Spontaneous in vitro maturation of oocytes prior to ovarian tissue cryopreservation in natural cycles of oncologic patients |
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Authors: | María-José Escribá Noelia Grau Laura Escrich Edurne Novella-Maestre María Sánchez-Serrano |
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Institution: | 1.Universitary Institute IVI Valencia, Valencia, Spain ;2.Department of Genetics, Hospital Universitario y Politécnico La Fe de Valencia, Valencia, Spain ;3.Department of Obstetrics and Gynaecology, Complejo Hospitalario Universitario de Albacete, Albacete, Spain ;4.Universitary Institute IVI Valencia, Plaza Policía Local, 3, Valencia, 46015 Spain |
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Abstract: | PurposeTo evaluate the recovery rate and spontaneous in vitro maturation (IVM) of immature oocytes enclosed within or released from follicles during the processing of ovarian tissue prior to its cryopreservation.MethodsThirty-three oncologic patients who had not previously undergone chemo or radiotherapy underwent ovarian tissue cryopreservation (OTC) during natural menstrual cycles. Immature oocytes, enclosed within follicles or released during ovarian cortex processing, were collected and matured spontaneously in vitro for 48 h. Nuclear maturation was assessed every 24 h and the ability of the IVM oocytes to display a normal activation response following parthenogenetic activation was evaluated. The following outcome measures were also evaluated: disease, age, FSH, LH, E2, P4 and AMH serum levels, menstrual cycle day, recovery and spontaneous IVM and parthenogenetic activation rates.ResultsOocytes recovered per patient were 3.3?±?0.7 (1.8–4.7 oocytes, 95CI), regardless of the menstrual phase. The mean number of IVM oocytes per patient was 1.3?±?0.2 oocytes (95CI: 0.8–1.8), regardless of menstrual phase (p?=?0.86) and oocyte origin (p?=?0.61). Forty-one percent of oocytes extruded the second polar body and formed one pronucleus after parthenogenetic activation.ConclusionTwenty-one of the 33 women (63.6 %) requesting OTC produced at least one mature oocyte. |
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Keywords: | Ovarian tissue cryopreservation Immature oocyte Spontaneous in vitro maturation Human Oncologic patient Natural cycles |
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