Transplantation of frozen-thawed ovarian tissue: an update on worldwide activity published in peer-reviewed papers and on the Danish cohort
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The purpose of the study is to review all peer-reviewed published reports of women receiving ovarian tissue transplantation (OTT) with frozen/thawed tissue (OTC) with respect to age, diagnosis, transplantation site, fertility outcome, and potential side effects, including data from all women in the Danish program.
A systematic review of the literature was performed in PubMed combined with results from all patients who had received OTT in Denmark up to December 2017.
OTT has been reported from 21 different countries comprising a total of 360 OTT procedures in 318 women. In nine women, malignancy was diagnosed after OTT; none were considered to be directly caused by the OTT. Despite a potential under reporting of cancer recurrence, there is currently no evidence to suggest that OTT causes reseeding of the original cancer. Renewed ovarian endocrine function was reported in 95% of the women. Half of all children born following OTT resulted from natural conception, and newborns were reported to be healthy except for one neonate with a chromosome anomaly with a family disposition. Women who conceived after OTT were significantly younger than those who failed.
This study found no indications of sufficient numbers of malignant cells present in the ovarian tissue to cause recurrence of cancer after OTT. Further, it is unlikely that OTC affects the well-being of children born. OTC is now an established method of fertility preservation in Denmark with public reimbursement. The current data encourage that women who require gonadotoxic treatment should be offered an individual evaluation considering fertility preservation.
KeywordsOvarian transplantation Ovarian tissue cryopreservation Outcome Safety Relapse
All personnel including the clinical activities in fertility preservation are thanked for their passionate work.
The University Hospital of Copenhagen, the EU interregional project ReproUnion, and Vera and Carl Johan Michaelsens Legat are gratefully acknowledged for financial support.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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