PhD Conferral Mrs. Irene E.G. van Hellemond, MSc. 31 October 2019 14:00 Supervisor: prof.dr. V.C.G. Tjan-Heijnen Co-supervisor: Dr. P.G.M. Peer, Radboud UMC Nijmegen “Tailoring endocrine therapy in early breast cancer. Prolonged duration and potential drawbacks”