Erinn Downs

Dr. Erinn Downs, D.O., is a medical educator and pathologist at the Mayo Clinic Comprehensive Cancer Center in Phoenix, Arizona, specializing in Laboratory Medicine and Pathology. She serves as Co-Director of the Histology Laboratory and participates in multidisciplinary tumor boards for breast and colorectal cancers, as well as inflammatory bowel disease conferences. Her career spans institutions including the University of Utah, Cleveland Clinic, and Mayo Clinic, with a focus on diagnostic pathology, cancer genetics, and translational research.

• Education: Doctor of Osteopathic Medicine (2001), two breast and GI pathology fellowships (2007-2008), residency in Anatomic and Clinical Pathology (2006).
• Research Interests:

  Breast cancer pathology, HER2 gene amplification, phyllodes tumors, lobular lesions, and molecular diagnostics. Key themes include cancer microenvironment analysis, biomarker validation (e.g., Ki-67), and diagnostic reproducibility in histopathology.

• Scientific Awards:
  • Outstanding Teaching Award (2016)
  • Joe Holden Clinical Excellence Award (2015)
  • Janet M. Glasgow Achievement Citation (2001)
• Professional Memberships:
  • International Society of Breast Pathology
  • Rodger C. Haggitt GI Pathology Society
  • United States and Canadian Academy of Pathology
  • College of American Pathologists