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About Sickkids
About SickKids

Margaret (Peggy) A. Marcon, MD, FRCPC

The Hospital for Sick Children
Staff Gastroenterologist
Gastroenterology, Hepatology and Nutrition

University of Toronto
Associate Professor

Other Positions

Surrey Place Centre

Phone: 416-813-7735
Fax: 416-813-6531
Email: peggy.marcon@sickkids.ca
Alternate Contact: Sandra Layno
Alternate Email: sandra.layno@sickkids.ca

Brief Biography

Dr. Peggy Marcon is a gastroenterologist in the Division of Paediatric Gastroenterology, Hepatology and Nutrition. She graduated from McNeese State University in Louisiana and then attended medical school at Louisiana State University, Shreveport, graduating in 1983.  She undertook her pediatric residency at the Dallas Children’s Hospital and University of Texas Southwestern.  She then came to the Hospital for Sick Children to complete a fellowship in Gastroenterology. Once on staff she set up the Gastrointestinal Motility Testing Suite.  With her interest in gastrointestinal motility she joined and now runs the Dysphagia Clinic where children with medically based swallowing issues are seen.  She is part of the clinical and research team in Multidisciplinary Tracheal Esophageal Atresia and Congenital Diaphragmatic Hernia Clinics. She also holds a Celiac Clinic.

Research Interests

  • Gastrointestinal Motility
  • Swallowing Disorders
  • Eosinophilic GI Diseases
  • Foregut Congenital anomalies
  • Celiac Disease

Dr. Marcon’s research interests follow her areas of clinical interest and expertise.  In general the clinical studies have evolved from groups of patients seen in the Dysphagia (Swallowing Disorders) Clinic. This includes esophageal motility problems, such as Achalasia, and Eosinophilic Esophagitis. She has collaborative projects with other Canadian Centers in the area of Eosinophilic Esophagitis. As a member of the EA/TEF and CDH clinics they are looking at long term outcomes, burden of care and morbidity.  
Dr. Marcon also has an interest in Celiac Disease and have collaboration with Pediatric Endocrinology. They have a large multi-center study looking at dual diagnosis – Celiac Disease and Type 1 Diabetes, and the effect of gluten free diet.

External Funding

Juvenile Diabetes Research Foundation: A Randomized Controlled Trial to Evaluate the Efficacy and Safety of a Gluten-Free Diet in Patients with Asymptomatic Celiac Disease and Type 1 Diabetes, Celiac Disease and Diabetes - Dietary Intervention and Evaluation Trial (CD-DIE)

Autism Speaks: Autism Treatment Network Registry. 

John Garfield Campbell Fund for Pediatric GI Motility Research/SickKids Foundation: Introduction of a Pureed Diet in Children Dependent on Enteral Feeding for their Nutrition: Blenderized Enteral Nutrition Diet Study (BLEND).


For a complete list of publications, please see PubMed

McLaren A, Marcon M, Friedman J.  A 12-year old boy with difficulty swallowing.  Peadiatrics & Child Health 2013: 18(7): pp 353-355. CA

O'Gorman CS, Shulman R, Lara-Corrales I, Pope E, Marcon M, Grasemann H, Schneider R, Upton J, Sochett EB, Koltin D, Cohen E.  A child with autoimmune polyendocrinopathy candidiasis and ectodermal dysplasia treated with immunosuppression: a case report. J Med Case Rep 2013: 7(1) pp 44. CA

Levin D, Marcon MA, Rintala RJ, Jacobson D, Langer JC.  Inflammatory bowel disease manifesting after surgical treatment for Hirschsprung disease.  J Pediatr Gastroenterol Nutr 2012: 55(3) pp 272-277. Co-PA

Sud S, Marcon M, Assor E, Daneman D, Mahmud FH. Quality of life in children with diabetes and celiac disease: minimal impact of the double diagnosis.  Pediatr Diabetes 2012: 13(2): pp 163-169. Co-PA

Sud S, Marcon M, Assor E, Daneman D, Mahmud FH. Health professional attitudes regarding celiac disease screening and treatment in pediatric Type 1 diabetes. Canadian J Diabetes 2011: 35(4): 334-339. Co-PA

Sud S, Marcon M, Assor E, Palmert MR, Daneman D, Mahmud FH. Celiac disease and pediatric type 1 diabetes: diagnostic and treatment dilemmas. Int J Pediatr Endocrinol:161285; 2010. Epub 2010 Jun 23.. Co-PA

Chung J, Connolly B, Langer J, Marcon M, Temple M, Amaral JG.  Fluoroscopy-guided topical application of Mitomycin-C in a case of refractory esophageal stricture. J Vasc Interv Radiol 21(1):152-5, 2010. Co-PA

Pastor AC, Mills J, Marcon MA, Kim PCW.  A single centre 26-year experience with treatment of esophageal achalasia: is there an optimum method? J Pediatr Surgery 44:1349-54; 2009. Co-PA

Oliveira C, Zamakhshary M, Marcon P, Kim PC: Eosinophilic esophagitis and intermediate esophagitis after tracheoesophageal fistula repair: a case series. J Pediatr Surg 43(5):810-4; 2008.  Co-PA