Efficacy of contrast versus non-contrast CT surveillance among patients surviving two years without recurrence after surgery for stage I lung cancer.

Although patients undergoing NCECT surveillance had 0.04 more deaths per 100 person-year compared with patients undergoing CECT surveillance (95% CI −0.36 to 0.44), this difference did not reach statistical significance (1.27 vs. 1.31 per 100 person-years; HR, 1.10; 95% CI 0.81–1.50).

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