Progress in the Treatment and Outcomes for Early-Stage Non-Small Cell Lung Cancer

Fifty-seven thousand and eighty-eight NSCLC patients with early-stage disease from 1988 to 2014 were identified. 6409 (11.2%) were diagnosed in 1988–1994, 5800 (10.2%) 1995–1999, 13,031 (22.8%) 2000–2004, 15,786 (27.7%) 2005–2009, and 16,062 (28.1%) 2010–2014. We observed a significant increase in the proportion of older patients, adenocarcinoma histology, and rate of wedge resection over the study period. The five-year overall survival (OS) for the entire cohort was 63.3%. Those undergoing resection without adjuvant therapy had the highest outcomes. Lobectomy was associated with better outcomes compared to wedge resection or pneumonectomy. A significant difference in five-year OS by year of diagnosis (1988–1994: 58.8% vs. 1995–1999: 60.6% vs. 2000–2004: 63.2% vs. 2005–2009: 66.1%; p < 0.001) was observed. This significant OS difference was also observed regardless of age, surgery type, and T stage, but also only in those with adenocarcinoma. On multivariable analysis, year of diagnosis, age, gender, race, treatment and surgery type, histology, T stage, and tumor grade remained independent prognostic factors for OS.