91OCirculating tumor DNA and disease recurrence in early stage breast cancer: From a case-control study to a prospective longitudinal trial. (13th May 2019) - Di Cosimo, S; Appierto, V; Ortolan, E; Dell'Angelo, F; Silvestri, M; Bianchi, G; Folli, S; De Cecco, L; Pruneri, G; Daidone, M G