Does Helicobacter pylori Protect against Eosinophilic Esophagitis in Children?
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1 Marshall University From the SelectedWorks of Deborah L Preston October, 2014 Does Helicobacter pylori Protect against Eosinophilic Esophagitis in Children? Yoram Elitsur, MD, Joan C Edwards School of Medicine, Marshall University Baraa Alabd Alrazzak, Joan C. Edwards School of Medicine, Marshall University Deborah L. Preston, Joan C. Edwards School of Medicine, Marshall University Yulia Demetieva, Emmanuel College - Boston Available at:
2 Does Helicobacter pylori Protect against Eosinophilic Esophagitis in Children? Yoram Elitsur,* Baraa Alabd Alrazzak,* Deborah Preston* and Yulia Demetieva Helicobacter ISSN doi: /hel *Gastroenterology Division, Department of Pediatrics, Marshall University School of Medicine, Huntington, WV, USA, Department of Mathematics, Emmanuel College, Boston, MA, USA Keywords Helicobacter pylori, eosinophilic esophagitis, children. Reprint requests to: Yoram Elitsur, Gastroenterology Division, Department of Pediatrics, Marshall University School of Medicine, 1600 Medical center drive, Huntington, WV 25701, USA. Summary Background: Helicobacter pylori infection and eosinophilic esophagitis (EoE) in children seem to have a reversed association with socioeconomic status (hygienic condition) and allergy conditions. While Hp infection (Hp) is highly associated with poor hygiene and/or poor socioeconomic status, but not with allergic conditions (asthma, rhinitis, etc.), EoE has the opposite epidemiological relationship (high association with allergy but low with low hygienic conditions). Aim: To investigate the association between Hp infection and EoE in children. Methods: A retrospective chart review of all children who undergo the first upper endoscopy procedure in the gastroenterology clinic, between 2007 and 2012, was performed. Demographic, endoscopic and histological data were collected. The data was divided into 4 diagnostic groups: Hp infection, EoE, reflux esophagitis, and children who had normal histology. The relationship between Hp positive children and the other groups was performed. Results: A total of 966 charts were available for review. Esophagitis, idiopathic gastritis, EoE, and Hp infection were detected in 268 (28%), 480 (49%), 62 (6%), and 31 (3%) children, respectively. The mean age of the EoE group was significantly lower compared to all reference groups (p <.002), but no significant different was detected among the reference groups (gastritis, GERD, and Hp infection; p = 1.00). Simple logistic regression analysis using Hp infection as a predictor for EoE did not find a significant relationship between these two variables (p-value =.471, OR = 0.478, 95% CI ). However, multivariable logistic regression analysis between EoE and the reference groups indicated a significant negative relationship between Hp infection and EoE (p-value =.023, adjusted OR = 0.096, 95%CI ). Neither gastritis nor GER showed significant relationship with EoE (p-values are and.992, respectively). Conclusion: A reversed association between Hp and EoE was found in a cohort of West Virginia children. The possible explanations for these findings are discussed. Helicobacter pylori infection in children has been well characterized, and treatment guidelines have been established [1]. Helicobacter pylori infection is associated with poor hygiene, low socioeconomic conditions, and family crowding [2]. Indeed, the rate of H. pylori infection in children from developing countries is higher compared with children living in developed countries [3]. On the contrary, an inverse association between the prevalence of H. pylori infection and allergic diseases was reported. For example, the prevalence of asthma, rhinitis, eczema, or other allergies was lower in H. pylori-infected compared with non-h. pylori-infected children [4 8]. Eosinophilic esophagitis (EoE) is a newly established chronic esophageal disease in adults and children with clinical and pathological characterizations [9]. Previous 2014 John Wiley & Sons Ltd, Helicobacter 1
3 H. pylori association with EoE in children Elitsur et al. studies have documented that the prevalence of EoE in children is increasing, especially in those who live in developed countries [9]. Clinical and laboratory experiments on animal models documented the close association between environmental allergies (asthma, rhinitis) and EoE. In fact, over three quarters of children diagnosed with EoE have associated food or environmental allergies, suggesting that those allergens are the trigger for the development of EoE in children [9]. Moreover, several clinical studies have documented that various protocols of food elimination diets resulted in clinical and histologic resolution of EoE [10 13]. The opposite role of environmental allergies in EoE and H. pylori infection has raised the possibility that both diseases may have an inverse burden in human disease, that is, one disease may protect the human from getting the other. Indeed, a recent report by Dellon et al. [14] showed an inverse association between esophageal eosinophilia and H. pylori infection in adult patients. In this report, the authors analyzed data collected from the US pathology database (>160, 000 patients) and reported a reduced rate of H. pylori infection in patients with EoE (defined as eos >15 eos/hpf) (OR 0.79; 95% CI: ). In another study, Furuta et al. compared the rate of H. pylori infection in adult patients with EoE and eosinophilic gastroenteritis (EGE) and normal control. The authors reported that the odds ratio of H. pylori infection in the tested groups compared with control was 0.22 and 0.31 in EoE and EGE, respectively [15]. Although the diagnosis of H. pylori infection was established by serology and not histology, it suggested a reversed relationship between H. pylori infection and the eosinophilic gastrointestinal disorders (EGIDs). To our knowledge, a similar study in children has not been published. In the present study, we evaluated the association between H. pylori infection and EoE disease in the children diagnosed and treated for EoE in our pediatric gastroenterology clinic, at Marshall University School of Medicine. Material and Methods A retrospective chart review of all children who underwent their first upper endoscopy procedure in the gastroenterology clinic, between 2007 and 2012, was performed. Demographic, endoscopic, and histologic data were collected. The data were then divided into four diagnostic groups: Children with H. pylori infection, children with EoE, children with reflux esophagitis, and children who had normal histology. The relationship between H. pylori-positive children and the other groups was performed. Endoscopic Procedure The endoscopic procedures were scheduled for various clinical indications. All endoscopic procedures were performed under general anesthesia given by an anesthesiologist or nurse anesthetist using propofol (iv), versed (iv), or inhalation of nitric oxide or sevoflurane gas. The mode of anesthesia was given as per the discretion of the anesthesiologist. All endoscopic procedures were performed by one experienced physician (YE), and biopsies were taken from all procedures irrespective of the mucosal appearance at the time of the procedures. The following number of biopsies was included in each endoscopic procedure: esophagus (distal 3; mid 3 when EoE was suspected); stomach (antrum 4 for histology, two for rapid urease test, body 2); two from the duodenal bulb, and two from the duodenum (second part). All biopsies were reviewed by our boardcertified pathological team according to established diagnostic standards. Helicobacter pylori organism was evaluated by H&E and Giemsa staining. When high number of eosinophils was suspected in the esophagus, a specific eosinophil count was performed. Helicobacter pylori was diagnosed when the organism was positive by histology and by positive rapid urease test (CLO test). EoE was established according to histologic guidelines for EoE diagnosis, that is, when esophageal eosinophil count was >15/HFP (at magnification 9400) in the distal and mid esophagus with low eosinophil counts in the gastric or duodenal mucosa. All EoE patients had failed adequate PPI therapy according to previously published guidelines [9]. Esophageal reflux was defined when eosinophil count was <15/HPF. Helicobacter pylori-associated gastritis was defined when H. pylori organism was found by positive histology and positive rapid urease test and mucosal inflammation. Gastritis was defined according to established histologic findings but with negative H. pylori organism on both tests (H&E and CLO test). Normal histology was defined where no histologic pathology identified in the esophagus, stomach, or duodenum was determined by the pathologist who reviewed the patient s biopsies. Statistical Analysis Statistical analyses were performed using IBM SPSS Statistics Software, version 21 (Armonk, NY, USA). Logistic regression analysis was used to determine the association between H. pylori infection as a predictor variable and EoE as a response variable. Multivariable logistic regression analysis included GER and idiopathic gastritis as covariates. Unadjusted and adjusted odds John Wiley & Sons Ltd, Helicobacter
4 Elitsur et al. H. pylori association with EoE in children ratios (OR) between EoE and H. pylori infection were computed. Results A total of 966 charts were available for review. The mean age and M : F ratio were 11.3 years and 1 : 1.18, respectively. Histologic diagnoses of esophagitis (GERD), idiopathic gastritis, EoE, and H. pylori-associated gastritis (H. pylori infection) were detected in 268 (28%) EGDs, 480 (49%) EGDs, 62 (6%) EGDs, and 31 (3%) EGDs, respectively [Table 1]. The male/female ratio for the different groups was 1.3 : 1.0, 0.9 : 1.0, 2.0 : 1.0, and 0.5 : 1.0 for GERD, Gastritis, EoE, and H. pylori infection, respectively [Table 1]. The mean age of the EoE group was significantly lower compared with all reference groups (p <.002, Mann Whitney test), but no significant difference was detected among the reference groups (gastritis, GERD, and H. pylori infection; p = 1.00) [Table 1]. The proportion of EoE-infected patients among H. pylori-infected patients was (or 3%), while the proportion of EoE-infected patients among patients without H. pylori infection was (or 6.5%). Simple logistic regression analysis using H. pylori infection as a predictor for EoE did not find a significant relationship between these two variables (pvalue =.471, OR = 0.478, 95% CI ). However, multivariable logistic regression analysis with H. pylori infection, gastritis, and GER as covariates indicated a negative significant relationship between H. pylori infection and EoE (p-value =.023, adjusted OR = 0.096, 95% CI ). Neither gastritis nor GER showed significant relationship with EoE (p-values are and.992, respectively). Discussion In the present study, we showed a significant reversed association between H. pylori and EoE under multivariable logistic regression analysis. The association between EoE and H. pylori infection has not been adequately investigated in the literature. Utilizing a large database, collected from biopsy results, Dellon et al. [14] reported a reversed association between H. pylori infection and esophageal eosinophilia. The relationship was stronger with higher number of eosinophils. In comparison with Dellon s study [14], our study cohort was smaller but included real patients who were diagnosed with EoE according to the clinical and histologic expert s guidelines [9]. Moreover, unlike in the cited study, all of our EoE patients failed anti-acid medication trials before the diagnosis of EoE was established. The possible association between EoE and H. pylori infection is intriguing and deserves further discussion. With the explosion of novel clinical information involving the human microbiome project, the hygienic theory becomes more plausible and acceptable by the medical scientific community. Epidemiological studies have supported the hygiene theory as an important factor in the etiology of several human diseases, such as IBD, autoimmune diseases, and H. pylori infection [1, 16 18]. The higher prevalence of H. pylori infection in the developing countries was attributed to the lower socioeconomic and hygienic conditions that exist in those countries [2]. Indeed, in the last several decades, the improvement of the socioeconomic conditions in the developed areas has directly impacted the rate of H. pylori infection [19 21]. Similarly, the hygienic theory was also applied to allergic conditions. Countries with low hygienic conditions and low socioeconomic conditions (overcrowding, low income, etc.) have higher infection rates and lower allergy-related diseases, such as asthma, eczema, allergic rhinitis, and others [4,5]. The association of EoE with allergies (environmental and/or food) is well documented, but its association with poor hygienic conditions has not been well established. It is interesting to note that most of the global Table 1 Incidents of eosinophilic esophagitis (EoE) disease, Hp infection, idiopathic gastritis, and GER in 966 children Hp infection GERD Gastritis Disease EoE Hp + Hp GERD + GERD Gastritis + Gastritis Total EoE EoE Total M/F ratio 0.5 : : : 1 Age (years) SD p >.05 EoE group p (Mann Whitney) John Wiley & Sons Ltd, Helicobacter 3
5 H. pylori association with EoE in children Elitsur et al. reports on EoE originated from the developed countries [9,22], but as the disease is more recognized by the health providers, reports on EoE disease in the developing countries are emerging [23,24]. On the other hand, in the US, the rate of EoE in rural areas was reported lower compared with the rate in the urban areas [25]. This datum suggests that air pollution (environmental allergens) may explain those differences rather than hygienic conditions [26]. In support of this hypothesis are the data published from WV. The state of WV is considered a rural state, known for its low-income and low socioeconomic population, and a state with low environmental pollution ( Considering this background, it is not surprising that the rate of H. pylori infection in the pediatric population was reported high, while the prevalence of EoE among those children was low [27]. In recent years, due to improved socioeconomic conditions, we observed a significant drop in H. pylori prevalence among our children [28]. This drop is reflected by our low number of H. pylori infections seen in this study. We acknowledge some limitations of our study, including the retrospective nature of the report that prevented us from controlling for possible confounding factors, that is, demographic and socioeconomic conditions, as well as the small number of patients diagnosed with H. pylori infection and/or EoE disease. The strength of the report is demonstrated by the fact that this is the first time that the relationship between EoE and H. pylori infection was evaluated in the pediatric population using data from existing patients that have been followed by the authors and do not consist of gathering data from the national pathological database [14]. With limited data available in children, it is clear that prospective studies are needed to shed further information on this topic. In conclusion, this is the first study to investigate the association between H. pylori infection and EoE disease in children. We showed that there is a significant reverse association between EoE disease and H. pylori infection. Additional, prospective studies in children are needed to further investigate this association. Acknowledgements and Disclosures Competing interests: The authors have no competinginterests. References 1 Koletzko S, Jones NL, Goodman K, et al. Evidence-based recommendations from ESPGHAN and NASPGHAN for Helicobacter pylori infection in children. J Pediatr Gastroenterol Nutr 2011;53: Bruce MG, Maaroos HI. Epidemiology of Helicobacter pylori infection. Helicobacter 2008;13: World gastroenterology organization. World gastroenterology organization global guideline: Helicobacter pylori in developing countries. J Clin Gastroenterol 2011;45: Chen Y, Blaser MJ. Inverse associations of Helicobacter pylori with asthma and allergy. Arch Intern Med 2007;167: Chen Y, Blaser MJ. Helicobacter pylori colonization is inversely associated with childhood asthma. J Infect Dis 2008;198: Reibman J, Marmor M, Filner J, et al. Asthma is inversely associated with Helicobacter pylori status in an urban population. PLoS One 2008;3:e Blaser MJ, Chen Y, Reibman J. Does Helicobacter pylori protect against asthma and allergy? Gut 2008;57: D Elios MM, Codolo G, Amedei A, et al. Helicobacter pylori, asthma and allergy. FEMS Immunol Med Microbiol 2009;56: Liacouras CA, Furuta GT, Hirano I, et al. Eosinophilic esophagitis: updated consensus recommendations for children and adults. J Allergy Clin Immunol 2011;128:3 20.e6. 10 Kagalwalla AF, Sentongo TA, Ritz S, et al. Effect of six-food elimination diet on clinical and histologic outcomes in eosinophilic esophagitis. Clin Gastroenterol Hepatol 2006;4: Kagalwalla AF, Shah A, Li BUK, et al. Identification of specific foods responsible for inflammation in children with eosinophilic esophagitis successfully treated with empiric elimination diet. J Pediatr Gastroenterol Nutr 2011;53: Spergel JM, Andrews T, Brown-Whitehorn TF, Beausoleil JL, Liacouras CA. Treatment of eosinophilic esophagitis with specific food elimination diet directed by a combination of skin prick and patch tests. Ann Allergy Asthma Immunol 2005;95: Kagalwalla AF, Amsden K, Shah A, Ritz S, Manuel-Rubio M, Dunne K, Nelson SP, Wershil BK, Melin-Aldana H. Cow s milk elimination: a novel dietary approach to treat eosinophilic esophagitis. J Pediatr Gastroenterol Nutr 2012;55: Dellon ES, Peery AF, Shaheen NJ, et al. Inverse association of esophageal eosinophilia with Helicobacter pylori based on analysis of a US pathology database. Gastroenterology 2011;141: Furuta K, Adachi K, Aimi M, et al. Case-control study of association of eosinophilic gastrointestinal disorders with Helicobacter pylori infection in Japan. J Clin Biochem Nutr 2013;53: Lakatos PL. Environmental factors affecting inflammatory bowel disease: have we made progress? Dig Dis 2009;27: Ben-Ami Shor D, Harel M, Eliakim R, Shoenfeld Y. The hygiene theory harnessing helminths and their ova to treat autoimmunity. Clin Rev Allergy Immunol 2013;17: Okada H, Kuhn C, Feillet H, Bach JF. The hygiene hypothesis for autoimmune and allergic diseases: an update. Clin Exp Immunol 2010;160: Janjetic MA, Cinthia G, Goldman CG, et al. Decreasing trend of Helicobacter pylori infection in children with gastrointestinal symptoms from Buenos Aires, Argentina. Helicobacter 2011;16: Tkachenko MA, Zhannat NZ, Erman LV, et al. Dramatic changes in the prevalence of Helicobacter pylori infection during childhood: a 10 years follow up study in Russia. J Pediatr Gastroenterol Nutr 2007;45: John Wiley & Sons Ltd, Helicobacter
6 Elitsur et al. H. pylori association with EoE in children 21 Oona M, Utt M, Nilsson I, et al. Helicobacter infection in children in Estonia: decreasing seroprevalence during the 11 period of profound socioeconomic changes. Helicobacter 2004;9: Elitsur Y. The confounding factors affect the pathophysiology of eosinophilic esophagitis. World J Gastroenterol 2012;18: Jung YM, Lee HS, Lee DH, et al. Clinical significance of incidentally detected eosinophilic esophagitis with pathologic review. Korean J Gastroenterol 2010;55: Shi YN, Sun SJ, Xiong LS, Cao QH, Cao QH, Cui Y, Chen MH. Prevalence, clinical manifestations and endoscopic features of eosinophilic esophagitis: a pathological review in China. J Dig Dis 2012;13: Spergel JM, Book WM, Mays E, Song L, Shah SS, Talley NJ, Bonis PA. Variation in prevalence, diagnostic criteria, and initial management options for eosinophilic gastrointestinal diseases in the United States. J Pediatr Gastroenterol Nutr 2011;52: Elitsur Y. Eosinophilic esophagitis Is it in the air? J Pediatr Gastroenterol Nutr 2002;34: Gill R, Durst P, Rewalt M, Elitsur Y. Eosinophilic esophagitis disease in children from West Virginia: a review of the last decade ( ). Am J Gastroenterol 2007;102: Elitsur Y, Dementieva Y, Rewalt M, Lawrence Z. Helicobacter pylori infection decrease in symptomatic children: a retrospective analysis of 13 years ( ) from a gastroenterology clinic in West Virginia. J Clin Gastroenterol 2009;43: John Wiley & Sons Ltd, Helicobacter 5
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