Differences in OS for lung primaries were not as marked but still quite significant (HR = 1.24 [95% CI: 1.22–1.25]) and were maintained on analysis of both SCLC (HR = 1.15 [95% CI: 1.11–1.19]) and NSCLC (HR = 1.26 [95% CI: 1.24–1.28]) histologies.
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