Marlon A Guerrero, MD, FACS

Assistant Professor, Otolaryngology
Associate Professor, Surgery
Member of the Graduate Faculty
Vice Chair, Clinical Quality Performance - Department of Surgery

Marlon Guerrero, MD, FACS, is an associate professor in the Division of General Surgery, Section of Surgical Oncology and vice chair of quality and performance in the Department of Surgery at the University of Arizona.

Dr. Guerrero received his BS in Biology from California State University, East Bay after graduating cum laude. He earned his medical degree from Meharry Medical College in Nashville, TN, where he was elected into the prestigious Alpha Omega Alpha Honor Medical Society. He completed his general surgery residency at the Michael E. DeBakey Department of Surgery at the Baylor College of Medicine in Houston, TX. There, he was awarded the St. Luke's Hospital Resident of the Year award in 2005.

Dr. Guerrero became interested in treating endocrine tumors and disorders after his training at the MD Anderson Cancer Center. He entered a prestigious endocrine surgery fellowship at the University of California, San Francisco under the mentorship of the legendary Dr. Orlo H. Clark. He joined the Department of Surgery at the University of Arizona in July 2009 as director of endocrine surgery and holds many adjunct positions within the College of Medicine.

Schedule an appointment with Dr. Guerrero

Research Interests

Pathogenesis of adrenocortical carcinoma
Clinical and molecular factors associated with advanced thyroid cancer
Optimizing the surgical approach in recurrent thyroid cancer
Study of thyroid carcinogenesis, advanced thyroid cancers
Studying systemic effects of hypercalcemia seen in primary hyperparathyroidism


  • MD: Meharry Medical College, 2003, BS, Biology: California State University East Bay
Honors and Awards
Resident of the Year Award, St. Luke?s Hospital, 2005
Baylor Medical College, General Surgery, 2003-2008
University of California San Francisco, Endocrine Surgery, 2008-2009
  1. Endocrine Surgery
Clinical Practice

Thyroid cancer
Thyroid goiter
Thyroid mass/nodule
Hyperthyroidism/Graves' disease
Parathyroid cancer
Primary hyperparathyroidism 
Secondary hyperparathyroidism
Tertiary hyperparathyroidism
Recurrent hyperparathyroidism
Adrenal mass/tumor
Hyperaldosteronism (Conn's syndrome)
Cushing's syndrome
Adrenal cancer
Adrenal metastasis
Gastrointestinal neuroendocrine tumors 
Pancreatic neuroendocrine tumors
Carcinoid syndrome/tumor
Abdominal mass/tumor
Gastric tumor/mass
Small bowel tumor/mass

Board Certifications
  • American Association of Endocrine Surgeons Certificate
  • American Board of Surgery - Diplomate, Endocrine Surgery