Maoxin Wu, MD, PhD
Department of Pathology, Mount Sinai School of Medicine and Mount Sinai Medical Center, New York, NY

Katherine Sun, MD, PhD
Department of Pathology, Mount Sinai School of Medicine and Mount Sinai Medical Center, New York, NY

Joan Gil, MD
Department of Pathology, Mount Sinai School of Medicine and Mount Sinai Medical Center, New York, NY

Li Gan, MD
Department of Pathology, Mount Sinai School of Medicine and Mount Sinai Medical Center, New York, NY

David E. Burstein, MD
Department of Pathology, Mount Sinai School of Medicine and Mount Sinai Medical Center, New York, NY

Keywords: XIAP; p63; Thymic hyperplasia; Thymoma

Upon completion of this activity, you will be able to:

• list the types of cells in the thymus likely to be reactive with antibodies to p63.
• define possible use of X-linked inhibitor of apoptosis protein (XIAP) as an immunohistochemical marker in thymic specimens.