Dr. Cohen practices General Gastroenterology with additional special focuses on Crohn's Disease, Ulcerative Colitis, and non
surgical treatment of hemorrhoids. Dr. Cohen is originally from Potomac, Maryland. He completed his undergraduate work at
Cornell University and medical school at the University of Maryland. Dr. Cohen moved to Chicago in 1998 where he completed his
residency at Northwestern followed by a 4 year combined clinical and research GI fellowship under an NIH training grant at the
University of Chicago. He has been in practice at Northwestern since 2005.
Dr. Cohen is board certified in Gastroenterology and is an Assistant Professor of Clinical Medicine at Northwestern University. He
is a fellow of both the American College of Gastroenterology and the American Gastroenterological Association. He is actively
involved in teaching medical students as well as GI fellows, and has received multiple teaching awards from the Northwestern
University Feinberg School of Medicine. He has published multiple papers and also serves as a peer reviewer.
Dr. Cohen's practice philosophy is simple: he takes care of his patients the way he would want any doctor to take care of him.
Appointments are as long as they need to be. Phone calls and electronic messages to the doctor are always returned by the doctor
himself, and usually within a few hours. Dr. Cohen is part of the private practice community at Northwestern Memorial Hospital. To
find other Northwestern private practice physicians, click this link.
Dr. Cohen is married with three children and one dog. He spends his free time with his family, building model rockets with his
kids, skiing in the winter, and volunteering as camp doctor at his kids' summer camps in the North Woods of Wisconsin.
Click here to read an interview of Dr. Cohen in VoyageChicago.
Areas of Interest: Celiac Disease, Colon Cancer Screening, Constipation, Crohn's Disease, Diarrhea, Familial Colon Cancer
Syndromes, Hemorrhoid Treatment, Inflammatory Bowel Disease, Peptic Ulcer Disease, Rectal Bleeding, Swallowing Disorders,
Office Hours: Monday through Friday, 8 am to 4 pm
Wali R, Khare S, Tretiakova M, Cohen G, Nguyen L, Hart J, Wang J, Wen M, Ramaswamy A, Joseph L, Sitrin M, Brasitus T,
Bissonnette M: “Ursodeoxycholic Acid and F6-D3 Inhibit Aberrant Crypt Proliferation in the Rat Azoxymethane Model of Colon
Cancer: Roles of Cyclin D1 and E-Cadherin.” Cancer Epidemiology, Biomarkers & Prevention. 2002;11(12):1653-1662.
Khare S, Cerda S, Wali RK, von Lintig FC, Tretiakova M, Joseph L, Stoiber D, Cohen G, Nimmagadda K, Hart J, Sitrin MD, Boss GR,
Bissonnette M: “Ursodeoxycholic Acid Inhibits Ras Mutations, Wild Type Ras Activation and Cyclooxygenase-2 Expression in Colon
Cancer.” Cancer Research. 2003;63(13):3517-3523.
Cerda SR, Mustafi R, Little H, Cohen G, Khare S, Moore C, Majumder P, Bissonnette M: “Protein kinase C delta inhibits Caco-2 cell
proliferation by selective changes in cell cycle and cell death regulators.” Oncogene. 2006;25:3123-38.
Cohen G, Mustafi R, Chumsangsri A, Little N, Nathanson J, Cerda S, Jagadeeswaran S, Dougherty U, Joseph L, Hart J, Yerian L,
Tretiakova M, Yuan W, Obara P, Khare S, Sinicrope F, Fichera A, Boss G, Carroll R, Bissonnette M: “Epidermal Growth Factor
Receptor Signaling is Up-Regulated in Human Colonic Aberrant Crypt Foci.” Cancer Research. 2006;66(11):5656-64.
Fichera A, Little N, Jagadeeswaran S, Dougherty U, Sehdev A, Mustafi R, Cerda S, Yuan W, Khare S, Tretiakova M, Gong C,
Tallerico M, Cohen G, Joseph L, Hart J, Turner JR, Bissonnette M: “Epidermal growth factor receptor signaling is required for
microadenoma formation in the mouse azoxymethane model of colonic carcinogenesis.” Cancer Research. 2007;67(2):827-35.
Khare S, Mustafi R, Cerda S, Yuan W, Jagadeeswaran S, Dougherty U, Tretiakova M, Samarel A, Cohen G, Wang J, Moore C, Wali
R, Holgren C, Joseph L, Fichera A, Chun Li Y, Bissonnette M: “Ursodeoxycholic acid suppresses Cox-2 expression in colon cancer
cells: roles of Ras, p38, and CCAAT/Enhancer-Binding Protein.” Nutrition and Cancer. 2008;60(3):389-400.
Lin CF, Cohen G: “Endoscopic repair of colonic perforation following polypectomy.” American Journal of Gastroenterology. 2009;104
Roth MP, Cohen G: “A quarter causing intermittent gastric outlet obstruction.” Gastrointestinal Endoscopy. 2012;75(1):189-190.
Pekow J, Dougherty U, Huang Y, Gometz E, Nathanson J, Cohen G, Levy S, Kocherginsky M, Venu N, Westerhoff M, Hart J,
Noffsinger AE, Hanauer SB, Hurst RD, Fichera A, Joseph LJ, Liu Q, Bissonnette M: “Gene Signature Distinguishes Patients with
Chronic Ulcerative Colitis Harboring Remote Neoplastic Lesions.” Inflammatory Bowel Diseases. 2013;19(3):461-70.
Cohen G: “An Unusual Cause of Hematochezia in an Elderly Man.” Gastroenterology. 2014;147(5):e6-e7.
Cohen G, Prasad M: “To Band or Not to Band…” Gastroenterology. 2015;148(2):300-301.
Lemmer A, Kia L, Cohen G: “A rare esophageal complication following autologous stem cell transplantation.” Gastroenterology.
Cohen G, Prasad M: “Campylobacter pouchitis mimicking the appearance of Crohn’s Disease.” Case Reports in Gastrointestinal
Medicine. 2016, Article ID 5254914, 3 pages, 2016.
Cohen G, Schenck R: "Cryptosporidium pouchitis." Clinical Gastroenterology and Hepatology. 2017;15:xxvii-xxviii.
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Greg S. Cohen, MD
201 E Huron St ● Galter 11-205 ● Chicago, IL 60611 ● phone 312-695-4452 ● fax 312-695-4453