Another report showed that RNA‐binding protein tristetraprolin (TTP) inhibited cell proliferation in vitro and suppressed tumour growth in vivo through inhibiting c‐Jun expression and therefore increased Wee1 expression, a protein kinase and a key mammalian cell cycle regulator, and blocking NF‐κB/p65 nuclear translocation in breast cancer cells 64. This evidence concerns the gene JUN and breast cancer.