First successful fertility restoration from frozen prepubertal testicular tissue
In a proof-of-principle trial, researchers transplanted cryopreserved prepubertal testicular tissue back into a man who had high-dose chemotherapy as a child; two grafts formed mature sperm, which were collected and frozen, marking the first time this approach restored sperm production in an adult and offering hope for biological children in childhood cancer survivors. The findings appear in a preprint and have not yet been peer‑reviewed, and UK trials are expanding the work with hundreds of patients potentially benefiting.
