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Middle East J Dig Dis. 2016 Oct;8(4):249-266.

Esophageal Cancer in Golestan Province, Iran: A Review of Genetic Susceptibility and Environmental Risk Factors.

Author information

1
Golestan Research Center of Gastroenterology and Hepatology, Golestan University of Medical Sciences, Gorgan, Iran.
2
Digestive Disease Research Center, Tehran University of Medical Sciences, Tehran, Iran ; The Tisch Cancer Institute and Institute for Transitional Epidemiology, Icahn School of Medicine at Mount Sinai, New York, NY, USA ; Surveillance and Health Services Research, American Cancer Society, Atlanta, GA, USA.
3
Health Care Management Department, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran.
4
Digestive Disease Research Center, Tehran University of Medical Sciences, Tehran, Iran.

Abstract

Esophageal squamous cell carcinoma (ESCC) is an aggressive tumor that is typically diagnosed only when the tumor has gained remarkable size, extended to peripheral tissues, and led to dysphagia. Five-year survival of advanced cancer is still very poor (19%), even with improved surgical techniques and adjuvant chemoradiation therapy. Therefore, early detection and prevention are the most important strategies to reduce the burden of ESCC. Our review will focus on the studies conducted in Golestan province, an area with a high prevalence of ESCC in northern Iran. We review three aspects of the research literature on ESCC: epidemiological features, environmental factors (including substance abuse, environmental contaminants, dietary factors, and human papillomavirus [HPV]), and molecular factors (including oncogenes, tumor suppressor genes, cell cycle regulatory proteins, and other relevant biomarkers). Epidemiological and experimental data suggest that some chemicals and lifestyle factors, including polycyclic aromatic hydrocarbons (PAHs), cigarette smoking, opium use, and hot tea drinking are associated with the development of ESCC in Golestan. HPV infects the esophageal epithelium, but so far, no firm evidence of its involvement in esophageal carcinogenesis has been provided. Some of these factors, notably hot tea drinking, may render the esophageal mucosa more susceptible to injury by other carcinogens. There are few studies at molecular level on ESCC in Golestan. Increasing awareness about the known risk factors of ESCC could potentially reduce the burden of ESCC in the region. Further studies on risk factors, identifying high risk populations, and early detection are needed.

KEYWORDS:

Environmental risk factors; Esophageal cancer; Genetically susceptibility; Golestan

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