The focus of our work is to understand the pathogenesis and the biology of thyroid cancers with the goal of identifying new molecular-based therapies. Thyroid cancer is the most common endocrine malignancy. Exposure to radiation during childhood confers increased predisposition to this disease. Our lab has been instrumental in characterizing many of the somatic genetic changes associated with thyroid tumor initiation and progression in both radiation-induced and sporadic thyroid cancer, and in defining the functional consequences using in vitro and in vivo experimental models.


Montero-Conde C, Ruiz-Llorente S, Dominguez JM, Knauf JA, Viale AJ, Sherman EJ, Ryder M, Ghossein RA, Rosen N, Fagin JA. Relief of feedback inhibition of HER3 transcription by RAF and MEK inhibitors attenuates their antitumor effects in BRAF mutant thyroid carcinomas. Cancer Discovery 2013, May;3(5):520-33.

Ho AL, Grewal RK, Leboeuf R, Sherman EJ, Pfister DG, Deandreis D, Pentlow KS, Zanzonico PB, Haque S, Gavane S, Ghossein RA, Ricarte-Filho JC, Dominguez JM, Shen R, Tuttle RM, Larson SM, Fagin JA. Selumetinib-enhanced radioiodine uptake in advanced thyroid cancer. Engl J Med 2013; Feb 14;368(7):623-32.

Chakravarty D, Santos E, Ryder M, Knauf J, Liao XH, West B, Bollag G, Kolesnick R, Thin T, Rosen N, Zanzonico P, Larson S, Refetoff S, Ghossein R, Fagin JA. Small-molecule MAPK inhibitors restore RAI incorporation in murine thyroid cancers with conditional BRAF activation. J Clin Invest. 2011 121(12):4700-11.

Franco AT, Malaguarnera R, Refetoff S, Liao XH, Lundsmith E, Kimura S, Pritchard C, Marais R, Davies TF, Weinstein LS, Chen M, Rosen N, Ghossein R, Knauf JA, Fagin JA. Thyrotrophin receptor signaling dependence of Braf-induced thyroid tumor initiation in mice. Proc Natl Acad Sci U S A. 2011 Jan 10 108(4):1615-20.

Chen X, Mitsutake N, LaPerle K, Akeno N, Zanzonico P, Longo V, Mitsutake S, Kimura E, Geiger H, Santos E, Wendel HG, Franco A, Knauf JA, Fagin JA. Endogenous Expression Of HrasG12V Induces Developmental Defects and Neoplasms with Copy Number Imbalances Of The Oncogene. Proc. Natl Acad Sci USA, 2009 12;106(19):7979-84.

Office phone:
Selected Achievements

President, American Thyroid Association (2012)

UK Clinical Endocrinology Trust Medal Lecture Award (2011)

Sydney Ingbar Award, American Thyroid Association (2008)

Merck Prize, European Thyroid Association Award (2007)

Association of American Physicians Award (2001)

American Society of Clinical Investigation Award (1998)

James A. Fagin

At Work: Endocrinology Service Chief James Fagin

Endocrinologist James Fagin’s thyroid cancer research involves understanding the disease’s biology and genetics and identifying new therapy targets.