A Study to Evaluate the Safety, Efficacy, Pharmacokinetics and Pharmacodynamics of M281 Administered to Pregnant Women at High Risk for Early Onset Severe Hemolytic Disease of the Fetus and Newborn (HDFN)

Last Updated   November 25, 2021 - 00:00

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  • Gender
  • Age
    18+ years
  • Phase
    phase 2
    The drug or treatment is given to a larger group of people to see if it is effective and to better understand its safety.
  • Sites
    17 sites
  • Status


The purpose of this study is to evaluate the safety in mother and neonate/infant of M281 administered to pregnant women who are at high risk for Early Onset Severe Hemolytic Disease of the Fetus and Newborn (EOS-HDFN). The effectiveness of the investigational drug M281 will be measured by looking at the percentage of participants with live birth at or after gestational age (GA) 32 weeks and without a need for an intrauterine transfusion (IUT) throughout their entire pregnancy.


  • Hemolytic Disease of the Fetus and Newborn


Inclusion Criteria:

  • • Approximately 15 eligible participants and their offspring will be enrolled
  • • Each participant must meet all of the following criteria to be enrolled in the study:
  • •- Female and ≥18 years of age
  • •- Pregnant to an estimated gestational age of between 8 up to 14 weeks
  • • A previous pregnancy with a gestation that included at least one of the following prior to week 24 gestation:
  • •- Severe fetal anemia, defined as hemoglobin ≤0.55 multiples of the median (MOM) for gestational age
  • •- Fetal hydrops with peak systolic velocity MOM ≥1.5
  • •- Stillbirth with fetal or placental pathology indicative of hemolytic disease of the fetus and newborn (HDFN)
  • • Maternal alloantibody titers for anti-D of ≥32, or anti-Kell titers ≥4
  • • Free fetal deoxyribonucleic acid consistent with an antigen positive fetus (blood sample taken from mother)
  • • MaternaI evidence for Immunity to measles mumps, rubella, and varicella, as documented by serologies performed during Screening. If initial serologies are borderline or negative, they may be repeated at a second lab. Alternatively, vaccination records can be used to support evidence of immunity.
  • • Screening immunoglobulin G and albumin levels within the laboratory normal range for gestational age of pregnancy
  • • Willing to receive standard of care with intrauterine transfusion if clinically indicated
  • • Agree to receive recommended vaccinations per local standard of care for both mother and child throughout the course of the study
  • • It is recommended that patients are up-to-date on age-appropriate vaccinations prior to screening as per routine local medical guidelines. For study patients who received locally-approved (and including emergency use-authorized) Coronavirus Disease 2019 (COVID-19) vaccines recently prior to study entry, follow applicable local vaccine labelling, guidelines, and standard of care for pregnant women receiving immune-targeted therapy when determining an appropriate interval between vaccination and study enrolment

Exclusion Criteria:

  • • Currently pregnant with multiples (twins or more)
  • • Pre-eclampsia In current pregnancy or history of pre-eclampsia in a previous pregnancy
  • • Gestational hypertension in the current pregnancy
  • • Current unstable hypertension
  • • History of severe or recurrent pyelonephritis, 4 or more lower urinary tract infections in the past year or in a previous pregnancy
  • • History of genital herpes infection
  • • Active Infection at Screening or Baseline with Coxsackie, syphilis, cytomegalovirus, toxoplasmosis or herpes simplex 1 or 2, as evidenced by clinical signs and symptoms (evidence for prior Infection or exposure, but without clinical signs and symptoms of active infection is acceptable)
  • • Active infection with tuberculosis as evidenced by positive QuantiFERON-tuberculosis testing
  • • Requires treatment with corticosteroids or immunosuppression for disorders unrelated to the pregnancy (use of low-potency topical corticosteroids or intra-articular corticosteroids is permitted)
  • • Received live vaccine within 3 months prior to first intravenous infusion of nipocalimab
  • • Currently receiving an antibody-based drug or an Fc-fusion protein drug
  • • Received plasmapheresis and/or intravenous immunoglobulin during the current pregnancy for treatment of HDFN
  • • COVID-19 infection: during the 6 weeks prior to baseline, have had any of: a) confirmed severe acute respiratory syndrome coronavirus(-2) (SARS-CoV-2) (COVID-19) infection (test positive), or; b) suspected SARS-CoV-2 infection (clinical features without documented test results), or; c) close contact with a person with known or suspected SARS-CoV-2 infection. Exception: may be included with a documented negative result for a validated SARSCoV-2 test: obtained at least 2 weeks after conditions a), b), c) above (timed from resolution of key clinical features if present, example fever, cough, dyspnea) and; with absence of all conditions a), b), c) above during the period between the negative test result and the baseline study visit



Locations in:
Australia, Belgium, Canada, Germany, Spain, United Kingdom, Netherlands, Sweden, United States
City or Province (17) Country (9) Status
Sydney, NSW Liverpool Hospital Australia
Leuven Universitair Ziekenhuis Leuven Belgium
Toronto, ON Mount Sinai Hospital Canada
Montréal, QC CHUM - Centre hospitalier universitaire de Montreal Canada
Vancouver, BC British Columbia Children's Hospital Canada
Giessen, HE Justus-Liebig-Universität Gießen, Kinderherzzentrum Germany
Birmingham, WMD Birmingham Children's Hospital United Kingdom
London University College London Hospitals NHSFT United Kingdom
Leiden Leiden University Medical Center Netherlands
Stockholm Karolinska Universitetssjukhuset, Huddinge Sweden
Cincinnati, OH University of Cincinnati United States
New York, NY Columbia University Medical Center United States
Pittsburg, PA University of Pittsburgh United States
Salt Lake City, UT University of Utah United States
Portland, OR Oregon Health and Science University United States
San Francisco, CA University of California San Francisco United States

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