A photo of Timothy LeCras.

Associate Director of Admissions, Medical Scientist Training Program

Associate Professor, UC Department of Pediatrics



Biography & Affiliation


Vascular malformations are a kind of abnormal overgrowth or birthmark composed of blood vessels. Both vascular malformations and tumors in children and infants are associated with long-term problems and mortality risk. Further research and understanding of the underlying mechanisms that cause these vascular malformations and tumors are essential for effective treatment of these patients and for saving lives.

My research team studies vascular development as well as vascular malformations and disease. The goal of our research is to examine and find the mechanisms responsible for vascular development, abnormalities and vascular diseases. Our team has significant expertise in analyzing the molecular, genetic and cellular pathways behind human diseases.

In addition, my research lab studies the role of angiogenic factors and gene mutations in endothelial cells and how they lead to advancing the disease processes.

A major strength of our research is that we use human cells and samples to determine disease pathways and to identify new targeted treatments. Interactions with physicians at Cincinnati Children's and other children's hospitals have allowed us to use human blood samples to gain unique insights into disease processes. Recently, we have identified blood biomarkers for complex lymphatic anomalies (kaposiform lymphangiomatosis (KLA) and kaposiform hemangioendothelioma (KHE)). One of these biomarkers (Angiopoietin-2) is now available as a clinical blood test.

In collaboration with Dr. Boscolo’s laboratory at Cincinnati Children's, we have studied cells from patients and somatic gene mutations in endothelial cells that pinpointed hyper-activated signaling pathways and examined innovative treatment methods.

I have more than 25 years of experience in vascular development research and joined the team at Cincinnati Children’s Hospital Medical Center in 2001. My research has been published in journals such as Pediatric Blood and Cancer, Arteriosclerosis, Thrombosis, and Vascular Biology, American Journal of Respiratory Cell and Molecular Biology and Journal of Clinical Investigation.

Research Interests

Pathogenesis of vascular anomalies; vascular malformations; kaposiform lymphangiomatosis; capillary lymphatic venous malformations; pulmonary hypertension; pulmonary vascular disease; bronchopulmonary dysplasia

Academic Affiliation

Associate Professor, UC Department of Pediatrics

Research Divisions

Pulmonary Biology


Postdoctoral fellow: University of Virginia, Charlottesville, VA, 1993-1996.

PhD: University of Cambridge, UK, 1988-1992.

BSc: Biochemistry, Brunel University, London, UK, 1983-1987.


Signaling pathways and inhibitors of cells from patients with kaposiform lymphangiomatosis. Boscolo, E; Pastura, P; Glaser, K; Goines, J; Hammill, AM; Adams, DM; Dickie, P; Dickie, BH; Le Cras, TD. Pediatric Blood and Cancer. 2019; 66.

Cellular and molecular mechanisms of PIK3CA-related vascular anomalies. Le Cras, TD; Boscolo, E. 2019; 1:H33-H40.

Ponatinib Combined With Rapamycin Causes Regression of Murine Venous Malformation. Li, X; Cai, Y; Goines, J; Pastura, P; Brichta, L; Lane, A; Le Cras, TD; Boscolo, E. Arteriosclerosis, Thrombosis, and Vascular Biology. 2019; 39:496-512.

Hypoxia-induced Pulmonary Hypertension in Different Mouse Strains: Relation to Transcriptome. Ikeda, KT; Hale, PT; Pauciulo, MW; Dasgupta, N; Pastura, PA; Le Cras, TD; Pandey, MK; Nichols, WC. American Journal of Respiratory Cell and Molecular Biology. 2019; 60:106-116.

IL-17A enhances IL-13 activity by enhancing IL-13-induced signal transducer and activator of transcription 6 activation. Hall, SL; Baker, T; Lajoie, S; Richgels, PK; Yang, Y; McAlees, JW; van Lier, A; Wills-Karp, M; Sivaprasad, U; Acciani, TH; et al. Journal of Allergy and Clinical Immunology. 2017; 139:462-471.e14.

Angiopoietins as serum biomarkers for lymphatic anomalies. Le Cras, TD; Mobberley-Schuman, PS; Broering, M; Fei, L; Trenor, CC; Adams, DM. Angiogenesis. 2017; 20:163-173.

Epidermal growth factor receptor signalling regulates granulocyte-macrophage colony-stimulating factor production by airway epithelial cells and established allergic airway disease. Acciani, TH; Suzuki, T; Trapnell, BC; Le Cras, TD. Clinical and Experimental Allergy. 2016; 46:317-328.

Placenta growth factor augments airway hyperresponsiveness via leukotrienes and IL-13. Mpollo, ME M; Brandt, EB; Shanmukhappa, SK; Arumugam, PI; Tiwari, S; Loberg, A; PiIlls, D; Rizvi, T; Lindsey, M; Jonck, B; et al. Journal of Clinical Investigation. 2016; 126:571-584.