We found the amount of MEIS2 knock‐down breast cancer cells is much more than the control group after 5 days, indicating that knockdown of MEIS2 significantly increased the proliferation rates of both MDA‐MB‐231 and T47D MEIS2‐KD cells as compared with their control cells (Figure 3B,E). Here, MEIS2 is linked to breast carcinoma.