.org/journals/oncology/articles/10.3389/fonc.2019.01552

DOI=10.3389/fonc.2019.01552

ISSN=2234-943X

ABSTRACT=<p><bold>Introduction:</bold> A certain number of small cell lung cancer (SCLC) patients become long-term survivors after treatment, and they are at high risk to develop a second primary malignancy, including non-small cell lung cancer. However, the optimal management of early-stage second primary non-small cell lung cancer (SPLC) after SCLC remains unknown. This study aims to evaluate the survival benefits of surgery in these patients.</p><p><bold>Methods:</bold> Patients with early-stage SPLC after SCLC were identified from the Surveillance, Epidemiology, and End Results database. Patients were balanced with propensity score matching (PSM). Overall survival (OS) and lung cancer-specific survival (CSS) were compared between non-surgery group and surgery group with the Kaplan–Meier method and Cox multivariate regressions.</p><p><bold>Results:</bold> A total of 228 patients with early-stage SPLC after SCLC were identified. Surgery was associated with significantly improved OS and CSS in the multivariate Cox regression analysis (OS, 5-year survival: 41.2 vs. 11.6%, HR: 0.42, 95% CI: 0.31–0.59, <italic>P</italic> &lt; 0.01; CSS, 5-year survival: 46.8 vs. 24.3%, HR: 0.53, 95% CI: 0.37–0.75, <italic>P</italic> &lt; 0.01). However, no statistically significant survival difference was found between sublobar resection and lobectomy (OS, 5-year survival: 41.0 vs. 45.3%, <italic>P</italic> = 0.73; CSS, 5-year survival: 43.5 vs. 54.1%, <italic>P</italic> = 0.49). After 1:1 PSM, 162 patients were selected for further analysis, and surgery continued to demonstrate superior survival (OS, 5-year survival: 44.2 vs. 7.2%, HR: 0.48, 95% CI: 0.33–0.70, <italic>P</italic> &lt; 0.01; CSS, 5-year survival: 48.0 vs. 20.6%, HR: 0.44, 95% CI: 0.42–0.97, <italic>P</italic> = 0.03).</p><p><bold>Conclusion:</bold> The resection of early-stage SPLC after SCLC led to significantly improved OS and CSS and therefore should be considered whenever possible. Nevertheless, further randomized controlled trials are warranted to investigate the safety and effect of surgery in these patients.</p>