Research Article

Optimal Strategy for Colorectal Cancer Patients’ Diagnosis Based on Circulating Tumor Cells and Circulating Tumor Endothelial Cells by Subtraction Enrichment and Immunostaining-Fluorescence In Situ Hybridization Combining with CEA and CA19-9

Figure 4

Heatmap showing the correlation between CTC, CTEC, CEA, CA19-9, and CRC development. The value in the grids of the upper triangle is the Pearson correlation coefficient (Pearson r), which is marked by colors. The value in grids of the lower triangle is value of Pearson correlation. , , and .