Skip to main content
. 2019 Oct 12;157(5):1322–1345. doi: 10.1016/j.chest.2019.09.025

Figure 1.

Figure 1

Study cohort selection results. SEER and Texas Cancer Registry 2004 to 2013. aNote that the SEER registry does not have complete staging information on all patients. There were 4,982 patients who met all the other inclusion criteria (NSCLC, year of diagnosis, first primary cancer with no second primary, Medicare Parts A and B at least 6 months, not in HMO within 6 months, and received treatment) who were not included because in the SEER database their stage was classified as stage unknown. These 4,982 patients were excluded. HMO = health maintenance organization; NSCLC = non-small cell lung cancer; SEER = Surveillance, Epidemiology, and End Results.