Nationwide Survey on the Status of Oncofertility in Japan and Involvement of Embryologists in the Practice of Fertility Preservation.

To investigate the actual status of fertility preservation techniques in oncofertility in Japan and to clarify the involvement of embryologists in this field. This survey was conducted online, targeting embryologists working at 622 facilities registered with the Japan Society of Obstetrics and Gynecology for assisted reproductive technology. The response rate was 56.6%. In total, 56.8% of facilities used some form of cryopreservation as fertility preservation therapy for patients with cancer; patients' age range was widely defined at each facility. The most common renewal frequency of cryopreserved specimens for patients with cancer was at 1-year intervals. The most common renewal methods were during patient visits to the hospital and contact by letter. Knowledge levels regarding fertility preservation therapy were not high among many embryologists, but respondents recognized the important role of embryologists in oncofertility. This study is the first to clarify the importance of embryologists in oncofertility. Many embryologists felt that their knowledge of fertility preservation was limited and considered it necessary to improve their education, including public certification. Guidelines for long-term storage systems, including methods for renewal of cryopreservation, need to be established.