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Kaplan-Meier overall survival estimates according to CTC in patients with AJCC/UICC TNM stage of 1–2/3–4 CCA
A: CTC ≥2 vs. CTC <2, TNM stage of 3–4 CCA
B: CTC ≥5 vs. CTC <5, TNM stage of 3–4 CCA
C: CTC ≥2 vs. CTC <2, TNM stage of 1–2 CCA
D: CTC ≥5 vs. CTC <5, TNM stage of 1–2 CCA
