Clinical trial Recruiting at 1 site Phase1; Phase2 Interventional Ages 19 Weeks to 25 Weeks

Using stem cells to improve fetal surgery for spina bifida

Official title: Phase 1/2a Trial of Placental Mesenchymal Stem Cells for Repair of Fetal Myelomeningocele

Run by University of California, Davis · NCT04652908 · Data updated 2026-11-12

This study is testing whether adding stem cells to fetal surgery can help improve walking and movement in babies with a severe form of spina bifida.

Quick facts

PhasePhase1; Phase2
Study typeInterventional
Ages19 Weeks to 25 Weeks
SexAll
Enrollment55 (estimated)
SponsorUniversity of California, Davis
Academic / other
Locations1 site (Sacramento, California)
StatusRecruiting
StartedJune 21, 2021
Main results expectedMarch 2027
Study endsMarch 2027
Registry record updatedJanuary 20, 2026
Trial IDNCT04652908 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates for this study are pregnant women with a diagnosis of myelomeningocele at specific gestational ages and who meet the eligibility criteria outlined in the MOMS trial.

Probably not a fit

Patients with multifetal pregnancies or other significant fetal anomalies unrelated to myelomeningocele may not benefit from this study.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This clinical trial investigates the use of placental mesenchymal stem cells in conjunction with fetal surgery to repair myelomeningocele, a severe form of spina bifida. Building on previous findings from the MOMS trial, which demonstrated some improvement in motor function with in-utero surgery, this study aims to enhance outcomes by adding stem cells to the surgical procedure. The trial will assess both the safety and efficacy of this combined approach in improving walking ability and overall motor function in affected infants. Participants will be monitored for improvements in their neurological function post-surgery.

Why it matters

Potential benefit: If successful, this approach could significantly enhance motor function and quality of life for children born with myelomeningocele.

How similar studies have gone: While the MOMS trial showed promise for fetal surgery in myelomeningocele, the addition of stem cells represents a novel approach that has not yet been extensively tested in humans.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

Eligibility for fetal surgery per the MOMS trial, which are:

* Myelomeningocele (including myeloschisis) at any level from T1 through S1 with hindbrain herniation. Lesion level will be confirmed by ultrasound and hindbrain herniation will be confirmed by MRI at the UC Davis Fetal Center
* Maternal age ≥18 years
* Gestational age at enrollment between 19 weeks 0 days and 25 weeks 6 days gestation as determined by clinical information and evaluation of first ultrasound
* Normal karyotype. Results by fluorescence in situ hybridization (FISH) will be acceptable if the patient is greater than 24 weeks gestation;

Exclusion Criteria:

Not being eligible for fetal surgery per the MOMS trial, which includes:

* Multifetal pregnancy
* Insulin dependent pregestational diabetes
* Fetal anomaly not related to myelomeningocele.
* Kyphosis in the fetus of 30 degrees or more
* Current or planned cerclage or documented history of incompetent cervix, placenta previa or placental abruption
* Short cervix \< 20 mm measured by cervical ultrasound
* Obesity as defined by body mass index of 35 or greater
* Previous spontaneous singleton delivery prior to 37 weeks
* Maternal-fetal Rh isoimmunization, Kell sensitization or a history of neonatal alloimmune thrombocytopenia
* Maternal HIV or Hepatitis-B status positive due to the increased risk of transmission to the fetus during maternal-fetal surgery. If the patient's HIV or Hepatitis B status is unknown, the patient must be tested and found to have negative results before she can be enrolled
* Known Hepatitis-C positivity. If the patient's Hepatitis C status is unknown, she does not need to be screened
* Uterine anomaly such as large or multiple fibroids or Müllerian duct abnormality
* Other maternal medical condition which is a contraindication to surgery or general anesthesia. This includes any patient with a previous hysterotomy in the active segment of the uterus (whether from a previous classical cesarean, uterine anomaly such as an arcuate or bicornuate uterus, major myomectomy resection, or previous fetal surgery)
* Patient does not have a support person (e.g., husband, partner, mother)
* Inability to comply with the travel and follow-up requirements of fetal surgery
* Patient does not meet other psychosocial criteria (as determined by the psychosocial interviewer) to handle the implications of fetal surgery
* Participation in another intervention study that influences maternal and fetal morbidity and mortality or participation in this trial in a previous pregnancy;
* Maternal hypertension which would increase the risk of preeclampsia or preterm delivery (including, but not limited to: uncontrolled hypertension, chronic hypertension with end organ damage and new onset hypertension in current pregnancy)
* Active COVID-19 infection at time of fetal surgery as determined by positive test

Where it's running

  • UC Davis Health
    Sacramento, California, United States
    Recruiting

Study contacts

Similar studies

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How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.