Therefore, we detected the serum levels of miR‐27a‐3p and ATF3 mRNA by RT‐qPCR, which exhibited that the serum levels of miR‐27a‐3p in BA children were visibly higher (p < 0.001) (Figure 1A), whereas the serum ATF3 mRNA levels were notably lower in BA children than healthy children (p < 0.001) (Figure 1B). Here, ATF3 is linked to breast angiosarcoma.