PMID: 26328253Sep 4, 2015Paper

Disparate survival trends in histologic subtypes of metastatic non-small cell lung cancer: a population-based analysis

American Journal of Cancer Research
Adam J OlszewskiSabrina M Witherby

Abstract

Erlotinib, bevacizumab, and pemetrexed improved survival of metastatic non-small cell lung cancer (mNSCLC) in clinical trials, but their benefits are restricted to non-squamous histology. We studied recent survival trends in mNSCLC subpopulations defined by histology and associated clinical factors correlating with adenocarcinoma or endothelial growth factor receptor mutations. Using the Surveillance, Epidemiology and End Results database, we calculated relative survival at 1 year from diagnosis for mNSCLC cases diagnosed in 2000-2011. Trends by histology, age, sex, race, prevalence of smoking or poverty, expressed as annual percent change (APC) using joinpoint regression, were compared by test of slope parallelism (Ppar ). Among 226,446 cases, 47% had adenocarcinoma, 20% squamous carcinoma, 6% other, and 27% unspecified histology. The proportion of cases designated as adenocarcinoma significantly increased after 2005. One-year survival increased from 23.5% in 2000 to 30.5% in 2010, significantly more for adenocarcinoma (APC, 3.3%) than squamous carcinoma (APC, 2.1%, Ppar =0.0018). For patients with adenocarcinoma, these trends were significantly better for Asians than Whites (Ppar =0.012) and for areas with fewer smokers (Ppar...Continue Reading

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