We updated the design of this site on December 18, 2017. Learn more.
ClinicalTrials.gov Menu

Stomach and Esophageal Cancers in Northern Iran

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details.
ClinicalTrials.gov Identifier: NCT00339742
Recruitment Status : Completed
First Posted : June 21, 2006
Last Update Posted : October 19, 2017
Information provided by (Responsible Party):

Study Description
Brief Summary:

This study, sponsored jointly by the National Cancer Institute and the Tehran University of Medical Sciences, will explore the causes of cancers of the stomach and esophagus (the tube that runs between the mouth and the stomach) in Northern Iran. This is a unique area of study for the following reasons:

  • Some of the highest rates of esophageal cancer in the world have been reported in northeastern Iran 109 cases per 100,000 men and 175 cases per 100,000 women each year about 40 times higher than the rates of this cancer in the United States.
  • In this area of Iran, unlike most areas of the world, the disease affects more women than men.
  • Within 300 miles along the southern border of the Caspian Sea, the rates fall to 10 cases per 100,000 people per year.

The high rates of disease in this area, the unique geographic distribution of cases, and the exceptionally high rate in women make Northern Iran a promising site for studying esophageal and stomach cancers.

Patients 30 years of age and older who are referred to the upper gastrointestinal disease Atrak Clinic in Gonbad, Golestan Province, Iran, with suspected esophageal cancer may be eligible for this study. In addition, control subjects 30 years of age and older with certain specified diseases will be recruited from patients referred to four hospitals in Gonbad and to the Taleghani Clinic. After giving informed consent, all participants will undergo the following procedures:

  • Interviews, including questions about age, ethnicity, education, and other demographic data; habits, such as tobacco, opium, and alcohol consumption; personal and family medical history; diet, with special attention to food preservation, cooking methods, and drinking water; physical activity; occupational and residential history; body measurements; signs and symptoms of upper gastrointestinal disease; oral hygiene; animal contact; transfusion history; and family socioeconomic status.
  • Blood draw (15 milliliters, or 1 tablespoon) for genetic and chemical testing for markers that may predict who gets the disease.
  • Hair and nail sampling to identify minerals or compounds whose exposure may be related to esophageal cancer.
  • Endoscopy to evaluate the health of the esophagus and stomach. This test will be performed on all case patients and on control participants who give their permission. Before the examination, the subject will swallow a liquid that numbs the throat and may be given a medicine through a vein to promote drowsiness. The subject will then swallow a tube (endoscope) through which the doctor can look at the esophagus and stomach and take samples of tissue to look for disease. The tissue samples will be examined microscopically and will then be stored for possible future genetic or other testing related to diagnosing or determining the risk of esophageal cancer.

Condition or disease
Esophageal Cancer

Detailed Description:

This case-control study (the first phase of the GEMINI project) is primarily focused on exploring the etiology (etiologies) of squamous cell carcinoma of the esophagus in northern Iran.

Esophageal and gastric cancers, together, are responsible for more than 1,000,000 annual deaths in the world. In 1996, cancers of the stomach and esophagus ranked first and second respectively, among the most frequent cancers in Iran, excluding skin cancers. Some of the highest incidence rates for esophageal cancer in the world have been reported in Northeastern Iran, in Northern Gonbad, with Age Standardized Rates (ASR) of 109/100,000 in men and 175/100,000 in women (1). These rates are approximately 40 times higher than those seen in the US. In this area, unlike most areas of the world, the incidence is higher in women than in men. Additionally, within 300 miles along the southern border of Caspian Sea, the rates fall to 10/100,000. The highest rates of EC in the world, a unique geographical distribution of cases, and an exceptionally high rate among women all make Northern Iran a very intriguing site for studying this disease.

An upper-GI referral clinic (Atrak Clinic) has already been established in Gonbad, Golestan Province, and DDRC researchers have conducted feasibility studies in this clinic. For the case-control study, local internists and other health system workers will refer suspected cases of esophageal cancer to the Clinic. All such patients will undergo endoscopy and biopsy for ascertainment of diagnosis. Patients who have histologically confirmed esophageal squamous cell carcinoma of the esophagus and consent to join the study will be enrolled as cases. There will be two control groups in this study, one selected from the neighborhood of case subjects and one from the patients referred to Atrak Clinic who do not have cancer. The neighborhood control group will serve as the primary control group. Both the cases and the controls will be interviewed and undergo collection of biological specimens including blood, hair and nails. Free (and optional) endoscopy will also be offered to the neighborhood controls. A four-year accrual of 300 cases, 600 neighborhood controls and 300 clinic controls is expected.

Environmental risk factors (including life-style, habits, and nutritional status) will be assessed through questionnaires and objective measurements in biological specimens. The role of genetic polymorphisms will be studies using genomic DNA from cases and controls. A subset of samples collected from cases and controls will be used to evaluate gene expression patterns, using microarray analysis, differences in serum protein patterns, using SELDI analysis.

Study Design

Study Type : Observational
Estimated Enrollment : 1200 participants
Observational Model: Case-Control
Time Perspective: Retrospective
Official Title: Gastric and Esophageal Malignancies in Northern Iran (GEMINI): Phase I: Case-Control Study
Study Start Date : March 25, 2003

Resource links provided by the National Library of Medicine

U.S. FDA Resources

Groups and Cohorts

Outcome Measures

Primary Outcome Measures :
  1. Esophageal Cancer [ Time Frame: At diagnosis ]

Eligibility Criteria

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

Ages Eligible for Study:   18 Years to 99 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No


Cases will be recruited and studied in Atrak Clinic, in Gonbad City.

All patients referred to Atrak Clinic suspected to have EC.

Patients 30 years of age or above from Gonbad, Minodasht, Kalaleh, Ramyan, Azad-Shahr, Maraveh-Tappeh, and the surrounding villages who have a histopathological diagnosis confirming ESCC and who consent to join the study will be enrolled as cases.


Controls will be recruited into one of the four hospitals of the city (Shohada, Motahary, Khatam, and Borzouieh), and in major referral outpatient clinic (Taleghani Clinic).

Controls will be selected from the patient 30 years of age or above who are referred to the four hospitals of the city and Taleghani Clinic.

Only patients referred for certain diseases will be selected as controls.



No association with tobacco or alcohol consumption, which are the main known risk factors for esophageal cancer (such as lung cancer, cardiovascular disease.

Not causing major changes in diet or life-style for a long time (such as major GI diseases, chronic malignancies, diabetes).

Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00339742

Iran, Islamic Republic of
Digestive Disease Research Center, Tehran University of Medical Sciences
Tehran, Iran, Islamic Republic of, 14117
Sponsors and Collaborators
National Cancer Institute (NCI)
Principal Investigator: Christian Abnet, Ph.D. National Cancer Institute (NCI)
More Information

Responsible Party: National Cancer Institute (NCI)
ClinicalTrials.gov Identifier: NCT00339742     History of Changes
Obsolete Identifiers: NCT00544843, NCT01338207
Other Study ID Numbers: 999903146
First Posted: June 21, 2006    Key Record Dates
Last Update Posted: October 19, 2017
Last Verified: February 14, 2017

Keywords provided by National Institutes of Health Clinical Center (CC) ( National Cancer Institute (NCI) ):
Esophageal Cancer
Case-Control Study
Environmental Risk Factors
Genetic Risk Factors

Additional relevant MeSH terms:
Esophageal Neoplasms
Gastrointestinal Neoplasms
Digestive System Neoplasms
Neoplasms by Site
Head and Neck Neoplasms
Digestive System Diseases
Esophageal Diseases
Gastrointestinal Diseases