Figure 5

The expression level of CK19 in peripheral blood of breast cancer patients is correlated with the disease stage. CK19 from each peripheral blood sample was detected by flow cytometry as described in methods. All the negative results were shown as number undetected. All 4 patients at stage I were CK19 negative. The median is marked as "---" in each group. Where the frequency of negative cases is > 50%, the median cannot be shown. p < 0.05 was considered significant.