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Abstract
Background & AimsIn the province of Cadiz (Spain), the adjusted mortality rate for gastric cancer in the coastal town of Barbate is 10/100.000 inhabitants, whereas in the inland town of Ubrique, the rate is twice as high. The rate of Helicobacter pylori (H. pylori) infection (H. pylori antibodies) in the normal population was 54% in Ubrique, but only 32% in Barbate. In the two decades since its original discovery, p53 has found a singularly prominent place in our understanding of human gastric cancer and H. pylori cause accumulation of reactive oxygen species in the mucosa compartment. This study was designed to compare serum levels of p53 in a population characterized by high mortality due to stomach cancer and a high prevalence of H. pylori infection and another population in which mortality from this cause and the prevalence of H. pylori infection are low.Materials and methods319 subjects from the low mortality population and 308 from the high mortality population were studied, as were 71 patients with stomach cancer. We measured serum immunoglobulin G antibody to H. pylori and serum mutant p53 protein and ceruloplasmin.ResultsThe difference between the two populations in the prevalence of H. pylori infection was significant (p < 0.001). Of the seropositive, 81% had elevated values of mutant p53, in comparison with 11% of the seronegative (p < 0.0001). Serum concentration of ceruloplasmin was significantly higher in seropositive with elevated mutant p53 protein than in seronegative with normal levels of p53 (p < 0.05).ConclusionsThere is a significant association between infection with H. pylori, elevated titers of H. pylori antibodies, and positivity for serum mutant p53 protein. Such information can significantly increase our basic knowledge in molecular pathology of gastric cancer and protection against H. pylori infection.
Highlights
Mortality due to gastric cancer in Spain has decreased markedly since the period from 1960 to 1965, but remains high in some mountain locations [1]
Such information can significantly increase our basic knowledge in molecular pathology of gastric cancer and protection against H. pylori infection
If H. pylori infection is related with cancer, the null hypothesis was that any variation or difference in seropositivity for the bacterium between the populations with high and low mortality rates due to gastric cancer is due to chance
Summary
Mortality due to gastric cancer in Spain has decreased markedly since the period from 1960 to 1965, but remains high in some mountain locations [1]. In the southern Atlantic province of Cadiz, coastal towns such as Barbate have an adjusted mortality rate of 10/100.000 inhabitants, whereas towns such as Ubrique, located in the mountainous region 30 kilometers inland, have an adjusted mortality rate of 20/100.000 [2]. An earlier study found that the rate of Helicobacter pylori infection (determined by measuring serum H. pylori IgG antibodies) in the normal population was 54% in Ubrique, but only 32% in Barbate, where the mortality rate for stomach cancer is lower. In the province of Cadiz (Spain), the adjusted mortality rate for gastric cancer in the coastal town of Barbate is 10/100.000 inhabitants, whereas in the inland town of Ubrique, the rate is twice as high. This study was designed to compare serum levels of p53 in a population characterized by high mortality due to stomach cancer and a high prevalence of H. pylori infection and another population in which mortality from this cause and the prevalence of H. pylori infection are low
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