Gastroenterology Associates of Tidewater

Center Information

Jo-Anne E. Tiamzon, BS, CCRC
Clinical Research Coordinator
MariCarmen Korngiebel-Rosique,, MS CCRC
Clinical Research Coordinator
Gastroenterology Associates of Tidewater
112 Gainsborough Square, Suite 200
Chesapeake, VA 23320
757-842-6009 (Research line)

Currently Enrolling Trials

[Show More]

Therapeutic Areas

Hepatology (Liver, Pancreatic, Gall Bladder)


Gastroenterology Associates of Tidewater is a 100% gastroenterology practice with three locations and six physicians. Our physicians are board-certified in Internal Medicine and Gastroenterology and have been participating in clinical research since 1995.

Our Investigators are known for their high caliber work, research experience, community reputations, and significant patient databases which ensure timely and easily met enrollment goals and successfully completed clinical trials.

Our clinical trials are conducted in our Chesapeake location which is conveniently located within 20 minutes of Norfolk International Airport.


Gastroenterology Associates of Tidewater has been involved with pharmaceutical research since 1995. We have participated in Phase II through Phase IV trials. We have successfully enrolled and completed over 100 trials.

Some indications of clinical trials that we have participated in are:

  • Gastroesophageal Reflux Disease (GERD)
  • Hepatitis C
  • Colonoscopy Preparation
  • Irritable Bowel Syndrome (IBS)
  • Crohn's Disease
  • Ulcerative Colitis
  • Dyspepsia
  • Functional Diarrhea
  • Chronic Constipation
  • Diverticulitis
  • Iron Deficiency Anemia
  • Anal Fissure
  • Peptic and Gastric Ulcers
  • Camera Pill for colon evaluation
  • Colon Cancer Biomarker
  • Gastroparesis (Idiopathic and Diabetic)
  • Fecal Calprotectin
  • Stool sample collection
  • Questionnaire/Survey/Interview - Hep C, IBD
  • Registry - IBD

Sponsors that we have worked with includes, but not limited to:
GlaxoSmithKline, Novartis, Tap Pharmaceuticals, Salix, Procter and Gamble, Berlex, Schering Plough, Pfizer, Hoffman LaRoche, Fleet Laboratories, Solvay, Elan Pharmaceuticals , AGI Pharmaceuticals, Alizyme, Hutchison Pharmaceuticals, Epigenomics Laboratories, Otsuka, Inkine, Trine, Centocor, Abbott, Eisai, Luitpold, Tioga Pharmaceuticals, Given Imaging, Janssen, Ferring, Ventrus Bioscience, PLx Pharma, Genentech, Santarus, Alere, Furiex, Sanofi-Aventis, Ironwood, Forest, Applied Proteomics, Prometheus Laboratories, Abbvie, Takeda, Receptos, PAION, Gilead, Theravance, Rhythm, Exact Sciences, BUHLMANN Laboratories, IM HealthScience, LLC ,Medtronic , Celgene Corporation, Pharmacosmos A/S, and DiaSorin Inc.

Some Clinical Research Organizations that we have worked with are:
ICON Clinical Research, Quintiles, PPD, PRA, Clinipace, ExecuPharm, Paragon, Synteract, Parexel, RTI Health Decisions, Research Pharmaceutical Services, Inc., INC Research, Clinical Management, Covance, Advanced Clinical, i3, United Biosource Corporation, Health Decisions and Phamanet.


Gastroenterology Associates of Tidewater is a private practice outpatient facility.

We have an endoscopy unit that is accredited through AAAHC, where we can perform colonoscopies, esophagogastroduodenoscopies, flexible sigmoidoscopies, M2A endoscopy, pill cam as well as Remicade and Entyvio infusions.

We have a fully staffed research department including a laboratory and lab processing area. We also have a dedicated office for monitors, an ECG machine, a -20 °c freezer that is temperature controlled, a double-locked drug storage area that is temperature controlled and temperature-controlled refrigerated drug storage. All equipment is calibrated yearly and calibration documents are available upon request.


Our Principal Investigators are:

Felix P. Tiongco, MD and Shoba P. Mendu, MD

Dr. Tiongco has been a Principal Investigator since 2014. Prior to becoming a Principal Investigator he served as a Sub-investigator for 16 years.

Dr. Mendu has been a principal investigator since 2014. Prior to becoming a Principal Investigator she served as a Sub-investigator for 16 years.

Our Sub-Investigators are:

Alan Gamsey MD
Steven Dandalides MD
Walid Makdisi, MD
Brian Sullivan, MD
Shoba Mendu, MD
Jeremy Domanski, MD
Rene Rivera, MD
Elisa Carter, MPA-C


We have three full time research coordinators currently employed in our office, all certified through the CITI Good Clinical Practice Curriculum and have IATA certification. The 2 senior coordinators are also certified thru the Association Clinical Research Professionals:

Crystal M. Beaber, MAA, CCRC, a research coordinator, has over 13 years of clinical research experience.

Jo-Anne Tiamzon, BS, CCRC, a research coordinator, has over 15 years of clinical research experience.

MariCarmen Korngiebel-Rosique, MS, CRC, a research coordinator and recruiter, has 2 years of clinical research experience.


The physicians of Gastroenterology Associates of Tidewater draw referrals from the Hampton Roads/Tidewater area. This population base of greater than 2 million includes Norfolk, Virginia Beach, Chesapeake, Portsmouth, Suffolk, Hampton and Newport News.

Patients are also referred to our offices from as far away as Northeastern North Carolina, as well as the Outer Banks of North Carolina and the Eastern Shore of Virginia.


Our site takes pride in meeting enrollment expectations and high quality eCRF completion with limited queries.

Our site can use a central IRB for outpatient studies.

Contact Center

If you are interested in contacting this center to discuss clinical trials, please complete and send the email form below. A representative from the research center will then follow up with you.