In this episode of “Ask the Expert," Krissy Dilger of SRNA spoke with Dr. Barbara Willekens of the University of Antwerp about CAR-T cell therapy, explaining it as genetically engineered T cells (autologous or allogeneic) designed to recognize targets like CD19 on B cells and destroy them [00:01:19]. Dr. Willekens reviewed CAR-T’s development since the 1980s for blood cancers, its severe potential side effects, and why successes targeting B cells prompted exploration in autoimmune diseases, including emerging trials for NMOSD and MOGAD [00:04:25]. She described patient selection, the clinical-trial process, expected B-cell reconstitution in about three months, and risks [00:18:55]. Dr. Willekens discussed research questions, including blood-brain barrier interactions, alternative CAR delivery, and future directions comparing approaches, targets, scalability, and cost [00:31:24].

Barbara M.P. Willekens, MD, PhD, is a neurologist and Clinical Head of Neurology for multiple sclerosis (MS) and other CNS neuroimmunological diseases at Antwerp University Hospital, Belgium, and an Assistant Professor of Neurology at the University of Antwerp. She is an expert in MS and rare neuroimmunological diseases. She founded the University Neuroimmunology Center Antwerp (UNiCA), a multidisciplinary center bringing together patient care, research and education, which has been recognized as a SRNA Center of Excellence for rare neuroimmune disorders. Her clinical and academic career has focused on translating advances in neuroscience and immunology into better treatments and care for people living with neuroinflammatory diseases.

Dr. Willekens leads and contributes to research ranging from early-stage translational science to international clinical trials and real-world studies. Her work includes clinical and translational research into immune tolerance and cellular therapies such as tolerogenic dendritic cells and CAR-T cell therapy, as well as approaches aimed at promoting remyelination and neuroprotection in MS and developing biomarkers for more personalized care. She has been a principal investigator in multiple academic trials and industry-led clinical trials and has helped build international collaborations and registries that generate evidence to improve treatment and patient care. Dr. Willekens plays a leadership role in the wider neuroimmunology community: she is Co-chair of the European Academy of Neurology's Coordinating Panel for Translational Neurology and Neuroscience, has previously served as Co-chair of its Scientific Panel for Neuroimmunology, is a member of the MSBase Scientific Leadership Group, of MOGAD Eugen Devic European Network, and is a driving force behind the International Susac Syndrome Consortium. Her leadership reflects a commitment not only to advancing science, but also to bringing researchers, clinicians and patients together to turn scientific progress into meaningful improvements in everyday care.

00:00 Welcome and Guest Intro

01:19 CAR-T Explained Simply

04:25 From Cancer to Autoimmunity

06:35 Why NMOSD and MOGAD

10:58 B Cells and Targets

15:56 One Time Treatment Question

18:55 Who Should Get CAR-T

21:46 What Patients Experience

26:12 Immune Reset and Side Effects

31:24 Dr. Willekens' Lab Research

35:01 Next Steps and Open Questions

36:24 Future CAR-T Approaches

40:12 Closing Thoughts

The "Community Meets Clinic" podcast series introduces clinicians and healthcare personnel specializing in rare neuroimmune disorders. In this episode, Krissy Dilger of SRNA spoke with Drs. Brenda Banwell and Haiwen Chen of Johns Hopkins Children’s Center, a designated Center of Excellence in Rare Neuroimmune Disorders. They shared about their paths into pediatric neurology and focus on rare pediatric neuroimmune disorders [00:01:49]. They described the rapid evolution of diagnosis and treatment over the past 30 years, including advances in MS, MOGAD, and aquaporin-4 disease, expanded pediatric inclusion in diagnostic criteria and trials, and improved outcomes with high-efficacy therapies. The doctors outlined their research approaches—Dr. Banwell’s integrative, imaging-focused team science [00:08:45] and Dr. Chen’s clinical research including a project on IVIG duration for relapsing pediatric MOGAD [00:11:00]. The discussed their multidisciplinary clinic supports, continuity into adulthood within one health system, and emphasis on availability, collaboration, community resources, and hope for the future [00:13:35].

View the medical profile of Dr. Brenda Banwell:

https://profiles.hopkinsmedicine.org/provider/brenda-banwell/3154504

View the medical profile of Dr. Haiwen Chen:

https://profiles.hopkinsmedicine.org/provider/haiwen-chen/2703784

Brenda Banwell is the director of the Department of Pediatrics, as well as pediatrician-in-chief and co-director of Johns Hopkins Children’s Center, where she helps manage the hospital’s many clinical and research centers. Dr. Banwell is a renowned expert in the research and treatment of pediatric multiple sclerosis (MS) and other neuroimmune disorders. She specializes in and studies the use of neuroimaging to assess the clinical and cognitive impact of the conditions, as well as the function of the immune system in children with these disorders. Dr. Banwell has published more than 250 manuscripts in high-impact journals, along with over 25 book chapters. In addition, she has over 200 national and international invited lectureships and visiting professorships.

An advocate for pediatric multiple sclerosis needs and research, Dr. Banwell serves as chair of the International Medical and Scientific Board of the Multiple Sclerosis International Federation, and the Myelin Oligodendrocyte Glycoprotein Antibody–Associated Disease (MOGAD) International Research Consortium. She is also chair of the pediatric committee of the National Institutes of Health NeuroNEXT program, which conducts studies on treatments for neurological diseases through academic, private, and industry collaborations. Dr. Banwell currently serves as past-chair of the International Pediatric Multiple Sclerosis Study Group.

Dr. Haiwen Chen is a pediatric neurologist who specializes in caring for children with pediatric onset neuroinflammatory and neuroinfectious diseases, with particular interests in demyelinating disorders and myelitis. Dr. Chen earned her MD and PhD from the University of Maryland School of Medicine. She completed a pediatric neurology residency and fellowship training in neuroimmunology and neurological infectious diseases at The Johns Hopkins Hospital. Dr. Chen’s research training focused on understanding synaptic structure and function using molecular biology and microscopy techniques. Her current research focuses on understanding how oligodendrocyte affect synaptic function in health and disease with the goal of developing strategies for preserving and restoring synaptic function to treat cognitive dysfunction in demyelinating disorders.

00:00 Introduction

01:49 Why Child Neurology

04:24 Choosing Neuroimmunology

08:45 Dr. Banwell's Research Focus

11:00 Dr. Chen's Research Focus

13:35 Clinic Team and Referrals

17:24 Continuity Into Adulthood

20:55 Self Care and Balance

25:26 Advice for New Families

28:57 Hope Through Collaboration

33:45 Closing

In this SRNA “Ask the Expert” episode, Krissy Dilger of SRNA introduced the Rare Neuroimmune Disorder Symposium (RNDS), a three-day hybrid event in Dallas, Texas (October 15–17, 2026) that connects individuals and families with leading experts for education on diagnosis, symptom management, rehabilitation, mental health, and research. You can view details about RNDS, including the agenda and registration, on the event page:

https://www.srna.ngo/2026-rnds

SRNA founder and president Sandy Siegel recounted how early community isolation and a 1999 gathering helped spark ongoing symposia [00:08:37]. He described the development of a medical advisory board and collaboration with Johns Hopkins that supported research growth, evolving diagnostic definitions, and advances such as plasma exchange and newer therapies for conditions including TM, NMOSD, ON, ADEM, AFM, and MOGAD [00:12:11]. Community support coordinator Leah Campbell shared about her neuromyelitis optica (NMO) diagnosis and described RNDS as invaluable for expert access, treatment decision support, and meaningful connection with others who share similar experiences [00:34:45].

Sandy Siegel is the President of SRNA. Sandy got involved with SRNA shortly after his wife, Pauline, contracted TM in 1994 at the age of 35. At the time of her onset, Pauline was a kindergarten teacher. Sandy has been an officer and a board member of SRNA since its inception. Sandy has also served as SRNA’s newsletter and journal editor during his more than two decades of service to the organization. Sandy is a cultural anthropologist with specializations in Native Americans, psychological anthropology, and culture change. Sandy has worked as an adjunct professor at Capital University, Franklin University, the Urban/Rural Program of the College of Great Falls, and the Intertribal Education Center of the Fort Belknap Reservation. Sandy retired from the State of Ohio in 2011 after more than 35 years of service. Sandy returned to college in the fall of 2011 as a photography student at Columbus State Community College. Sandy and Pauline have two sons, four grandsons, and one granddaughter.

Leah Campbell is SRNA's Community Support Coordinator. Leah was diagnosed with neuromyelitis optica (NMO) in May 2006 after 17 years of unexplained symptoms and misdiagnosis. She was the first blind student and salutatorian of Altus High School and the first blind graduate of Rhodes College, earning a BA in mathematics. Following graduation and after a treatment for a disease she had been misdiagnosed with, she became quadriplegic and lost sensation of touch, having to relearn how to navigate life as both blind and paralyzed. She is dedicated to using her experiences to support and advocate for others.

00:00 Welcome

01:03 What the Rare Neuroimmune Disorders Symposium Offers

02:35 Meet Sandy and Leah

03:13 Origins of RNDS

08:37 1999 Breakthrough Symposium

12:11 Centers of Excellence Growth

22:31 How RNDS Evolved

31:30 Why RNDS Still Matters

34:45 Leah's Journey with NMOSD

35:43 Leah's RNDS Experience

38:40 Advice and Closing