Entity

Time filter

Source Type

Barcelona, Spain

Vassena R.,Clinica EUGIN | Eguizabal C.,Basque Center for Transfusion and Human Tissues | Heindryckx B.,Ghent University | Sermon K.,Free University of Brussels | And 7 more authors.
Human Reproduction | Year: 2015

STUDY QUESTION Are there effective and clinically validated stem cell-based therapies for reproductive diseases? SUMMARY ANSWER At the moment, clinically validated stem cell treatments for reproductive diseases and alterations are not available. WHAT IS KNOWN ALREADY Research in stem cells and regenerative medicine is growing in scope, and its translation to the clinic is heralded by the recent initiation of controlled clinical trials with pluripotent derived cells. Unfortunately, stem cell 'treatments' are currently offered to patients outside of the controlled framework of scientifically sound research and regulated clinical trials. Both physicians and patients in reproductive medicine are often unsure about stem cells therapeutic options. STUDY DESIGN, SIZE, DURATION An international working group was assembled to review critically the available scientific literature in both the human species and animal models. PARTICIPANTS/MATERIALS, SETTING, METHODS This review includes work published in English until December 2014, and available through Pubmed. MAIN RESULTS AND THE ROLE OF CHANCE A few areas of research in stem cell and reproductive medicine were identified: in vitro gamete production, endometrial regeneration, erectile dysfunction amelioration, vaginal reconstruction. The stem cells studied range from pluripotent (embryonic stem cells and induced pluripotent stem cells) to monopotent stem cells, such as spermatogonial stem cells or mesenchymal stem cells. The vast majority of studies have been carried out in animal models, with data that are preliminary at best. LIMITATIONS, REASONS FOR CAUTION This review was not conducted in a systematic fashion, and reports in publications not indexed in Pubmed were not analyzed. WIDER IMPLICATIONS OF THE FINDINGS A much broader clinical knowledge will have to be acquired before translation to the clinic of stem cell therapies in reproductive medicine; patients and physicians should be wary of unfounded claims of improvement of existing medical conditions; at the moment, effective stem cell treatment for reproductive diseases and alterations is not available. © The Author 2015. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. Source


Bodri D.,Clinica EUGIN | Bodri D.,University of Barcelona | Sunkara S.K.,Assisted Conception Unit | Coomarasamy A.,Birmingham Womens Hospital
Fertility and Sterility | Year: 2011

Objective: To compare GnRH agonists and antagonists in oocyte-donation IVF treatment cycles by a systematic review and meta-analysis of trials. Design: Systematic review and meta-analysis of randomized clinical trials (RCT). Systematic literature searches were conducted, and all randomized trials that compared GnRH agonists with antagonists in oocyte-donation IVF treatment cycles were included. Study selection, quality appraisal, and data extractions were performed independently and in duplicate. Setting: Tertiary fertility center. Patient(s): A total of 1,024 oocyte donors treated in eight RCTs. Intervention(s): Comparison of GnRH agonists versus antagonists in oocyte-donation IVF treatment. Main Outcome Measure(s): Ongoing pregnancy, oocytes retrieved, duration of stimulation, gonadotropin consumption, and ovarian hyperstimulation syndrome incidence (OHSS) per randomized oocyte donor. Result(s): Meta-analysis of these studies showed no significant difference in ongoing pregnancy rate between the GnRH agonists and antagonists (risk ratio [RR] 1.15, 95% confidence interval [CI] 0.97 to 1.36). The duration of stimulation was significantly lower with the GnRH antagonist protocol (weighed mean difference [WMD] -0.90 days, 95% CI -1.61 to -0.20). No significant differences were observed in the number of oocytes retrieved (WMD -0.60, 95% CI -2.26 to +1.07), gonadotropin consumption (WMD -264 IU, 95% CI -682 to +154), or OHSS incidence (RR 0.62, 95% CI 0.18 to 2.15). Conclusion(s): No significant differences were observed in ongoing pregnancy rate or the number of retrieved oocytes after donor stimulation with GnRH agonist or antagonist protocols. © 2011 American Society for Reproductive Medicine, Published by Elsevier Inc. Source


Kawachiya S.,Kato Ladies Clinic | Bodri D.,Clinica EUGIN | Shimada N.,YuMe | Kato K.,Kato Ladies Clinic | And 2 more authors.
Fertility and Sterility | Year: 2011

In a 7-year (2002-2008) retrospective study of a large IVF program based on minimal ovarian stimulation and single ET (47,841 single ETs), monozygotic twinning occurred in 1.01% of 14,956 clinical pregnancies. Blastocyst culture was associated with a significantly increased monozygotic twinning risk (adjusted odds ratio, 2.04; 95% confidence interval, 1.29-4.48), whereas embryo freezing, type of stimulation protocol used, intracytoplasmic sperm injection fertilization, or zona removal did not influence its incidence. © 2011 by American Society for Reproductive Medicine. Source


Bodri D.,Clinica EUGIN | Colodron M.,Clinica EUGIN | Garcia D.,Fundacio Privada EUGIN | Obradors A.,Clinica EUGIN | And 2 more authors.
Fertility and Sterility | Year: 2011

Objective: To compare pregnancy and implantation rates with transvaginal (TV) versus transabdominal (TA) ultrasound-guided embryo transfer (ET). Design: Randomized, clinical trial registered at clinicaltrials.gov (NCT 01137461). Setting: Private, infertility clinic. Patient(s): Three-hundred thirty randomized recipients of donor oocytes. Intervention(s): Embryo transfer using TV (with empty bladder, using the Kitazato ET Long catheter) versus TA ultrasound guidance (with full bladder, using the echogenic Sure View Wallace catheter). Main Outcome Measure(s): Overall pregnancy, clinical pregnancy, implantation, and ongoing pregnancy rates. Duration and difficulty of ET. Patient-reported uterine cramping and discomfort, as evaluated by questionnaire. Result(s): No statistically significant differences were observed in clinical pregnancy 50.9% versus 49.4% (95% confidence interval of the difference: -9.2 to +12.2%), implantation 34.5% versus 31.4% (95% CI of the difference: -4 to +10.3%) between the TV and TA ultrasound-guided groups. Transfer difficulty (6% versus 4.2%) and uterine cramping (27.2% versus 18.3%) were not statistically significantly different between treatment groups. Total duration (154 ± 119 versus 85 ± 76 seconds) was statistically significantly higher in the TV ultrasound group. Light to moderate-severe discomfort related to bladder distension was reported by 63% of the patients in the TA ultrasound group. Conclusion(s): Transvaginal ultrasound-guided ET yielded similar success rates compared with the TA ultrasound-guided procedure without requiring the assistance of a sonographer. It was associated with increased patient comfort due to the absence of bladder distension. © 2011 by American Society for Reproductive Medicine. Source


Begueria R.,Clinica EUGIN | Garcia D.,Fundacio Privada EUGIN | Obradors A.,Clinica EUGIN | Poisot F.,Clinica EUGIN | And 2 more authors.
Human reproduction (Oxford, England) | Year: 2014

STUDY QUESTION: Does paternal age affect semen quality and reproductive outcomes in oocyte donor cycles with ICSI?SUMMARY ANSWER: Paternal age is associated with a decrease in sperm quality, however it does not affect either pregnancy or live birth rates in reproductive treatments when the oocytes come from donors <36 years old and ICSI is used.WHAT IS KNOWN ALREADY: The weight of evidence suggest that paternal age is associated with decreasing sperm quality, but uncertainty remains as to whether reproductive outcomes are affected. Although developed to treat severe sperm factor infertility, ICSI is gaining popularity and is often used even in the presence of mild male factor infertility.STUDY DESIGN, SIZE, DURATION: A retrospective cohort study spanning the period between February 2007 and June 2010. A total of 4887 oocyte donation cycles were included.PARTICIPANTS/MATERIALS, SETTING, METHODS: Fertilization was carried out by ICSI in all cycles included, and the semen sample used was from the male partner in all cases. The association of male age with semen parameters (volume, concentration, percentage of motile spermatozoa) was analyzed by multiple analysis of covariance. The association of male age with reproductive outcomes (biochemical pregnancy, miscarriage, ongoing pregnancy and live birth rate) was modeled by logistic regression, where the following covariates were introduced: donor age, recipient age, semen state (fresh versus frozen) and number of transferred embryos (3 and 2 versus 1).MAIN RESULTS AND THE ROLE OF CHANCE: We identified a significant relationship between paternal age and all sperm parameters analyzed: for every 5 years of age, sperm volume decreases by 0.22 ml (P < 0.001), concentration increases by 3.1 million sperm/ml (P = 0.003) and percentage motile spermatozoa decreases by 1.2% (P < 0.001). No differences were found in reproductive outcomes (biochemical pregnancy, miscarriage, clinical pregnancy, ongoing pregnancy and live birth) among different male age groups.LIMITATIONS, REASONS FOR CAUTION: The use of donor oocytes, while extremely useful in highlighting the role of male age in reproductive outcomes, limits the generalization of our results to a population of young women with older male partners. No data were available on perinatal and obstetrical outcomes of these pregnancies. Most (75%) cycles used frozen/thawed sperm samples which might have introduced a bias owing to loss of viability after thawing. ICSI was performed in all cycles to control for fertilization method; this technique could mask the natural fertilization rate of poorer sperm samples. Furthermore, we did not use stringent ICSI indications; and our data are therefore not generalizable to cases where only severe male factor is considered. However, male patients were of different racial background, thus allowing generalizing our results to a wider patient base.WIDER IMPLICATIONS OF THE FINDINGS: Our study suggests that paternal age does not affect reproductive outcomes when the oocyte donor is <36 years of age, indicating that ICSI and oocyte quality can jointly overcome the lower reproductive potential of older semen.STUDY FUNDING/COMPETING INTERESTS: This study was supported in part by Fundació Privada EUGIN. The authors have no conflicts of interest to declare. © The Author 2014. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. Source

Discover hidden collaborations