Abstract
Purpose
Hydroxypropyl cellulose (HPC), a polysaccharide that forms a viscous gel under low temperatures, is a promising substitute of the blood-derived macromolecules traditionally used in cryopreservation solutions. The performance of a protein-free, fully synthetic set of vitrification and warming solutions was assessed in a matched pair analysis with donor oocytes.
Methods
A prospective study including 219 donor MII oocytes was carried out, comparing the laboratory outcomes of oocytes vitrified with HPC-based solutions and their fresh counterparts. The primary performance endpoint was the fertilization rate. Secondary parameters assessed were embryo quality on days 2 and 3.
Results
70/73 (95.9%) vitrified MII oocytes exhibited morphologic survival 2 h post-warming, with 49 (70.0%) presented normal fertilization, compared to 105 of 146 (71.9%) MII fresh oocytes. Similar embryo quality was observed in both groups. A total of 18 embryos implanted, out of 38 embryos transferred (47.3%), resulting in 13 newborns.
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Acknowledgments
We would like to give special thanks to all the staff of the clinic that participated in the study. We would also like to express our gratitude for the excellent peer-review process the manuscript was subjected to.
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The study was conducted as described in the protocol, which was developed in accordance to the principles of Helsinki and the national Policy of Good Clinical Practice (ISO 14155:2011), and was approved by the internal review board of the institutional research committee. All recipients were informed thoroughly about the protocol of the study and signed an informed consent form.
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Capsule The satisfactory results of this direct comparison with fresh controls strongly support the effectiveness of HPC supplementation of vitrification solutions, confirming its role as a substitute for protein supplementation.
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Gallardo, M., Hebles, M., Migueles, B. et al. Hydroxypropyl cellulose supplementation in vitrification solutions: a prospective study with donor oocytes. J Assist Reprod Genet 34, 417–422 (2017). https://doi.org/10.1007/s10815-016-0841-y
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DOI: https://doi.org/10.1007/s10815-016-0841-y