CD44 and cancer: Furthermore, we used immunostaining assay to detect the correlation between the expression of TRIP6 and CD44 in breast cancer patient specimens, and found that in the breast cancer samples, the areas that displayed high levels of TRIP6 staining also showed strong CD44 staining, while areas with low TRIP6 expression also displayed weakly detectable CD44 expression (Fig. 3e), indicating that the expression of TRIP6 was significantly correlated with the expression of cancer stem cell marker-CD44.