I-SPY2 Endocrine Optimization Pilot (EOP): Neoadjuvant amcenestrant +/- abemaciclib +/- letrozole in molecularly selected patients (pts) with HR+ HER2- stage 2/3 breast cancer (BC).

Amy Jo Chien, Rita A. Mukhtar, Karthik Giridhar, Olufunmilayo I. Olopade, Kevin Kalinsky, Christos Vaklavas, Anthony D. Elias, Mei Wei, Matthew P. Goetz, Laura van 't Veer, Silver Alkhafaji, Hope S. Rugo, Nan Chen, W. Fraser Fraser Symmans, Alexander D. Borowsky, Lamorna Brown Swigart, Natsuko Onishi, Douglas Yee, Nola Hylton, Laura Esserman