KPNB1 and cancer: We previously showed that inhibition of Kpnβ1 protein expression leads to cancer cell death via apoptosis [10], and Kuusisto and Jans (2015) showed that faster growing tumour cells expressing high levels of Kpnβ1 are more dependent on, or “addicted to”, Kpnβ1 than their non-transformed counterparts [13].