The impact of letrozole administration on oocyte morphology in breast cancer patients undergoing fertility preservation.

Abstract: Patients submitted to oncological fertility preservation with letrozole and gonadotropins seem to present a higher rate of immature oocytes and lower fertilization rates in comparison to infertile patients submitted to IVF cycles with gonadotropins. The aim of this study was to evaluate the influence of letrozole on oocyte morphology in patients with breast cancer submitted to fertility preservation.

Methods: Retrospective analysis performed at a public tertiary hospital in São Paulo, Brazil.