<prompt> All of the following drugs are used in the treatment of metastatic breast cancer except:IxabepiloneAbemaciclibRibociclibSunitinib  <response>: Ixabepilone is a semisynthetic epothilone B analog that functions as a microtubule inhibitor. it is approved for metastatic breast cancer in combination with the oral fluoropyrimidine capecitabine or as monotherapy. Abemaciclib Ribociclib are cyclin dependent kinase inhibitors CDKI and are given orally in breast cancer. Sunitinibis a Tyrosine kinase inhibitor and is used mainly in GIST and RCC. 