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Volume 31 -Issue 12 -2020 BMT, bone marrow transplantation; CED, cyclophosphamide equivalent dose; ChT, chemotherapy; FSH, follicle-stimulating hormone; RT, radiotherapy. a Adapted from Lee et al. 10 Table contains examples and is not a complete list.M. Lambertini et al.

The clinical and research questions identified and the ethical and legal issues raised are highly relevant to the multi-disciplinary teams developing treatment strategies to preserve the fertility of prepubertal and adolescent boys who have a high risk of fertility loss due to ablative interventions, trauma or genetic pre-disposition.

The present study demonstrates that spermatogonia are able to survive and proliferate after cryopreservation and long-term transplantation. Complete regeneration of normal spermatogenesis was not observed since, beyond the pachytene stage, no adequate characterization of germ cells was obtained. Further studies are thus required to investigate the differentiation potential of cryopreserved germ cells.