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Kaplan–Meier survival plots showing OS for patients less than 60 y old (A), 60–70 y old (B), and more than 70 y old (C). OS differed significantly between PET/CT scans positive for lung tumor and PET/CT scans negative for lung tumor in patients < 60 y old and those 60–70 y old. No significant difference was observed in patients > 70 y old.
