Drug or treatment

Marstacimab clinical trials

• 5Clinical trials
• 1New in 30 days
• 28Countries

Newest trials

All recruiting trials (5)

• Marstacimab for mild to moderate hemophilia A or B in people without inhibitors

  This study tests whether weekly injections of marstacimab can reduce bleeding in adolescents and adults with mild to moderate hemophilia A or B who don’t have inhibitors.

  Recruiting Phase 3 Pfizer · Flowood, Mississippi · NCT07923981

• Marstacimab experiences in adolescents and adults with hemophilia

  This registry will collect experiences from adolescents and adults with hemophilia who are receiving marstacimab to see if they prefer subcutaneous injections and to track treatment burden and bleeding rates.

  Recruiting at 2 sites Institute of Hematology & Blood Diseases Hospital, China · Xiamen, Fujian and 1 other locations · NCT06992076

• Switching from Emicizumab to Marstacimab in Severe Hemophilia A

  This study is testing if switching from emicizumab to marstacimab is safe and how well the body handles the new medication in people with severe hemophilia A.

  Recruiting at 7 sites Phase 1 Pfizer · La Jolla, California and 9 other locations · NCT06703606

• Testing marstacimab for treating hemophilia in children

  This study is testing a new medication called marstacimab to see if it can help children with severe hemophilia control their bleeding and improve their health.

  Recruiting at 51 sites Phase 3 Pfizer · Salt Lake City, Utah and 62 other locations · NCT05611801

• Long-term treatment with marstacimab for hemophilia patients

  This study is testing a long-term treatment called marstacimab to see if it can safely help people with severe hemophilia A or B manage their condition better.

  Recruiting at 68 sites Phase 3 Pfizer · Iowa City, Iowa and 77 other locations · NCT05145127

Quick answers

How many clinical trials of Marstacimab are recruiting right now?

5, as of November 12, 2026. 1 of them was first registered in the last 30 days. We update this list each time we refresh our data from ClinicalTrials.gov.

Where are these trials running?

In 28 countries. The most sites are in United States (4 trials), China (3 trials), India (3 trials), Turkey (Türkiye) (3 trials), Argentina (2 trials). Each study page lists its sites and which ones are recruiting.

What phases are they in?

Phase 3: 3, Phase 1: 1. Trials with no phase listed are usually device, behavioural or observational studies.

How do I join one?

Open a study, check the "Is this trial a fit for you?" section, then contact the study team listed on the page. They will ask a few screening questions. Asking is free and does not commit you to anything. Talk it over with your doctor first.

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