世界首例！冷冻保存16年的睾丸组织，移植回体内后，重新产生了精子

TL;DR - The first reported human autotransplantation of immature testicular tissue restored sperm production after 16 years of cryostorage, offering proof of concept for preserving fertility in prepubertal patients facing gonadotoxic treatment.

• Tissue grafted inside the testis re-established blood supply and completed spermatogenesis; researchers recovered one sperm.
• Subcutaneous scrotal grafts produced no germ cells, suggesting the testicular microenvironment is critical.
• The tissue had been collected before puberty, when mature sperm were unavailable for conventional freezing.
• Reported at a scientific conference and in a medRxiv preprint, the result requires validation in more patients.