Figure 1From: Circulating tumor cells as prognostic and predictive markers in metastatic breast cancer patients receiving first-line systemic treatmentPrognostic value of circulating tumor cells in the overall population. Estimated (a) progression-free survival and (b) overall survival according to baseline circulating tumor cell (CTC) value (< 5 vs. ≥ 5) in the overall population. C.I., confidence interval.Back to article page