Timing of fertility preservation procedures in a cohort of female patients with cancer.

Comparison of time intervals from diagnosis to chemotherapy between patients opting for embryo cryopreservation or ovarian tissue cryopreservation.Retrospective analysis.University hospital in the Netherlands.Thirty-five female patients undergoing fertility preservation procedures before treatment with chemotherapy for cancer. Embryo cryopreservation was performed in 12 patients and ovarian tissue cryopreservation in 23 patients. We investigated differences in time intervals (from diagnosis to start of chemotherapy) between patients opting for embryo cryopreservation and patients opting for ovarian tissue cryopreservation. We calculated time intervals between the moment of diagnosis, the moment of referral, the moment of consultation, the moment of finishing of the fertility preservation procedure and the start of chemotherapy.The median time between diagnosis and referral (median=18 days) and between referral and consultation (median=5 days) was comparable in both groups. A significant difference was found between ovarian tissue cryopreservation and embryo cryopreservation for the time interval between consultation and cryopreservation (p=0.001). Ovarian tissue cryopreservation was completed for half of the patients within 6 days after consultation with the gynecologist, and the hormonal stimulation for embryo cryopreservation was completed for all patients within four weeks (median=18 days), with a median of 11 days of hormonal stimulation. A significant difference was found between ovarian tissue cryopreservation and embryo cryopreservation in the time interval between fertility preservation and start of chemotherapy (median=7 vs 19 days, p=0.019). In sum, the total duration between diagnosis and chemotherapy was significantly shorter for ovarian tissue cryopreservation patients than for embryo cryopreservation patients (median=47 vs 69 days, p=0.042).Embryo cryopreservation can be performed within the standard timeframe of cancer care in patients with breast cancer receiving adjuvant chemotherapy, but if delay of the start of chemotherapy is harmful, ovarian tissue cryopreservation can be done within one week.