Current Environment:

The Vascular Anomalies Center (VAC) at Boston Children's Hospital conducts basic, translational, and clinical research that continues to fuel the development of new, more effective therapies for vascular malformations and vascular tumors in children and adults — research that may one day even result in ways of preventing these anomalies. We have a responsibility to current and future patients to learn as much as possible from each patient we see.

Research on vascular anomalies at Boston Children's is deeply linked in the legacy of the late Judah Folkman, MD, founder of the hospital's Vascular Biology Program and past scientific director of the VAC. Dr. Folkman was a pioneer in the study of angiogenesis (the process by which blood vessels grow).

For instance, studies in the laboratory of Joyce Bischoff, PhD, a member of the Vascular Biology Program, have resulted in creation of the premier model of infantile hemangioma. Her work has helped define not only which medications work on these lesions but also how and why they work.


For 20 years, the VAC has been collaborating with genetic researchers in Brussels, Belgium, to understand the causes of vascular anomalies. These collaborations have resulted in several discoveries, such as:

These basic researchers are using tissue culture techniques and creating models of vascular anomalies in mice to understand the abnormal molecular signaling that causes malformed vascular channels. Someday soon, this basic science knowledge will be applied to control, and possibly prevent, vascular anomalies.

Unraveling lymphatic malformations

Our in-house capabilities have been greatly enhanced through our ongoing partnership with Matthew Warman, MD, of the Orthopedic Research Laboratories at Boston Children's. Together, VAC researchers and Dr. Warman have identified a common molecular basis — mutations in a gene called PIK3CA — for several lymphatic and vascular anomalies, namely CLOVES, Klippel-Trenaunay syndrome (KTS), fibroadipose vascular anomaly (FAVA), and isolated lymphatic malformations.

Defining and discovering new vascular anomalies

Proper diagnosis is the first step toward effective treatment. The VAC has led the pediatric field in defining vascular anomalies and establishing new diagnoses.

For instance, studies led by VAC co-director Ahmad Alomari, MD, MSc, FSIR, led to the definition of CLOVES, FAVA, and several other vascular anomalies as unique conditions. And VAC co-director John Mulliken, MD, in addition to developing simple techniques for the removal of infantile hemangiomas, produced the definitive text on the classification of vascular anomalies, work that continues to be updated and serve as a valuable resource to this day for all clinicians caring for patients with vascular anomalies.

Patient registries

Many vascular anomalies are rare disorders, and there is relatively little information available about long-term effects, treatments, and outcomes. Because the limited number of patients with these disorders are spread across the globe, it is very important that we gather patient data from multiple institutions and patients in a centralized registry, with the goal of expediting clinical understanding and improving care. The VAC has established two data registries for patients with vascular anomalies and their providers.

  • The Infantile Hepatic Hemangioma Registry collects information regarding the radiographic, physiologic, and biochemical presentation of hepatic infantile hemangiomas, their clinical progression, and their response to treatment.
  • The Lymphatic Anomalies Registry is seeking to collect clinical data from patients that could improve our understanding of lymphatic anomalies, including what complications to expect, which therapies are more effective than others, predictors of disease stability, and recurrence and inheritance patterns.

Clinical trials

To learn more about clinical trials occurring at Boston Children’s Hospital for patients with vascular anomalies, please contact Jami Brown at