BIRC3 and cancer: MiR‐219a‐5p has been reported as a tumor suppressing miRNA for many cancers.17, 19, 20 We found miR‐219a‐5p expression is downregulated in TNBC cells, and overexpression of miR‐219a‐5p could inhibit both HCP5 and BIRC3 mRNA level.