A Study to Learn How Nusinersen (Spinraza) Affects Participants With Spinal Muscular Atrophy (SMA) Who Took it Before or During Pregnancy And About The Health of Their Babies

Last updated: June 9, 2025
Sponsor: Biogen
Overall Status: Active - Recruiting

Phase

N/A

Condition

Muscular Dystrophy

Spinal Muscular Atrophy

Myasthenia Gravis (Chronic Weakness)

Treatment

No Intervention

Clinical Study ID

NCT05789758
CH-SPN-12180
232SM405
  • Ages 18-54
  • Female

Study Summary

In this study, researchers will know more about the effects of nusinersen, also known as Spinraza®, in pregnant participants with spinal muscular atrophy, also known as SMA. This is a drug available for doctors to prescribe for people with SMA. Due to the current treatment options that exist, people with SMA may now reach the age where they can become pregnant. But, there is not enough information known yet about what the effects of nusinersen may be on pregnant people with SMA or on their babies.

This is known as an "observational" study, which collects health information about study participants without changing their medical care. The pregnant participants for this study will be found using 3 different groups of SMA study research centers:

  • ISMAR-US (International SMA Registry in the United States)

  • UK Adult SMA-REACH (Adult SMA Research and Clinical Hub in the United Kingdom)

  • SMArtCARE (Austria, Germany, and Switzerland)

The main goal of this study is to collect birth and health information from 3 groups of participants and their babies. These groups are:

  • Those who received nusinersen 14 months before the first day of their last period before getting pregnant

  • Those who received nusinersen 14.5 months before the day they got pregnant

  • Those who received nusinersen during any time in their pregnancy

The main questions researchers want to learn about in this study are:

  • Loss of pregnancy overall

  • Loss of pregnancy before the baby was 20 weeks old

  • Loss of pregnancy after the baby becomes 20 weeks old

  • Live births

  • Loss of the baby after birth

  • Babies who have problems in their body that develop during pregnancy

  • Babies who are small for their age while in the participant's uterus

  • Pregnancy that happens outside of the uterus

  • How many participants die during pregnancy, while the baby is being born, and up to 12 weeks after delivering the baby

  • Babies who develop problems in their body after birth

Researchers will also compare this information to people without SMA who have not received nusinersen.

This study will be done as follows:

  • Information will start being collected when the participant decides to join the study.

  • Participants will be contacted at each trimester (about every 3 months) to learn about their health and pregnancy.

  • Participants' doctors will be contacted at each trimester, when the participants are about 6 or 7 months pregnant, and about 4 weeks after the delivery of the baby.

  • The babies' doctors will be contacted when the baby is 1, 2, 6, 12, 18, and 24 months old.

  • Each participant will be in the study until the end of their pregnancy and for up to 12 weeks after delivery. Each baby will be in the study for up to 2 years after birth.

  • The study overall will last at least 10 years from when the first participant joins the study.

Eligibility Criteria

Inclusion

Key Inclusion Criteria:

  • Participant who is currently pregnant (or was pregnant during the relevant exposurewindow) and enrolled in the United States (US) network of the ISMAR registry, theUnited Kingdom (UK) Adult SMA REACH, or the Germany, Austria, or Switzerland networkof the SMArtCARE registry

  • Genetic documentation of spinal muscular atrophy linked to chromosome 5q (5q SMA)

  • Documentation that the participant was exposed to nusinersen up to 14 months priorto the first day of their LMP before conception, 14.5 months before conception,and/or at any time during their pregnancy

Exclusion

Key Exclusion Criteria:

  • Treatment with risdiplam at any time from the first day of their LMP, 2 weeks priorto the date of conception (approximately 5 half-lives), and/or plans to receivetreatment with risdiplam during pregnancy

NOTE: Other protocol defined Inclusion/Exclusion criteria may apply

Study Design

Total Participants: 20
Treatment Group(s): 1
Primary Treatment: No Intervention
Phase:
Study Start date:
December 15, 2023
Estimated Completion Date:
October 31, 2033

Study Description

The primary objectives of the study are to prospectively evaluate pregnancy complications and outcomes in participants with SMA, birth outcomes and adverse effects in infants born to participants with SMA, who were exposed to nusinersen up to 14 months prior to the first day of their last menstrual period (LMP) before conception, 14.5 months before the date of conception, and/or at any time during their pregnancy. The secondary objective of the study is to evaluate pregnancy outcomes in participants with SMA exposed to nusinersen as compared with participants without SMA who were not exposed to nusinersen (e.g., participants from external, general population comparators).

Connect with a study center

  • St George's University NHS Foundation Trust

    London, Greater London SW17 0QT
    United Kingdom

    Active - Recruiting

  • The Northern Care Alliance NHS Foundation Trust

    Salford, Greater Manchester M6 8HD
    United Kingdom

    Active - Recruiting

  • University Hospital Southampton NHS Foundation Trust

    Southampton, Hampshire SO16 6YD
    United Kingdom

    Active - Recruiting

  • Nottingham University Hospitals Trust

    Nottingham, Nottinghamshire NG5 1PB
    United Kingdom

    Active - Recruiting

  • The Robert Jones and Agnes Hunt Orthopaedic Hospital NHS Foundation Trust

    Oswestry, Shropshire SY10 7AG
    United Kingdom

    Active - Recruiting

  • Sheffield Teaching Hospitals NHS Foundation Trust

    Sheffield, South Yorkshire S10 2SB
    United Kingdom

    Active - Recruiting

  • The Newcastle upon Tyne Hospitals NHS Foundation Trust

    Newcastle upon Tyne, Tyne And Wear NE7 7ND
    United Kingdom

    Active - Recruiting

  • University Hospitals Birmingham NHS Foundation Trust

    Birmingham, West Midlands B15 2GW
    United Kingdom

    Active - Recruiting

  • North Bristol NHS Trust

    Bristol, BS10 5NB
    United Kingdom

    Active - Recruiting

  • Research Site

    Cambridge, Massachusetts 02142
    United States

    Site Not Available

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