For BC0145 xenograft, the identification of cancer stem/progenitors based on IGF-1R expression (one out of 54,785; Figure 1D) was slightly better than ALDH+ (one out of 93,412; see Table S1 in Additional file 1) but not as good as CD24-CD44+ (one out of 6,401; see Table S1 in Additional file 1). Here, CD44 is linked to cancer.