We showed that in Rab27‐knockdown 4T1 cell‐implanted mice treated with 6J1, tumor growth and burden were both significantly lower when compared with either control 4T1 cell‐implanted mice treated with or without 6J1, or Rab27‐knockdown 4T1 cell‐implanted mice without 6J1 treatment (Figure 6B–D). Here, RAB27A is linked to neoplasm.