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      Reflux, Barrett's oesophagus and adenocarcinoma: burning questions.

      Nature reviews. Cancer
      Adenocarcinoma, etiology, pathology, physiopathology, prevention & control, Barrett Esophagus, DNA Damage, physiology, Endoscopy, Esophageal Neoplasms, Female, Gastroesophageal Reflux, complications, Humans, Male, Mass Screening, Precancerous Conditions, Risk Factors

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          Abstract

          The incidence of oesophageal adenocarcinoma is increasing rapidly in Western populations. Gastro-oesophageal reflux disease is a strong risk factor for both this tumour and the pre-cancerous lesion Barrett's oesophagus, but the underlying disease mechanisms remain unclear. Developing a better understanding of the aetiology and pathogenesis of Barrett's oesophagus, including the induction of DNA damage and genetic alterations, might provide opportunities for improved management of individuals with this disease. This could include a better rationale for screening and surveillance programmes, as well as targeted intervention strategies.

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          Changing patterns in the incidence of esophageal and gastric carcinoma in the United States.

          Incidence rates for esophageal adenocarcinoma previously were reported to be increasing rapidly, especially among white males. Rates for gastric cardia adenocarcinoma also were observed to be rising, although less rapidly. In this article, the authors update the incidence trends through 1994 and further consider the trends by age group. Surveillance, Epidemiology, and End Results (SEER) program data were used to calculate age-adjusted incidence rates for esophageal carcinoma by histologic type and gastric adenocarcinoma by anatomic subsite. Among white males, the incidence of adenocarcinoma of the esophagus rose > 350% since the mid-1970s, surpassing squamous cell carcinoma around 1990. Rates also rose among black males, but remained at much lower levels. To a lesser extent, there were continuing increases in gastric cardia adenocarcinoma among white and black males, which nearly equaled the rates for noncardia tumors of the stomach in white men. The upward trend for both tumors was much greater among older than younger men. Although the incidence also rose among females, rates remained much lower than among males. Previously reported increases of esophageal adenocarcinoma are continuing, most notably among white males. Cigarette smoking may contribute to the trend through an early stage carcinogenic effect, along with obesity, which may increase intraabdominal pressure and predispose to gastroesophageal reflux disease. Further research into esophageal and gastric cardia adenocarcinoma is needed to clarify the risk factors and mechanisms responsible for the upward trends as well as the racial and gender disparities in incidence.
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            Tobacco, alcohol, and socioeconomic status and adenocarcinomas of the esophagus and gastric cardia.

            Incidence rates for adenocarcinomas of the esophagus and gastric cardia have risen steeply over the last few decades. To determine risk factors for these tumors, we conducted a multicenter, population-based, case-control study. The study included 554 subjects newly diagnosed with esophageal or gastric cardia adenocarcinomas, 589 subjects newly diagnosed with esophageal squamous cell carcinoma or other gastric adenocarcinomas, and 695 control subjects. Estimates of risk (odds ratios [ORs] and corresponding 95% confidence intervals [CIs]) were calculated for the four tumor types separately and for esophageal and gastric cardia adenocarcinomas combined. Risk of esophageal and gastric cardia adenocarcinomas combined was increased among current cigarette smokers (OR = 2.4; 95% = 1.7-3.4), with little reduction observed until 30 years after smoking cessation; this risk rose with increasing intensity and duration of smoking. Risk of these tumors was not related to beer (OR = 0.8; 95% CI = 0.6-1.1) or liquor (OR = 1.1; 95% CI = 0.8-1.4) consumption, but it was reduced for drinking wine (OR = 0.6; 95% CI = 0.5-0.8). Similar ORs were obtained for the development of noncardia gastric adenocarcinomas in relation to tobacco and alcohol use, but higher ORs were obtained for the development of esophageal squamous cell carcinomas. For all four tumor types, risks were higher among those with low income or education. Smoking is a major risk factor for esophageal and gastric cardia adenocarcinomas, accounting for approximately 40% of cases. Because of the long lag time before risk of these tumors is reduced among ex-smokers, smoking may affect early stage carcinogenesis. The increase in smoking prevalence during the first two thirds of this century may be reflected in the rising incidence of these tumors in the past few decades among older individuals. The recent decrease in smoking may not yet have had an impact.
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              Trends in incidence of adenocarcinoma of the oesophagus and gastric cardia in ten European countries.

              In many western countries an increase in incidence of adenocarcinoma of the oesophagus and/or gastric cardia have been reported. The aim of this study was to describe and compare trends in incidence of adenocarcinoma of the oesophagus and gastric cardia in several areas of Europe, 1968-1995, using Eurocim (a database of cancer incidence and mortality data from 95 European cancer registries). Time-trends in age-standardized incidence rates of adenocarcinomas of the oesophagus and gastric cardia are described in 11 population-based cancer registries from 10 countries in North, South, East, West and Central Europe, 1968-1995. The statistical significance of the time-trends in incidence was assessed using Poisson regression analysis. An increase in incidence of adenocarcinomas of the oesophagus and gastric cardia was observed in Northern Europe (Denmark), Southern Europe (Italy, Varese), Eastern Europe (Slovakia) and Western Europe (England and Wales, Scotland). In Central Europe (Switzerland, Basel) and in the cancer registries of Iceland (Northern Europe), France, Bas-Rhin and Calvados, Southern Ireland, and the Netherlands, Eindhoven (Western Europe) no rise in incidence was observed. The increase in incidence of adenocarcinomas of the oesophagus and gastric cardia was accompanied by a decrease in incidence of both adenocarcinomas and non-adenocarcinomas of the non-cardia part of the stomach in almost all of the 11 cancer registries studied. Increased histological verification of tumours of the oesophagus and stomach and improvement in precision of histological diagnosis may partly explain the increase in incidence of adenocarcinomas in some registries. This study, using Eurocim data, supports the findings from other time-trend studies of population-based cancer registries in western countries.
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