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Overall survival (OS) by histology: nonsquamous compared with squamous compared with not otherwise specified (NOS) when treated with (A) best supportive care (BSC) (median OS: 3.8 months nonsquamous vs. 3.5 months squamous vs. 3.0 months NOS, p < 0.001) or (B) systemic therapy (median OS: 11.9 months nonsquamous vs. 8.4 months squamous vs. 11.3 months NOS, p < 0.116).
