CALL US: 1-352-733-0111

A Multicenter, Observational, Open-Label, Single-Arm Study of Tysabri in Early Relapsing-Remitting Multiple Sclerosis in Anti-JCV Antibody Negative Patients


The purpose of this study is to find out if there are any assessments that might predict whether or not patients receiving Tysabri will remain free of disease and how effective Tysabri is at keeping patient who are in the early stages of RRMS free of disease.


tysabri, relapsing, multiple sclerosis, anti-jcv, negative

Principal Investigator

Scott Silliman, AST PROFESSOR



Contact Information

Be an Informed Participant

Before deciding to participate in a research study, take time to learn about clinical research, how it's conducted and your rights as a research participant. Following are some helpful resources from independent sources. Always remember that a clinical research study is research, not treatment.

Know Who to Contact

  • Eligibility: For questions about a specific study and who is eligible to participate, call or email the contact person listed for that study.
  • Your Rights: For questions about your rights as a research participant, contact the UF Institutional Review Boards at 352-273-9600.
  • Feedback: For general questions or feedback about study listings, email the UF Clinical and Translational Science Institute at

Other Resources

  • Join a national registry of volunteers willing to be contacted about research studies.

For Research Teams