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Kaplan–Meier survival curve for lung cancer patients with and without PPSV23 vaccination. The 2-year overall survival rates of lung cancer patients with and without PPSV23 vaccination were 46.6% and 26.2%, respectively (P < 0.001). Continuous line indicates lung cancer patients with PPSV23 vaccination, Dash line indicates lung cancer patients without PPSV23 vaccination.
