Hiroshi Mashimo MD MS, PhD

Advanced Endoscopic Interventional, Esophagus Disease, Gastrointestinal Functional & Motility Disorders

VA Boston Healthcare/Harvard Medical School Brigham and Women's Hospital

1400 VFW ParkwayRES 151 BDDG 3 Rm 2B102West Roxbury, MA 02132
Phone+1 857-203-5640
Fax+1 857-203-5666

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Summary

Dr. Hiroshi Mashimo is a gastroenterologist based in West Roxbury, MA, specializing in advanced endoscopic interventions, esophagus diseases, and gastrointestinal functional and motility disorders. He completed his fellowship and residency in gastroenterology and internal medicine at Massachusetts General Hospital after earning his medical degree from Albert Einstein College of Medicine. Alongside his clinical role at the Veterans Affairs Boston Healthcare System, he is an Associate Professor at Harvard Medical School and holds adjunct and lecturing positions at Boston University School of Medicine and MIT, respectively. Dr. Mashimo has contributed to various clinical trials, primarily focusing on diabetic gastroparesis, and has published research in reputable journals. His work has earned him several honors, including the VA Innovation Award and the Young Investigator Award from the American Motility Society.

Education & Training

Mass General Brigham/Massachusetts General HospitalFellowship, Gastroenterology, 1991 - 1995
Mass General Brigham/Massachusetts General HospitalResidency, Internal Medicine, 1988 - 1991
Albert Einstein College of MedicineClass of 1988
Albert Einstein College of MedicinePh.D., Microbiology and Immunology, 1988
Yeshiva UniversityM.S., Biomedical Sciences, 1985

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Certifications & Licensure

MA State Medical License 1988 - 2027
National Board of Physicians and Surgeons Gastroenterology
National Board of Physicians and Surgeons Internal Medicine

Awards, Honors, & Recognition

VA Innovation Award Veterans Administration, 2017-2018
Distinguished Lecture Award Little Brain Big Brain Society, 2007
Young Investigator Award American Motility Society, 1996

Clinical Trials

Effect of Tegaserod on Gastric Emptying in Patients With Diabetic Gastroparesis
TERMINATED
PHASE4
A Randomized Trial of Medical and Surgical Treatments for Patients With GERD Symptoms That Are Refractory to Proton Pump Inhibitors Start of enrollment: 2012 Aug 13
COMPLETED
PHASE3
Safety and Efficacy of Relamorelin Administered to Participants With Vomiting Symptoms and Moderate to Severe Diabetic Gastroparesis Start of enrollment: 2015 Jan 29
COMPLETED
PHASE2

Publications & Presentations

PubMed

1 citations
Characterization and Management of Benign Esophageal Strictures.
Varun Teja Angajala, Danielle Bellavance, Justin Lee, Hiroshi Mashimo
Annals of the New York Academy of Sciences. 2026-02-01
Antireflux Surgery for Barrett's Esophagus: Where Do We Stand in Preventing Esophageal Adenocarcinoma?
Dagmar Kollmann, Cansel Etyemez, Reza Asari, Gerd Jomrich, George Triadafilopoulos
Annals of the New York Academy of Sciences. 2026-02-01
1 citations
Retroflexion in the Stomach During Endoscopy: Importance of the Examination and Its Utility.
Kevin Huang, Hiroshi Mashimo
Annals of the New York Academy of Sciences. 2025-12-01

Journal Articles

Personal Reflections on Covid-19
Mashimo, H., DigBoston, 4/15/2020
Critical assessment of endoscopic techniques for gastroesophageal reflux disease
with Lo, W.-K., J. Clin, Gastroenterol., 1/1/2015
Treatment of chronic radiation proctopathy with radiofrequency ablation (with video)
Rustagi, T., Corbett, F.S., Gastrointest Endosc, 1/1/2015

Books/Book Chapters

Textbook of Internal Medicine--An Intensive Board Review with 1000 MCQs
Chapter: Chapter 2: Disorders of the Esophagus
Page 3 - 14with Rustagi, T.Editors: Baliga RR.Blendon-Miller2015
Current Diagnosis and Treatment in Gastroenterology, Hepatology and Endoscopy
Chapter: Chapter 13: Oropharyngeal and Esophageal Motility Disorders
Page 155 - 171Goyal, R.K., Chaudhury, A.Editors: Greenberger, N. J..Lange Publishing Co., New York2008
Translational Multimodality Optical Imaging
Chapter: Endoscopy
Chen, Y., Aguirre, A.D., Adler, D., Fujimoto, J.G.Editors: Intes, F., Azar.Artech House2008

Lectures

Approach to Evaluating and Managing Fecal Incontinence
1/1/2015
Advanced Endoscopic Imaging: Beyond White Light
VABHS, Boston, MA - 1/1/2015
Potential for Engineered Cell-Based Therapies in the Gut
VABHS, Boston, MA - 1/1/2015

Other

Should you get endoscopy if you have heartburn?
Mashimo, H., Boston Globe Newspaper
1/1/2006
Conservation and diversity in the murine major histocompatibility complex: studies on the T3 subset of the TLA genes
Mashimo, H., Albert Einstein College of Medicine, Yeshiva University thesis dissertation
1/1/1988
Characterization of novel Class I Major Histocompatibility-like proteins associated with thymus leukemia
Mashimo, H., Biochemical Sciences Dept., Harvard College, Harvard University undergraduate thesis dissertation
1/1/1981

Authored Content

Physiology of Esophageal MotilityMay 2006

Press Mentions

Mauna Kea Technologies Announces Strong Presence of Cellvizio at the OESO 14August 31st, 2017

Grant Support

Stem Cells For Novel Gene Delivery Of Nitric Oxide In The GutVeterans Affairs2011–2012
NO And VIP In Gastric Motility Using Knockout MiceNational Institute Of Diabetes And Digestive And Kidney Diseases1996–1999