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Kaplan-Meier plot of progression-free survival in OS patients using a cut-off of 2 CTCs per 7.5 ml peripheral blood. The ≥2 CTCs group had a median progression-free survival of 440 days, whereas the <2 CTCs group had a median progression-free survival of 547 days [P=0.0416, hazards ratio (log-rank) = 4.091, 95% CI of hazards ratio, 1.075–9.684].
