For pre-menopausal female patients who present with acute leukemia in need of urgent anti-neoplastic therapy, what is your preferred approach in effort to preserve fertility?

This patient would be a good candidate for ovarian tissue cryopreservation (OTC), since time would be limited to stimulate and retrieve oocytes. One can complete OTC with line placement and other procedures and be able to start chemotherapy the day after OTC. I know not every center has access to OT...