 - Currently receiving rivaroxaban, apixaban, endoxaban, warfarin or other warfarin derived anticoagulant; therapy with heparin, low molecular weight heparin LMWH, dabigatran or fondaparinux is allowed; if transitioning from a prohibited anticoagulant, a minimum washout of 7 days from last dose of the prohibited medication is required prior to ribociclib start 