Ovarian tissue cryopreservation and transplantation: what advances are necessary for this fertility preservation modality to no longer be considered experimental?

Ovarian tissue cryopreservation and transplantation: what advances are necessary for this fertility preservation modality to no longer be considered experimental?
Nearly 20 years ago, Oktay and his colleagues reported on a groundbreaking event in reproductive technology: the first successful human transplantation of thawed cryopreserved ovarian tissue. The case involved a 29-year-old woman who had undergone prior oophorectomy for bilateral dermoid cysts with ovarian tissue cryopreservation (OTC). Utilizing a laparoscopic approach with ovarian tissue segments sutured on a cellulose membrane, the ovarian tissue was grafted beneath the left pelvic peritoneum.
Source: fertstert.org