Phenotypic manifestations of inflammatory bowel disease differ between Hispanics and non-Hispanic whites: results of a large cohort study

Early Life and Childhood Environmental Exposures, More Than Genetic Predisposition, Influence Age of Diagnosis in a Diverse Cohort of 2952 Patients With IBD

BACKGROUND AND AIMS

Inflammatory bowel disease (IBD) develops from a combination of genetic and environmental factors. The aim of this study was to determine the contribution of established environmental risk factors and genetic risk on age of IBD diagnosis in a diverse cohort.

METHODS

IBD patients in clinic completed detailed questionnaires. Blood was drawn for genetic analysis. Environmental risk factors and age of diagnosis were analyzed by ethnicity (Hispanic/Latinx or non-Hispanic White [NHW] individuals) and IBD subtype (ulcerative colitis or Crohn's disease [CD]). Weighted genetic risk scores and environmental risk scores were developed. We examined the relationship between environmental risk scores, genetic risk scores, and age of diagnosis.

RESULTS

A total of 2952 patients were included: 58.9% had CD. A total of 46.83% were of Hispanic background. Early life exposures like cesarean delivery and being born in a developed country were associated with a younger age of IBD diagnosis. Childhood exposures such as frequent plastic water bottle use and having more than 1 bathroom at home were associated with a younger age of IBD. Hispanic and NHW individuals shared similar susceptibilities to environmental exposures. Environmental factors explained 21% of the variance in age of CD diagnosis and 39% in ulcerative colitis. In models incorporating genetic risk score and environmental risk score, the environment was the only significant factor associated with younger age of IBD diagnosis in all groups.

CONCLUSIONS

Early life and childhood exposures impact IBD diagnosis and influence Hispanic and NHW individuals similarly. A cumulative environmental risk score contributes more to age of IBD diagnosis than genetic risk.

Epidemiologic profile of inflammatory bowel disease in Eastern Mediterranean Region (EMRO) countries: a systematic review and meta-analysis

BACKGROUND

Inflammatory bowel disease (IBD) consists of two main types: Crohn's disease (CD) and ulcerative colitis (UC). The epidemiology of IBD patients has not been comprehensively studied in EMRO countries; therefore, we conducted this meta-analysis to study the epidemiology of this disease in these countries.

METHODS

We searched four international databases, namely Scopus, Web of Knowledge (ISI), Medline/PubMed, and ProQuest, from inception up to the end of May 2023. The Preferred Reporting Items for Systematic Review and Meta-analysis (PRISMA) guideline was used to carry out this systematic review and meta-analysis investigation. Using the Joanna Briggs Institute (JBI) Critical Appraisal Checklist, the quality of the selected papers was assessed.

RESULTS

Based on the results of this study, the incidence of UC in EMRO countries was 2.65 per 100,000 (95% CI: 1.39-3.90), and the incidence of CD was 1.16 per 100,000 (95% CI: 0.73-1.59). The most commonly involved intestinal segment in CD was the terminal ileum (44.7%, 95% CI: 34.7-55.2), followed by the ileum (29.8%, 95% CI: 22.2-38.6), and colon (18.7%, 95% CI: 10.8-30.4). However, in UC patients, extensive colitis was the most common finding (32.3%, 95% CI: 26.4-38.8), followed by proctosigmoiditis (27.9%, 95% CI: 21.1-35.8), left-sided colitis (27.4%, 95% CI: 22.7-32.7), and proctitis (22.6%, 95% CI: 17.5-28.5).

CONCLUSION

As a result, we were able to establish the traits of IBD patients in EMRO nations. UC patients had a higher incidence than CD patients. The most common regions of involvement in CD and UC patients, respectively, were the colon and pancolitis. Compared to UC patients, CD patients had a higher history of appendectomy.

Burden of Crohn's Disease in the United States Medicaid Population, 2010-2019

BACKGROUND & AIMS

Twenty-five percent of the United States population is enrolled in Medicaid. Rates of Crohn's disease (CD) have not been estimated in the Medicaid population since the Affordable Care Act expansion in 2014. We aimed to estimate the incidence and prevalence of CD by age, sex, and race.

METHODS

We identified all 2010-2019 Medicaid CD encounters using codes from the International Classification of Diseases, Clinical Modification versions 9 and 10. Individuals with ≥2 CD encounters were included. Sensitivity analyses were performed on other definitions (eg, ≥1 CD encounter). Incidence required ≥1 year of Medicaid eligibility prior to first CD encounter date (2013-2019). We calculated CD prevalence and incidence using the entire Medicaid population as the denominator. Rates were stratified by calendar year, age, sex, and race. Poisson regression models examined CD-associated demographic characteristics. We compared demographics and treatments of the entire Medicaid population with the multiple CD case definitions using percent and median.

RESULTS

A total of 197,553 beneficiaries had ≥2 CD encounters. The CD point prevalence per 100,000 persons rose from 56 (2010) to 88 (2011) to 165 (2019). CD incidence per 100,000 person-years was 18 (2013) and 13 (2019). Higher incidence and prevalence rates correlated with female, white, or multiracial beneficiaries. Prevalence rates rose in later years. Incidence decreased over time.

CONCLUSIONS

From 2010 to 2019, Medicaid population CD prevalence increased while incidence decreased from 2013 to 2019. Overall Medicaid CD incidence and prevalence ranges align with prior large administrative database studies.

HOSPITALIZATION, USE OF BIOLOGICS AND SURGERY RATES IN INFLAMMATORY BOWEL DISEASES: A SINGLE-CENTRE COMPARATIVE ANALYSIS BETWEEN PUBLIC AND PRIVATE HEALTHCARE SYSTEMS IN A TERTIARY UNIT FROM LATIN AMERICA

BACKGROUND

Inflammatory bowel diseases (IBD) have rising incidence and prevalence rates globally. In IBD, there are scarce stu-dies comparing differences between patients according to socioeconomic status. Our aim was to comparatively evaluate hospitalizations, use of biologics and rates of surgery in patients with IBD between public and private healthcare systems.

METHODS

Single-center retrospective cohort study in patients with IBD from a tertiary referral unit from Latin America, between 2015 and 2021. CD and UC patients were classified into two subgroups: public and private systems. Demographic characteristics, hospitalizations, need for surgery and biologics were compared.

RESULTS

A total of 500 patients were included, 322 with CD and 178 with UC. CD-related hospitalizations were frequently observed in both healthcare systems (76.28% in private and 67.46% in public). More than half of the patients had been submitted to one or more CD-related abdominal surgery, with no significant difference between the subgroups. Although there was no difference in the rates of use of biological therapy in CD subgroups, infliximab was more used in the public setting (57.69% vs 43.97%). There was no difference in UC-related hospitalizations between the subgroups (public 30.69% and private 37.66%) as well as the rates of colectomy (public: 16.83%, private: 19.48%). Biologics were prescribed almost twice as often in private as compared to public (45.45 vs 22.77%).

CONCLUSION

There were no differences in the rates of hospitalization and abdominal surgery between the systems. In patients with UC, there was greater use of biological therapy in the private healthcare setting.

BACKGROUND

• In a tertiary IBD center in Latin America.

BACKGROUND

• More than half of the patients had been submitted to one or more CD-related abdominal surgical procedure.

BACKGROUND

• Between the two healthcare systems, there was no difference in the rates of use of biological therapy in patients with CD, and in UC-related hospitalizations.

BACKGROUND

• Biologics were prescribed almost twice as often in the private system as compared to the public in patients with UC.

Significant Racial and Ethnic Disparities Exist in Health Care Utilization in Inflammatory Bowel Disease: A Systematic Review and Meta-analysis

BACKGROUND

The incidence of inflammatory bowel disease (IBD) is rising worldwide, though the differences in health care utilization among different races and ethnicities remains uncertain. We aimed to better define this through a systematic review and meta-analysis.

METHODS

We explored the impact of race or ethnicity on the likelihood of needing an IBD-related surgery, hospitalization, and emergency department visit. Pooled odds ratios (ORs) with 95% confidence intervals (CIs) were calculated with I2 values reporting heterogeneity. Differences in IBD phenotype and treatment between racial and ethnic groups of IBD were reported.

RESULTS

Fifty-eight studies were included. Compared with White patients, Black patients were less likely to undergo a Crohn's disease (CD; OR, 0.69; 95% CI, 0.50-0.95; I2 = 68.0%) or ulcerative colitis (OR, 0.58; 95% CI, 0.40-0.83; I2 = 85.0%) surgery, more likely to have an IBD-hospitalization (OR, 1.54; 95% CI, 1.06-2.24; I2 = 77.0%), and more likely to visit the emergency department (OR, 1.74; 95% CI, 1.32-2.30; I2 = 0%). There were no significant differences in disease behavior or biologic exposure between Black and White patients. Hispanic patients were less likely to undergo a CD surgery (OR, 0.57; 95% CI, 0.48-0.68; I2 = 0%) but more likely to be hospitalized (OR, 1.38; 95% CI, 1.01-1.88; I2 = 37.0%) compared with White patients. There were no differences in health care utilization between White and Asian or South Asian patients with IBD.

CONCLUSIONS

There remain significant differences in health care utilization among races and ethnicities in IBD. Future research is required to determine factors behind these differences to achieve equitable care for persons living with IBD.

Racial Disparities in Infliximab Efficacy for Ulcerative Colitis: Evidence Synthesis and Effect Modification Assessment

An increasing amount of research explores the role of race in clinical phenotypes and outcomes in ulcerative colitis (UC). We aimed to investigate racial differences in infliximab (IFX) treatment efficacy in UC. We used aggregate data from IFX trials and evidence synthesis methods to generate race-specific efficacy estimates. Then, we tested the effect modification by race by comparing the race-specific estimates derived from independent evidence syntheses. We computed ratios of relative risks (RRRs) and performed tests of statistical interaction. We analyzed data from five randomized, placebo-controlled trials evaluating IFX as induction and maintenance therapy for adults with moderate-to-severe UC (875 participants; 45% Asians). We found no substantial evidence of racial differences concerning the efficacy of IFX in inducing clinical response (RRR = 0.89, 95% CI: 0.66-1.20; p = 0.44), clinical remission (RRR = 0.58, 95% CI: 0.24-1.44; p = 0.24), and mucosal healing (RRR = 0.99, 95% CI: 0.69-1.41; p = 0.95), or maintaining clinical remission (RRR = 0.81, 95% CI: 0.46-1.42; p = 0.45) and mucosal healing (RRR = 0.84, 95% CI: 0.48-1.46; p = 0.53), between Asian and Caucasian populations. Future clinical studies should expand the participation of racial minorities to comprehensively assess potential racial differences in the effectiveness of advanced therapies, including IFX, in the context of treating UC.

Differential Manifestations of Inflammatory Bowel Disease Based on Race and Immigration Status

BACKGROUND AND AIMS

The prevalence of inflammatory bowel disease (IBD) is increasing globally. In this context, identifying risk factors for severe disease is important. We examined how race/ethnicity and immigration status influence IBD manifestations, treatments, and outcomes in a diverse, tertiary-care safety-net hospital.

METHODS

We conducted a single-center retrospective review of all IBD inpatients and outpatients treated from 1997-2017. Using logistic regression modeling, we compared disease onset, treatment, and outcomes by race (White, Black, Hispanic, or Asian) and immigration status (US-born vs foreign-born).

RESULTS

A total of 577 patients were identified, of which 29.8% were White, 27.4% were Hispanic, 21.7% were Black, and 13.0% were Asian. Compared to Whites, Asians were more likely to be male (odds ratio [OR] 2.63, 95% confidence interval [CI]: 1.45, 5.00), whereas Blacks were more likely to be diagnosed with Crohn's disease (OR 1.75, 95% CI: 1.10, 2.77) and more likely to undergo IBD-related intestinal resection (OR 2.49, 95% CI: 1.40, 4.50). Compared to US-born patients, foreign-born patients were more likely to be diagnosed with ulcerative colitis (OR 1.77, 95% CI: 1.04, 3.02). They were also less likely to be diagnosed before 16 years of age (OR 0.19, 95% CI: 0.08, 0.41), to have undergone intestinal resections (OR 0.39, 95% CI: 0.19, 0.83), to have received biologics (OR 0.43, 95% CI: 0.25, 0.76), or to have had dermatologic manifestations (OR 0.12, 95% CI: 0.03, 0.41).

CONCLUSION

IBD phenotype varies by race, although foreign-born patients of all races show evidence of later-onset and milder disease. These findings may aid in disease prognostication and clinical management and, furthermore, may provide insight into intrinsic and environmental influences on IBD pathogenesis.

Ethnic Variation Trends in the Use of Ileal Pouch-Anal Anastomosis in Patients With Ulcerative Colitis

Background

Approximately 15%-20% of patients with ulcerative colitis (UC) will require surgery during their lifetime. Ileal pouch-anal anastomosis (IPAA) is the preferred surgical option, which typically requires access to a specialist experienced in surgery for inflammatory bowel diseases (IBD).

Methods

The aims of this study are the assessment of the comparative use of IPAA for UC among different racial/ethnic groups and observe trends over the past decade in the United States as well as the comparative assessment of their respective postoperative outcomes. This was an observational retrospective study using the National Inpatient Sample (NIS) 2009-2018 dataset. All patients with ICD-9/10CM codes for UC were included. The primary outcome was comparative trends in IPAA construction across races/ethnicities in the past decade, which was compared to White patients as reference. Multivariate regression analyses were used to adjust for age, gender, Charlson comorbidity index, income in patient zip code, insurance status, hospital region, location, size, and teaching status.

Results

The number of patients discharged from US hospitals with an associated diagnosis of UC increased between 2009 and 2018, but the number of patients undergoing an IPAA decreased during that time period. Of 1 153 363 admissions related to UC, 60 688 required surgery for UC, of whom 16 601 underwent IPAA in the study period. Of all the patients undergoing surgery for UC, 2862 (4.7%) were Black, while 44 351 were White. This analysis indicated that Black patients were less likely to undergo IPAA both in 2009 and in 2018 compared to Whites. Hispanic patients were significantly less likely to receive IPAA in 2009 but were no longer less likely to receive IPAA in 2018 when compared to Whites.

Conclusions

The use of IPAA among Black patients requiring surgery for UC remains less common than amongst their White counterparts. Further research is needed to determine if racial disparity is a factor in decreased access to specialized care.

Racial Difference in Efficacy of Golimumab in Ulcerative Colitis

BACKGROUND

Observational studies have described racial differences in inflammatory bowel disease (IBD) genetics, clinical manifestations, and outcomes. Whether race impacts response to biologics in IBD is unclear. We conducted a post hoc analysis of phase 2 and 3 randomized clinical trials in ulcerative colitis to evaluate the effect of race on response to golimumab.

METHODS

We analyzed pooled individual-level data from induction and maintenance trials of golimumab through the Yale Open Data Access Project. The primary outcome was clinical response. Secondary outcomes were clinical remission and endoscopic healing. Multivariable logistic regression was performed comparing White vs racial minority groups (Asian, Black, or other race), adjusting for potential confounders.

RESULTS

There were 1006 participants in the induction (18% racial minority) and 783 participants in the maintenance (17% racial minority) trials. Compared with White participants, participants from racial minority groups had significantly lower clinical response (adjusted odds ratio [aOR], 0.43; 95% confidence interval [CI], 0.28-0.66), clinical remission (aOR, 0.41; 95% CI, 0.22-0.77), and endoscopic healing (aOR, 0.48; 95% CI, 0.31-0.74) at week 6. Participants from racial minority groups also had significantly lower clinical remission (aOR, 0.46; 95% CI, 0.28-0.74) and endoscopic healing (aOR, 0.63; 95% CI, 0.41-0.96) at week 30. There were no racial differences in placebo response rates.

CONCLUSIONS

Ulcerative colitis participants from racial minority groups were less likely to achieve clinical response, clinical remission, and endoscopic healing with golimumab compared with White participants in induction and maintenance trials. Further studies are needed to understand the impact of race on therapeutic response in IBD.

The Current State of Care for Black and Hispanic Inflammatory Bowel Disease Patients

Research on the care of inflammatory bowel disease (IBD) patients has been primarily in populations of European ancestry. However, the incidence of IBD, which comprises Crohn's disease and ulcerative colitis, is increasing in different populations around the world. In this comprehensive review, we examine the epidemiology, clinical presentations, disease phenotypes, treatment outcomes, social determinants of health, and genetic and environmental factors in the pathogenesis of IBD in Black and Hispanic patients in the United States. To improve health equity of underserved minorities with IBD, we identified the following priority areas: access to care, accurate assessment of treatment outcomes, incorporation of Black and Hispanic patients in therapeutic clinical trials, and investigation of environmental factors that lead to the increase in disease incidence.

Evaluation of Racial/Ethnic Disparities in the Surgical Management of Inflammatory Bowel Disease

BACKGROUND

Disparities in managing inflammatory bowel disease (IBD) are multifactorial and occur at all stages of treatment, including surgical management. We aim to evaluate postoperative morbidity after abdominopelvic surgery among different racial/ethnic groups after surgical management of CD and UC and account for preoperative characteristics that may impact outcomes.

METHODS

Patients were identified using the National Surgical Quality Improvement Project (NSQIP) file and merged with the targeted proctectomy (2016-2019) and colectomy file (2012-2019). All patients undergoing elective surgical management for ICD9/10 codes for CD and UC were included. The primary outcome was composite postoperative morbidity (CPM), a metric that identifies postoperative morbidity with available variables. Multivariable logistic regression modeling was performed to test the association between race/ethnicity and other risk factors with CPM. Postoperative outcomes were evaluated using propensity score modeling with 1:1 matching without replacement as a secondary analysis.

RESULTS

In both CD and UC, CPM was highest for Black patients with 27.5% (326) and 26.1% (81), respectively. Followed by Hispanic patients with a CPM of 21.1% (73) after surgery for CD (p < 0.001) and 21.2% (31) for Asian patients after resection for UC (p = 0.005). After regression modeling, we found increased odds of CPM for Black patients after surgery for UC (OR 1.48, p = 0.013) and CD (OR 1.17, p < 0.001). Following propensity score matching (PSM), stoma creation rates were higher in Asian (10.4%, p = 0.010) and Hispanic patients (11.9%, p = 0.030) undergoing surgery for CD.

CONCLUSIONS

Black patients are at increased risk of morbidity after surgery for both UC and CD. Increased morbidity in an already vulnerable population warrants targeted interventions, specifically focusing on faster access to specialized care, preoperative optimization, and culturally competent discussions on the benefits of MIS approaches are warranted in order to improve postoperative outcomes.

Ethnicity influences phenotype and clinical outcomes: Comparing a South American with a North American inflammatory bowel disease cohort

Inflammatory bowel disease (IBD), including ulcerative colitis (UC) and Crohn disease (CD), has emerged as a global disease with an increasing incidence in developing and newly industrialized regions such as South America. This global rise offers the opportunity to explore the differences and similarities in disease presentation and outcomes across different genetic backgrounds and geographic locations. Our study includes 265 IBD patients. We performed an exploratory analysis of the databases of Chilean and North American IBD patients to compare the clinical phenotypes between the cohorts. We employed an unsupervised machine-learning approach using principal component analysis, uniform manifold approximation, and projection, among others, for each disease. Finally, we predicted the cohort (North American vs Chilean) using a random forest. Several unsupervised machine learning methods have separated the 2 main groups, supporting the differences between North American and Chilean patients with each disease. The variables that explained the loadings of the clinical metadata on the principal components were related to the therapies and disease extension/location at diagnosis. Our random forest models were trained for cohort classification based on clinical characteristics, obtaining high accuracy (0.86 = UC; 0.79 = CD). Similarly, variables related to therapy and disease extension/location had a high Gini index. Similarly, univariate analysis showed a later CD age at diagnosis in Chilean IBD patients (37 vs 24; P = .005). Our study suggests a clinical difference between North American and Chilean IBD patients: later CD age at diagnosis with a predominantly less aggressive phenotype (39% vs 54% B1) and more limited disease, despite fewer biological therapies being used in Chile for both diseases.

Inflammatory bowel disease in underserved populations: lessons for practice

PURPOSE OF REVIEW

The incidence of inflammatory bowel disease (IBD) is increasing in minority groups across the USA. There are racial and ethnic disparities in IBD care and outcomes that are rooted in historical injustice and inequities in the social determinants of health.

RECENT FINDINGS

Current literature has identified racial, ethnic and sociodemographic disparities in therapeutics and outcomes for IBD, including disease severity, morbidity and mortality.

SUMMARY

Strategies to achieve equity in IBD include tackling structural racism as a driver of health disparities and making actionable changes against multilevel barriers to care.

Racial and Ethnic Distribution of Inflammatory Bowel Disease in the United States

BACKGROUND

The current burden of Crohn's disease (CD) and ulcerative colitis (UC) in minority populations is largely unknown. We sought to evaluate the relative prevalence of CD and UC across racial and ethnic groups within the National Patient-Centered Clinical Research Network (PCORnet).

METHODS

We queried electronic health records from 337 centers from January 2013 to December 2018. We compared the relative prevalence of CD and UC across racial/ethnic groups to the general PCORnet populations using χ 2 and univariable logistic regression.

RESULTS

Among 39,864,077 patients, 114,168 had CD, and 98,225 had UC. Relative to the overall PCORnet population, Black adult patients were significantly less likely than White patients to have a diagnosis of CD (odds ratio [OR], 0.53; 95% CI, 0.52-0.54) or UC (OR, 0.41; 95% CI, 0.40-0.43). Pediatric Black patients were also less likely to have a diagnosis of CD (OR, 0.41; 95% CI, 0.39-0.43) or UC (OR, 0.38; 95% CI, 0.35-0.41). Adult Hispanic patients were less likely to have a diagnosis of CD (OR, 0.33; 95% CI, 0.32-0.34) or UC (OR, 0.45; 95% CI, 0.44-0.46) compared with non-Hispanic patients. Similarly, pediatric Hispanic patients were less likely to have a diagnosis of CD (OR, 0.34; 95% CI, 0.32-0.36) or UC (OR, 0.50; 95% CI, 0.47-0.53).

CONCLUSIONS

Despite the increasing racial and ethnic diversity in the United States, these data suggest that CD and UC are modestly less prevalent among patients of non-White races and Hispanic ethnicity.

Food as Treatment of Inflammatory Bowel Diseases

Inflammatory bowel diseases (IBD), namely, Crohn's disease (CD) and ulcerative colitis (UC), are lifelong and incurable chronic inflammatory diseases affecting 6.8 million people worldwide. By 2030, the prevalence of IBD is estimated to reach 1% of the population in Western countries, and thus there is an urgent need to develop effective therapies to reduce the burden of this disease. Microbiome dysbiosis is at the heart of the IBD pathophysiology, and current research and development efforts for IBD treatments have been focused on gut microbiome regulation. Diet can shape the intestinal microbiome. Diet is also preferred over medication, is safe, and has been proven to be an effective strategy for the management of IBD. Therefore, although often overlooked, dietary interventions targeting the microbiome represent ideal treatments for IBD. Here, I summarize the latest research on diet as a treatment for IBD from infancy to adulthood, compile evidence of the mechanisms of action behind diet as treatment, and, lastly, provide insights into future research focusing on culturally tailored diets for ethnic minority groups with increased incidence of IBD yet underrepresented in nutrition research.

Evaluation of a U.S. National Cohort to Determine Utilization in Colectomy Rates for Ulcerative Colitis Among Ethnicities

BACKGROUND

Colectomy is the curative management for ulcerative colitis (UC). Multiple studies have reported racial disparities for colectomy before the advent of anti-TNF alpha agents. The aim of this study was to describe racial and geographic differences in colectomy rates among hospitalized patients with UC after anti-TNF therapy was introduced.

METHODS

We examined all patients discharged from the hospital between 2010 and 2014 with a primary diagnosis of UC or of complications of UC. The data were evaluated for race and colectomy rates among the hospitalized patients with UC.

RESULTS

The unadjusted national colectomy rate among hospitalized patients with UC between 2010 and 2014 was 3.90 per 1000 hospitalization days (95% confidence interval, 3.72-4.08). The undajusted colectomy rates in African American (2.33 vs 4.35; P < 0.001) and Hispanic patients (3.99 vs 4.35; P ≤ 0.009) were considerably lower than those for White patients. After adjustment for confounders, the incidence rate ratio for African American as compared to White patients was 0.43 (95% confidence interval, 0.32-0.58; P < 0.001). Geographic region of the United States also showed significant variation in colectomy rates, with western regions having the highest rate (4.76 vs 3.20; P < 0.001).

CONCLUSIONS

Racial and geographical disparities persist for the rate of colectomy among hospitalized patients with UC. The national database analysis reveals that colectomy rates for hospitalized African American and Hispanic patients were lower than those for White patients. Further studies are important to determine the social and biologic foundations of these disparities.

Latin Americans and US Hispanics show differences in IBD phenotype: a systematic review with meta-analysis

Latin America has experienced a rise in the prevalence and incidence of inflammatory bowel disease (IBD). Differences in IBD phenotype between Hispanics in Latin America and those in the USA have not been described. We conducted a systematic review with meta-analysis of population-based and cohort studies comparing the phenotype of ulcerative colitis (UC) and Crohn's disease (CD) in Latin Americans and US Hispanics. A systematic search was conducted up to March 2019 using MEDLINE, EMBASE and Google Scholar. Inclusion criterion includes studies describing IBD phenotype in Latin Americans or in US Hispanics. Exclusion criterion includes prevalence or incidence studies not describing phenotype. A random effects model was chosen "a priori" for analysis of pooled proportions. A total of 46 studies were included from Latin America and 7 studies from the USA. The predominant IBD subtype in Latin America was UC with a more balanced UC:CD ratio noted in Puerto Rico (0.53) and Brazil (0.56). UC-related extensive colitis was more common in US Hispanics (0.64) than in Latin Americans (0.38), p<0.001. CD phenotype was similar between US Hispanics and Latin Americans. UC is the predominant IBD subtype in Latin America, with the exception of Puerto Rico and Brazil which demonstrate a more balanced UC:CD ratio. In UC, extensive colitis was more frequently seen in US Hispanics than in Latin Americans. CD phenotype was similar in both US Hispanics and Latin Americans.

Rates of inflammatory bowel disease in Hispanics comparable to non-Hispanic Whites: results of a cohort study

PURPOSE

Previous studies have suggested that inflammatory bowel disease (IBD) occurs at higher rates among non-Hispanic Whites (NHWs) compared to other ethnicities; however, Hispanics as the largest minority in the United States remain underrepresented in IBD research and we hypothesize that they have similar rates of IBD. We examined the epidemiology, demographics, clinical presentation, and treatment of IBD in a predominantly Hispanic cohort in Los Angeles (LA) County.

METHODS

This was a retrospective cohort study based at Olive View-UCLA Medical Center, one of the three major safety-net hospitals in LA County. Electronic medical records from 2015 to 2018 were queried, and biopsy-proven cases of IBD (n = 170) were identified. Outcomes included the incidence and prevalence of IBD, disease distribution, treatment, and IBD-related surgery.

RESULTS

The incidence of IBD among Hispanics was 175 (95% confidence interval [CI] 127-240) and 113 (95% CI 62-200) for NHWs per 100,000 person-years. Prevalence of IBD per 100,000 people was 418 (95% CI 341-512) for Hispanics and 557 (95% CI 431-739) for NHWs. Notably, the proportion of Hispanic IBD patients with a history of smoking was 21.5% vs 50.8% in NHWs (p = 0.011). There were no significant differences between the two groups with regard to Montreal classification, pharmacotherapy, or IBD-related surgery.

CONCLUSIONS

In one of the largest US studies of Hispanics with IBD, and the only one to have both clinical and histopathologic confirmation as inclusion criteria, we found the incidence and prevalence of IBD among Hispanics to be higher than previously recognized and comparable to NHWs. Additionally, Hispanic IBD patients had lower rates of smoking compared to NHWs.

Ethnicity Influences Risk of Inflammatory Bowel Disease (IBD)-Associated Colon Cancer: A Cross-sectional Analysis of Dysplasia Prevalence and Risk Factors in Hispanics and Non-Hispanic Whites With IBD

Background

Inflammatory bowel disease (IBD) is an emerging disease in Hispanics. In this study, we examine the prevalence of IBD-related colon dysplasia (IBD-dys) in Hispanics versus non-Hispanic whites (NHWs) and compare differences in established clinical and environmental risk factors.

Methods

We performed a cross-sectional analysis on adult Hispanics and NHWs with IBD who met criteria for colorectal cancer surveillance and were followed at our center between 2008 and 2018. Clinical variables and IBD phenotype were recorded. Lifestyle IBD-dys risk factors were examined, including smoking and lack of physical activity. Using multivariable regression, we compared the prevalence of IBD-dys in Hispanics versus NHW, using relevant covariates. Receiver operating characteristic and area under the curve were performed to find the best fitting model.

Results

A total of 445 IBD patients were included (148 Hispanics and 297 NHWs). IBD phenotype was similar between groups, except that Hispanics had shorter disease duration, a lower frequency of Crohn’s disease-related complications, and lower reported use of steroids. Frequency of surveillance colonoscopies was similar between Hispanics and NHW. There were no differences in median body mass index between Hispanics and NHW [26.5 (IQR 6.0) vs 25.0 (IQR 6.0), P = 0.40]. Hispanics were less likely than NHW to consume alcohol but smoking history was similar between groups. Three out of 148 Hispanic patients had IBD-dys (2.02%) compared to 29 out of 297 NHWs (9.76%). Adjusting for disease duration, primary sclerosing cholangitis, family history of colon cancer, and smoking, Hispanics had a lower prevalence of IBD-dys compared to NHW [ORadjusted = 0.207 (95% CI 0.046–0.938), P = 0.008].

Conclusions

Hispanics with IBD undergoing surveillance had a lower prevalence of IBD-dys than their NHW counterparts, despite similar risk factors. Future studies should examine dietary and microbial factors that may explain differences in risk.

Trends in the epidemiology of inflammatory bowel disease in Colombia by demographics and region using a nationally representative claims database and characterization of inflammatory bowel disease phenotype in a case series of Colombian patients

The incidence of inflammatory bowel disease (IBD) is on the rise in Latin America. The aims of this study were to examine epidemiologic trends of IBD in Colombia by demographics, region, urbanicity, and to describe the IBD phenotype in a large well-characterized Colombian cohort.We used a national database of 33 million adults encompassing 97.6% of the Colombian population in order to obtain epidemiologic trends of IBD using International Classification of Diseases 10codes for adults with ulcerative colitis (UC) and Crohn disease (CD). We calculated the incidence and prevalence of UC and CD from 2010-2017 and examined epidemiologic trends by urbanicity, demographics, and region. We then examined the IBD phenotype (using Montreal Classification), prevalence of IBD-related surgeries, and types of IBD-medications prescribed to adult patients attending a regional IBD clinic in Medellin, Colombia between 2001 and 2017.The incidence of UC increased from 5.59/100,000 in 2010 to 6.3/100,000 in 2017 (relative risk [RR] 1.12, confidence interval (CI) (1.09-1.18), P < .0001). While CD incidence did not increase, the prevalence increased within this period. The Andes region had the highest incidence of IBD (5.56/100,000 in 2017). IBD was seen less in rural regions in Colombia (RR=.95, CI (0.92-0.97), p < .01). An increased risk of IBD was present in women, even after adjusting for age and diagnosis year (RR 1.06 (1.02-1.08), P = .0003). The highest IBD risk occurred in patients 40 to 59 years of age. In the clinic cohort, there were 649 IBD patients: 73.7% UC and 24.5% CD. Mean age of diagnosis in CD was 41.0 years and 39.9 years in UC. UC patients developed mostly pancolitis (43%). CD patients developed mostly ileocolonic disease and greater than a third of patients had an inflammatory, non-fistulizing phenotype (37.7%). A total of 16.7% of CD patients had perianal disease. CD patients received more biologics than UC patients (odds ratio: 3.20, 95% CI 2.19-4.69 P < .001).Using both a national representative sample and a regional clinic cohort, we find that UC is more common in Colombia and is on the rise in urban regions; especially occurring in an older age cohort when compared to Western countries. Future studies are warranted to understand evolving environmental factors explaining this rise.

Effects of Race and Ethnicity on Diagnosis and Management of Inflammatory Bowel Diseases

Although Crohn's disease (CD) and ulcerative colitis (UC) have been considered as disorders that affect individuals of European ancestry, the epidemiology of the inflammatory bowel diseases (IBDs) is changing. Coupled with the increasing incidence of IBD in previously low-incidence areas, the population demographics of IBD in the United States are also changing, with increases among non-White races and ethnicities. It is therefore important to fully understand the epidemiology and progression of IBD in different racial and ethnic groups, and the effects of race and ethnicity on access to care, use of resources, and disease-related outcomes. We review differences in IBD development and progression among patients of different races and ethnicities, discussing the effects of factors such as access to care, delays in diagnosis, and health and disease perception on disparities in IBD care and outcomes. We identify research priorities for improving health equity among minority patients with IBD.

Apparent Disparities in Hospital Admission and Biologic Use in the Management of Inflammatory Bowel Disease between 2014–2018 in Some Black and Ethnic Minority (BEM) Populations in England

Discrimination in delivery of care to patients with inflammatory bowel disease has been reported in the UK with regards to the South Asian population. This paper explores whether it is also true for Afro-Caribbean and Eastern European migrant workers. Treatment was investigated in NHS trusts, which served substantial migrant and minority communities, through Freedom of Information requests for data on use of biologics or hospital admissions over a five year period. In Bristol, Nottingham, Derby and Burton, Princess Alexandra Hospital Trust in Harlow, Essex and Kings College Hospital NHS Foundation Trust in South London Afro-Caribbean patients were treated significantly less often than White British patients. Eastern European migrant workers, were admitted significantly less often in Croydon, and the Princess Alexandra Hospital NHS Trust in Essex. However, there was no evidence of barriers to access for these communities in Wye Valley Trust, University Hospitals of Bristol NHS Foundation Trust or Queen Elizabeth Hospital Kings Lynn. In North West Anglia both South Asian and Eastern European patients were significantly less likely to be admitted to hospital than members of the White British community. It is incumbent on all gastroenterologists to consider their own clinical practice and encourage their hospital units to adopt effective policies which remove discriminatory barriers to good quality care.

Regional variation of pediatric inflammatory bowel disease in Saudi Arabia: Results from a multicenter study

BACKGROUND

Incidence and severity variations of inflammatory bowel disease (IBD) have been reported from Western populations between continents and regions of the same countries. However, no data were available from other countries.

AIM

To investigate the regional differences in the IBD profiles of pediatric patients from the Kingdom of Saudi Arabia.

METHODS

Data from a national multicenter IBD study were used. The incidence, time trend, and clinical presentation of Crohn’s disease (CD) and ulcerative colitis (UC) in the Central region (CR), Western region (WR), and Eastern region (ER) were analyzed and compared. Statistical analysis included Poisson regression analysis for incidence variation and Chi-square test for demographic and clinical parameters. A P < 0.05 was considered significant.

RESULTS

The prevalence of positive family history was lower in children with CD from the ER than the CR or the WR. Consanguinity rate was higher in children with CD and UC from the CR and the ER, respectively. The incidences and time trends of CD and UC were not significantly different between regions. In the ER, a significantly higher percentage of children with CD presented with abdominal pain (P < 0.001), blood in stools (P = 0.048), stricturing or penetrating disease (P = 0.029), higher erythrocyte sedimentation rate (P < 0.001), higher C-reactive protein (P < 0.001), higher anemia (P = 0.017), and lower albumin level (P = 0.014). For children with UC from the ER, a significantly higher percentage presented with anemia (P = 0.006) and a lower percentage with pancolitis (P < 0.001).

CONCLUSION

The most important finding is the identification of significantly more severe presentation of CD in the ER of the Kingdom of Saudi Arabia. Prospective studies are needed to explain such variations.

Higher Surgical Morbidity for Ulcerative Colitis Patients in the Era of Biologics

OBJECTIVE

To investigate differences in surgical approach and postoperative outcomes for patients with ulcerative colitis (UC) before and after the introduction of biologic therapy.

BACKGROUND

Biologic use has dramatically increased since Food and Drug Administration approval of infliximab. Studies conflict as to the effect of these agents on surgical outcomes with some demonstrating worse surgical outcomes whereas others have found no difference.

METHODS

We used an administrative, all-payer, all-age group database located in New York State. Patients were included if they had a diagnosis of UC and underwent surgery for their disease from 1995 to 2013. Outcomes were compared for the index admission, at 90-day, and 1-year follow up.

RESULTS

A total of 7070 patients were included for analysis; 54% patients underwent surgery between 1995 and 2005 and the remaining 46% patients underwent surgery between 2005 and 2013. There was a significant increase in the proportion of patients who underwent at least 3 procedures after 2005(14% vs 9%, P < 0.01). On adjusted analysis, patients undergoing surgery after 2005 had higher likelihood of major events (odd s ratio, OR = 1.42; 95% confidence interval, CI = 1.13-1.78), procedural complications (OR = 1.42; 95% CI = 1.20-1.68), and nonroutine discharge (OR = 3.17; 95% CI = 2.79-3.60) during the index admission. Similar trends for worse adjusted outcomes in patients initially undergoing surgery after 2005 were seen at 90-day and 1-year follow up.

CONCLUSIONS

Since the introduction of biologic agents in 2005, surgery for patients with UC is more likely to require multiple procedures. Despite robust adjustments, patients having surgery recently have worse postoperative morbidity during the index hospitalization, at 90-day and 1-year follow up. More work is necessary to improve outcomes in these higher risk patients that undergo surgery.

Evidence of Differences and Discrimination in the Delivery of Care: Colorectal Screening in Healthy People and in the Care and Surveillance of Patients with Inflammatory Bowel Disease

Objectives: In this review the management of colorectal disease will be investigated as an exemplar of common practice in the UK in an attempt to identify factors responsible for the more general experiences of patients from ethnic minorities. Within this field such populations have a lower uptake of cancer screening programmes and their experience of day-to-day care for chronic gastrointestinal disorders is poor. Study design: PubMed and Google Scholar were reviewed in 2016 to identify publications concerning colorectal screening in patients with inflammatory bowel disease and healthy communities. Methods: Data were extracted from each paper and the references exploded to identify other potential reports. Results: It is reported that barriers exist both at individual and access levels but little has been done to overcome these. There have been a number of suggestions as to how to provide equitable access, but there is a clear need to ensure that these are evidence based and have been tested and shown to be effective in clinical trials. Conclusions: Clearly, current systems of surveillance and screening will only make a difference if they provide effective and acceptable services to all potential clients. Most programmes fail to address the specific risks and anxieties of minority groups, which are thought to be poorly compliant. This review considers those factors that may play a part and suggests approaches that could overcome these deficiencies. Some clues as to these factors may come from work with patients with chronic disorders.

A comprehensive review and update on ulcerative colitis. Dis Mon 2019;65:100851. [PMID: 30837080 DOI: 10.1016/j.disamonth.2019.02.004]

Ulcerative colitis (UC) is a chronic idiopathic inflammatory bowel disorder of the colon that causes continuous mucosal inflammation extending from the rectum to the more proximal colon, with variable extents. UC is characterized by a relapsing and remitting course. UC was first described by Samuel Wilks in 1859 and it is more common than Crohn's disease worldwide. The overall incidence and prevalence of UC is reported to be 1.2-20.3 and 7.6-245 cases per 100,000 persons/year respectively. UC has a bimodal age distribution with an incidence peak in the 2nd or 3rd decades and followed by second peak between 50 and 80 years of age. The key risk factors for UC include genetics, environmental factors, autoimmunity and gut microbiota. The classic presentation of UC include bloody diarrhea with or without mucus, rectal urgency, tenesmus, and variable degrees of abdominal pain that is often relieved by defecation. UC is diagnosed based on the combination of clinical presentation, endoscopic findings, histology, and the absence of alternative diagnoses. In addition to confirming the diagnosis of UC, it is also important to define the extent and severity of inflammation, which aids in the selection of appropriate treatment and for predicting the patient's prognosis. Ileocolonoscopy with biopsy is the only way to make a definitive diagnosis of UC. A pathognomonic finding of UC is the presence of continuous colonic inflammation characterized by erythema, loss of normal vascular pattern, granularity, erosions, friability, bleeding, and ulcerations, with distinct demarcation between inflamed and non-inflamed bowel. Histopathology is the definitive tool in diagnosing UC, assessing the disease severity and identifying intraepithelial neoplasia (dysplasia) or cancer. The classical histological changes in UC include decreased crypt density, crypt architectural distortion, irregular mucosal surface and heavy diffuse transmucosal inflammation, in the absence of genuine granulomas. Abdominal computed tomographic (CT) scanning is the preferred initial radiographic imaging study in UC patients with acute abdominal symptoms. The hallmark CT finding of UC is mural thickening with a mean wall thickness of 8 mm, as opposed to a 2-3 mm mean wall thickness of the normal colon. The Mayo scoring system is a commonly used index to assess disease severity and monitor patients during therapy. The goals of treatment in UC are three fold-improve quality of life, achieve steroid free remission and minimize the risk of cancer. The choice of treatment depends on disease extent, severity and the course of the disease. For proctitis, topical 5-aminosalicylic acid (5-ASA) drugs are used as the first line agents. UC patients with more extensive or severe disease should be treated with a combination of oral and topical 5-ASA drugs +/- corticosteroids to induce remission. Patients with severe UC need to be hospitalized for treatment. The options in these patients include intravenous steroids and if refractory, calcineurin inhibitors (cyclosporine, tacrolimus) or tumor necrosis factor-α antibodies (infliximab) are utilized. Once remission is induced, patients are then continued on appropriate medications to maintain remission. Indications for emergency surgery include refractory toxic megacolon, colonic perforation, or severe colorectal bleeding.

Dietary interventions for induction and maintenance of remission in inflammatory bowel disease

BACKGROUND

Inflammatory bowel disease (IBD), comprised of Crohn's disease (CD) and ulcerative colitis (UC), is characterized by chronic mucosal inflammation, frequent hospitalizations, adverse health economics, and compromised quality of life. Diet has been hypothesised to influence IBD activity.

OBJECTIVES

To evaluate the efficacy and safety of dietary interventions on IBD outcomes.

SEARCH METHODS

We searched the Cochrane IBD Group Specialized Register, CENTRAL, MEDLINE, Embase, Web of Science, Clinicaltrials.gov and the WHO ICTRP from inception to 31 January 2019. We also scanned reference lists of included studies, relevant reviews and guidelines.

SELECTION CRITERIA

We included randomized controlled trials (RCTs) that compared the effects of dietary manipulations to other diets in participants with IBD. Studies that exclusively focused on enteral nutrition, oral nutrient supplementation, medical foods, probiotics, and parenteral nutrition were excluded.

DATA COLLECTION AND ANALYSIS

Two review authors independently performed study selection, extracted data and assessed bias using the risk of bias tool. We conducted meta-analyses where possible using a random-effects model and calculated the risk ratio (RR) and corresponding 95% confidence interval (CI) for dichotomous outcomes. We assessed the certainty of evidence using GRADE.

MAIN RESULTS

The review included 18 RCTs with 1878 participants. The studies assessed different dietary interventions for active CD (six studies), inactive CD (seven studies), active UC (one study) and inactive UC (four studies). Dietary interventions involved either the consumption of low amounts or complete exclusion of one or more food groups known to trigger IBD symptoms. There was limited scope for data pooling as the interventions and control diets were diverse. The studies were mostly inadequately powered. Fourteen studies were rated as high risk of bias. The other studies were rated as unclear risk of bias.The effect of high fiber, low refined carbohydrates, low microparticle diet, low calcium diet, symptoms-guided diet and highly restricted organic diet on clinical remission in active CD is uncertain. At 4 weeks, remission was induced in: 100% (4/4) of participants in the low refined carbohydrates diet group compared to 0% (0/3) of participants in the control group (RR 7.20, 95% CI 0.53 to 97.83; 7 participants; 1 study; very low certainty evidence). At 16 weeks, 44% (23/52) of participants in the low microparticle diet achieved clinical remission compared to 25% (13/51) of control-group participants (RR 3.13, 95% CI 0.22 to 43.84; 103 participants; 2 studies; I² = 73%; very low certainty evidence). Fifty per cent (16/32) of participants in the symptoms-guided diet group achieved clinical remission compared to 0% (0/19) of control group participants (RR 20.00, 95% CI 1.27 to 315.40; 51 participants ; 1 study; very low certainty evidence) (follow-up unclear). At 24 weeks, 50% (4/8) of participants in the highly restricted organic diet achieved clinical remission compared to 50% (5/10) of participants in the control group (RR 1.00, 95% CI 0.39 to 2.53; 18 participants; 1 study; very low certainty evidence). At 16 weeks, 37% (16/43) participants following a low calcium diet achieved clinical remission compared to 30% (12/40) in the control group (RR 1.24, 95% CI 0.67 to 2.29; 83 participants; 1 study; very low certainty evidence).The effect of low refined carbohydrate diets, symptoms-guided diets and low red processed meat diets on relapse in inactive CD is uncertain. At 12 to 24 months, 67% (176/264) of participants in low refined carbohydrate diet relapsed compared to 64% (193/303) in the control group (RR 1.04, 95% CI 0.87 to 1.25; 567 participants; 3 studies; I² = 35%; low certainty evidence). At 6 to 24 months, 48% (24/50) of participants in the symptoms-guided diet group relapsed compared to 83% (40/48) participants in the control diet (RR 0.53, 95% CI 0.28 to 1.01; 98 participants ; 2 studies; I² = 54%; low certainty evidence). At 48 weeks, 66% (63/96) of participants in the low red and processed meat diet group relapsed compared to 63% (75/118) of the control group (RR 1.03, 95% CI 0.85 to 1.26; 214 participants; 1 study; low certainty evidence). At 12 months, 0% (0/16) of participants on an exclusion diet comprised of low disaccharides / grains / saturated fats / red and processed meat experienced clinical relapse compared to 26% (10/38) of participants on a control group (RR 0.11, 95% CI 0.01 to 1.76; 54 participants; 1 study; very low certainty evidence).The effect of a symptoms-guided diet on clinical remission in active UC is uncertain. At six weeks, 36% (4/11) of symptoms-guided diet participants achieved remission compared to 0% (0/10) of usual diet participants (RR 8.25, 95% CI 0.50 to 136.33; 21 participants; 1 study; very low certainty evidence).The effect of the Alberta-based anti-inflammatory diet, the Carrageenan-free diet or milk-free diet on relapse rates in inactive UC is uncertain. At 6 months, 36% (5/14) of participants in the Alberta-based anti-inflammatory diet group relapsed compared to 29% (4/14) of participants in the control group (RR 1.25, 95% CI 0.42 to 3.70; 28 participants; 1 study; very low certainty evidence). Thirty per cent (3/10) of participants following the carrageenan-free diet for 12 months relapsed compared to 60% (3/5) of the participants in the control group (RR 0.50, 95% CI 0.15 to 1.64; 15 participants; 1 study; very low certainty evidence). At 12 months, 59% (23/39) of milk free diet participants relapsed compared to 68% (26/38) of control diet participants (RR 0.83, 95% CI 0.60 to 1.15; 77 participants; 2 studies; I² = 0%; low certainty evidence).None of the included studies reported on diet-related adverse events.

AUTHORS' CONCLUSIONS

The effects of dietary interventions on CD and UC are uncertain. Thus no firm conclusions regarding the benefits and harms of dietary interventions in CD and UC can be drawn. There is need for consensus on the composition of dietary interventions in IBD and more RCTs are required to evaluate these interventions. Currently, there are at least five ongoing studies (estimated enrollment of 498 participants). This review will be updated when the results of these studies are available.

Hispanic Americans and Non-Hispanic White Americans Have a Similar Inflammatory Bowel Disease Phenotype: A Systematic Review with Meta-Analysis

BACKGROUND

Inflammatory bowel disease (IBD) is a devastating immune-mediated disease on the rise in Hispanics living in the USA. Prior observational studies comparing IBD characteristics between Hispanics and non-Hispanic whites (NHW) have yielded mixed results.

AIMS

We performed a meta-analysis of observational studies examining IBD phenotype in Hispanics compared to NHW.

METHODS

We conducted a systematic search of US-based studies comparing IBD subtype (Ulcerative Colitis: UC or Crohn's disease: CD) and phenotype (disease location and behavior) between Hispanics and NHW. We evaluated differences in age at IBD diagnosis, the presence of family history and smoking history. A random effects model was chosen "a priori." Categorical and continuous variables were analyzed using odds ratio (OR) or standard mean difference (SMD), respectively.

RESULTS

Seven studies were included with 687 Hispanics and 1586 NHW. UC was more common in Hispanics compared to NHW (OR 2.07, CI 1.13-3.79, p = 0.02). Location of disease was similar between Hispanics and NHW except for the presence of upper gastrointestinal CD, which was less common in Hispanics (OR 0.58, CI 0.32-1.06, p = 0.07). Hispanics were less likely to smoke (OR 0.48, CI 0.26-0.89, p = 0.02) or have a family history of IBD (OR 0.35, CI 0.22-0.55, p < 0.001). CD behavior classified by Montreal classification and age at IBD diagnosis were similar between Hispanics and NHW.

CONCLUSION

UC was more common among US Hispanics compared to NHW. Age at IBD diagnosis is similar for both Hispanics and NHW. For CD, disease behavior is similar, but Hispanics show a trend for less upper gastrointestinal involvement. A family history of IBD and smoking history were less common in Hispanics.

Ethnicity Influences Phenotype and Outcomes in Inflammatory Bowel Disease: A Systematic Review and Meta-analysis of Population-based Studies

BACKGROUND & AIMS

Inflammatory bowel diseases (IBDs) (Crohn's disease [CD], ulcerative colitis) are global diseases. Similarities and differences in disease presentation and outcomes across different geographic regions and ethnic groups have not been compared previously.

METHODS

We performed a systematic review and meta-analysis of population-based cohort studies examining the phenotype and outcome of IBD across ethnic groups categorized as Whites, Blacks, Hispanics, and Asians. Further stratification was performed by migration status (native or immigrant). Pooled proportions of disease location, behavior, medication, and surgery use were calculated by using a random-effects model and compared statistically.

RESULTS

Our final analysis included 198 unique studies reporting outcomes on 525,425 IBD patients (Caucasian, 65%; Asian, 30%; Hispanic, 2%; and Black, 1%). CD in Asians but not other ethnicities demonstrated a strong male predominance. Family history of IBD was infrequent in Asian patients. Both Black and Asian CD patients demonstrated perianal involvement more frequently. Surgery for both CD and UC was less common in Asians than Caucasians. Compared with native residents, a family history of IBD was reported more often among immigrant IBD patients, but no significant differences were noted in phenotype.

CONCLUSIONS

We demonstrate significant variation in the demographic distribution, familial predisposition, phenotype, and outcomes of IBD between Caucasians, Blacks, Hispanics, and Asians. There is need for further study to understand the biology behind this variation.

Epidemiology of inflammatory bowel disease in racial and ethnic migrant groups

AIM

To summarise the current literature and define patterns of disease in migrant and racial groups.

METHODS

A structured key word search in Ovid Medline and EMBASE was undertaken in accordance with PRISMA guidelines. Studies on incidence, prevalence and disease phenotype of migrants and races compared with indigenous groups were eligible for inclusion.

RESULTS

Thirty-three studies met the inclusion criteria. Individual studies showed significant differences in incidence, prevalence and disease phenotype between migrants or race and indigenous groups. Pooled analysis could only be undertaken for incidence studies on South Asians where there was significant heterogeneity between the studies [95% for ulcerative colitis (UC), 83% for Crohn’s disease (CD)]. The difference between incidence rates was not significant with a rate ratio South Asian: Caucasian of 0.78 (95%CI: 0.22-2.78) for CD and 1.39 (95%CI: 0.84-2.32) for UC. South Asians showed consistently higher incidence and more extensive UC than the indigenous population in five countries. A similar pattern was observed for Hispanics in the United States. Bangladeshis and African Americans showed an increased risk of CD with perianal disease.

CONCLUSION

This review suggests that migration and race influence the risk of developing inflammatory bowel disease. This may be due to different inherent responses upon exposure to an environmental trigger in the adopted country. Further prospective studies on homogenous migrant populations are needed to validate these observations, with a parallel arm for in-depth investigation of putative drivers.

Hispanics Coming to the US Adopt US Cultural Behaviors and Eat Less Healthy: Implications for Development of Inflammatory Bowel Disease

INTRODUCTION

The incidence of inflammatory bowel disease (IBD) among US Hispanics is rising. Adoption of an American diet and/or US acculturation may help explain this rise.

AIMS

To measure changes in diet occurring with immigration to the USA in IBD patients and controls, and to compare US acculturation between Hispanics with versus without IBD. Last, we examine the current diet of Hispanics with IBD compared to the diet of Hispanic controls.

METHODS

This was a cross-sectional study of Hispanic immigrants with and without IBD. Participants were recruited from a university-based GI clinic. All participants completed an abbreviated version of the Stephenson Multi-Group Acculturation Scale and a 24-h diet recall (the ASA-24). Diet quality was calculated using the Healthy Eating Index (HEI-2010).

RESULTS

We included 58 participants: 29 controls and 29 IBD patients. Most participants were Cuban or Colombian. Most participants, particularly those with IBD, reported changing their diet after immigration (72% of IBD and 57% of controls). IBD participants and controls scored similarly on US and Hispanic acculturation measures. IBD patients and controls scored equally poorly on the HEI-2010, although they differed on specific measures of poor intake. IBD patients reported a higher intake of refined grains and lower consumption of fruits, whereas controls reported higher intake of empty calories (derived from fat and alcohol).

CONCLUSION

The majority of Hispanics change their diet upon immigration to the USA and eat poorly irrespective of the presence of IBD. Future studies should examine gene-diet interactions to better understand underlying causes of IBD in Hispanics.

The Imbalance between n-6/n-3 Polyunsaturated Fatty Acids and Inflammatory Bowel Disease: A Comprehensive Review and Future Therapeutic Perspectives

Eating habits have changed dramatically over the years, leading to an imbalance in the ratio of n-6/n-3 polyunsaturated fatty acids (PUFAs) in favour of n-6 PUFAs, particularly in the Western diet. Meanwhile, the incidence of inflammatory bowel disease (IBD) is increasing worldwide. Recent epidemiological data indicate the potential beneficial effect of n-3 PUFAs in ulcerative colitis (UC) prevention, whereas consumption of a higher ratio of n-6 PUFAs versus n-3 PUFAs has been associated with an increased UC incidence. The long-chain dietary n-3 PUFAs are the major components of n-3 fish oil and have been shown to have anti-inflammatory properties in several chronic inflammatory disorders, being involved in the regulation of immunological and inflammatory responses. Despite experimental evidence implying biological plausibility, clinical data are still controversial, especially in Crohn’s disease. Clinical trials of fish-oil derivatives in IBD have produced mixed results, showing beneficial effects, but failing to demonstrate a clear protective effect in preventing clinical relapse. Such data are insufficient to make a recommendation for the use of n-3 PUFAs in clinical practice. Here, we present the findings of a comprehensive literature search on the role of n-3 PUFAs in IBD development and treatment, and highlight new therapeutic perspectives.

The Impact of Ethnicity and Country of Birth on Inflammatory Bowel Disease Phenotype: a Prospective Cohort Study

BACKGROUND AND AIMS

The number of patients with inflammatory bowel disease [IBD], of non-Caucasian descent in Western Europe, is increasing. We aimed to explore the impact of ethnicity and country of birth on IBD phenotype.

METHODS

IBD patients treated in the eight University Medical Centers in The Netherlands [Dutch IBD Biobank] were divided into two groups according to their ethnicity: 1] Caucasian patients of Western and Central European descent [CEU]; and 2] patients of non-Caucasian descent [non-CEU]. The non-CEU group was subdivided according to country of birth, into: born in The Netherlands or Western Europe [non-CEU European born]; or born outside Western-Europe who migrated to The Netherlands [non-CEU non-European born]. Both comparisons were analysed for phenotype differences [by chi-square test].

RESULTS

The Dutch IBD Biobank included 2921 CEU patients and 233 non-CEU patients. Non-CEU Crohn's disease [CD] patients more often had upper gastro-intestinal disease [16% vs 8%, p = 0.001] and anal stenosis [10% vs 4%, p = 0.002] than CEU CD patients. The use of anti-tumour necrosis factor [TNF] agents and immunomodulators was higher in non-CEU IBD patients than in CEU IBD patients [45% vs 38%, p = 0.042] and [77% vs 66%, p = 0.001], respectively. Non-CEU IBD patients born in Europe [n = 116] were diagnosed at a lower age than non-CEU IBD patients born outside Europe [n = 115] [at 22.7 vs 28.9 years old, p < 0.001].

CONCLUSION

Non-Caucasians had more severe disease behaviour than Caucasians. Non-CEU patients born in Europe were diagnosed at a lower age with IBD than those born outside Europe who migrated to The Netherlands.

Minority Pediatric Patients with Inflammatory Bowel Disease Demonstrate an Increased Length of Stay

BACKGROUND

Genetic and other biological factors may lead to differences in disease behavior among children with inflammatory bowel disease of different races, which may be further modified by disparities in care delivery. Using the Kids' Inpatient Database, we aimed to evaluate differences in the management of pediatric patients with inflammatory bowel disease by race, focusing on length of stay (LOS).

METHODS

We performed a cross-sectional analysis using 2000 to 2012 data from the Kids' Inpatient Database, a nationally representative database. We identified pediatric patients (≤18 years of age) with discharge diagnoses of Crohn's disease (CD) or ulcerative colitis (UC). We used multivariable logistic regression to evaluate the relationship between race and LOS, controlling for age, payer status need for surgery, and year of admission.

RESULTS

We identified 27,295 hospitalizations for children with inflammatory bowel disease (62% CD and 38% UC), Compared with white patients with CD, black (adjusted odds ratio 1.37; 95% confidence interval, 1.22-1.53; P < 0.001) and Hispanic patients (adjusted odds ratio: 1.37; 95% confidence interval: 1.19-1.59; P < 0.001) with CD demonstrated increased odds of a LOS greater than the 75th percentile. When compared with white patients with UC, Hispanic patients also demonstrated increased odds of a LOS greater than the 75th percentile (adjusted odds ratio: 1.20; 95% confidence interval, 1.02-1.42, P = 0.015).

CONCLUSIONS

After controlling for age, year of admission, and clinical phenotypes, black and Hispanic patients with CD and Hispanic patients with UC had longer LOS than white patients. These may be due to differences in provider/hospital characteristics, socioeconomic differences, and/or differences in genetics and other biological factors (see Video Abstract, Supplemental Digital Content 1, http://links.lww.com/IBD/B656).

Familial and ethnic risk in inflammatory bowel disease

Familial aggregation in inflammatory bowel disease (IBD) has been established for several decades, reflecting shared genetic and environmental susceptibility. A positive family history remains the strongest recognizable risk factor for the development of IBD and is reported in around 8-12% of IBD patients. Crohn’s disease shows a more frequent familial pattern than ulcerative colitis. The risk of developing IBD in first-degree relatives of an affected proband is increased 4- to 8-fold. The risk for twins and children born from couples who both have IBD is also substantially higher; a cumulative effect of the number of family members affected has been described, with the highest incidence being described for families with three or more affected members. Herein, we review the available evidence regarding familial IBD, and briefly discuss the variation of IBD across different races and ethnicities, hoping to provide a useful update and a practical guide that can serve clinicians as a guide for counseling.

Dietary interventions for induction and maintenance of remission in inflammatory bowel disease

This is a protocol for a Cochrane Review (Intervention). The objectives are as follows:

The objective of this systematic review is to evaluate the efficacy and safety of dietary interventions on IBD outcomes.

Inflammatory bowel disease is presenting sooner after immigration in more recent US immigrants from Cuba

BACKGROUND

Despite a rising incidence of inflammatory bowel disease (IBD) in Hispanics in the United States, there are no studies examining the relationship between immigrant generation and IBD onset among Hispanics.

AIMS

To determine whether age of IBD diagnosis, time from immigration to IBD diagnosis and IBD phenotype, differed across immigration periods in South Florida Cuban immigrants.

METHODS

This was a cohort of consecutively identified Cuban-born adults who developed IBD in the United States and were followed in gastroenterology (GI) clinic. We divided time cohorts of immigration by historical relevance: before 1980, 1980-1994 and 1995-to-present. We examined differences across time cohorts in diagnosis age, time from immigration to IBD diagnosis, and IBD phenotype (ie, IBD type, disease location).

RESULTS

A total of 130 Cuban patients with IBD were included. Age of IBD diagnosis was older in Cubans arriving before 1980 than in those arriving between 1980-1994 or after 1995 (44.7 vs 33.79 and 33.71, respectively, P<.0001). Time between immigration and diagnosis was shorter in patients arriving to the US after 1980 (31.77 years, Standard deviation (SD) 12.83 (<1980) vs 17.13 years, SD 8.55 (1980-1994) and 8.30 years, SD 4.72 (1995-to-present). IBD phenotype, including type of IBD, disease location and surgeries, did not differ significantly across time cohorts.

CONCLUSIONS

Our study describes changing patterns of IBD onset following immigration in Cubans, suggesting that environmental changes either in the United States, Cuba or both are resulting in faster IBD onset in younger immigrant generations. These studies can inform the search for environmental triggers that may result in IBD.

Re: Genome-Wide Association Study Identifies African-Specific Susceptibility Loci in African Americans With Inflammatory Bowel Disease

BACKGROUND & AIMS

The inflammatory bowel diseases (IBD) ulcerative colitis (UC) and Crohn’s disease (CD) cause significant morbidity and are increasing in prevalence among all populations, including African Americans. More than 200 susceptibility loci have been identified in populations of predominantly European ancestry, but few loci have been associated with IBD in other ethnicities.

METHODS

We performed 2 high-density, genome-wide scans comprising 2345 cases of African Americans with IBD (1646 with CD, 583 with UC, and 116 inflammatory bowel disease unclassified) and 5002 individuals without IBD (controls, identified from the Health Retirement Study and Kaiser Permanente database). Single-nucleotide polymorphisms (SNPs) associated at P < 5.0 × 10⁻⁸ in meta-analysis with a nominal evidence (P < .05) in each scan were considered to have genome-wide significance.

RESULTS

We detected SNPs at HLA-DRB1, and African-specific SNPs at ZNF649 and LSAMP, with associations of genome-wide significance for UC. We detected SNPs at USP25 with associations of genome-wide significance for IBD. No associations of genome-wide significance were detected for CD. In addition, 9 genes previously associated with IBD contained SNPs with significant evidence for replication (P < 1.6 × 10⁻⁶): ADCY3, CXCR6, HLA-DRB1 to HLA-DQA1 (genome-wide signifi-cance on conditioning), IL12B, PTGER4, and TNC for IBD; IL23R, PTGER4, and SNX20 (in strong linkage disequilibrium with NOD2) for CD; and KCNQ2 (near TNFRSF6B) for UC. Several of these genes, such as TNC (near TNFSF15), CXCR6, and genes associated with IBD at the HLA locus, contained SNPs with unique association patterns with African-specific alleles.

CONCLUSIONS

We performed a genome-wide association study of African Americans with IBD and identified loci associated with UC in only this population; we also replicated IBD, CD, and UC loci identified in European populations. The detection of variants associated with IBD risk in only people of African descent demonstrates the importance of studying the genetics of IBD and other complex diseases in populations beyond those of European ancestry.

Genetic Characterization and Influence on Inflammatory Bowel Disease Expression in a Diverse Hispanic South Florida Cohort

OBJECTIVES

Hispanics represent an understudied inflammatory bowel disease (IBD) population. Prior studies examining genetic predisposition to IBD in Hispanics are limited. In this study, we examined whether European-derived IBD variants confer risk in Hispanics and their influence on IBD phenotype in Hispanics compared to non-Hispanic whites (NHW).

METHODS

Self-identified Hispanics and NHWs with IBD were included. Hispanic controls were included for our genetic analyses. We performed single-variant testing at previously identified Crohn's disease (CD) and ulcerative colitis (UC) IBD variants in Hispanic cases and controls. These risk variants were used to compute individual genetic risk scores. Genetic risk scores and phenotype associations were compared between Hispanic and NHW.

RESULTS

A total of 1,115 participants were included: 698 controls and 417 IBD patients (230 Hispanics). We found evidence of association within our Hispanic cohort at 22 IBD risk loci, with ~76% of the risk loci demonstrating over-representation of the European risk allele; these included loci corresponding to IL23R and NOD2 genes. CD genetic risk score for Hispanics (199.67) was similar to the score for NHW (200.33), P=0.51; the same was true in UC. Genetic risk scores did not predict IBD phenotype or complications in Hispanics or NHW except for a younger age of CD onset in Hispanics (P=0.04).

CONCLUSIONS

This study highlights the fundamental importance of these loci in IBD pathogenesis including in our diverse Hispanic population. Future studies looking at non-genetic mechanisms of disease are needed to explain differences in age of presentation and phenotype between Hispanics and NHW.

Determinants of Healthcare Utilization Among Veterans with Inflammatory Bowel Disease

BACKGROUND

Identifying patient-level and disease-specific predictors of healthcare utilization in inflammatory bowel disease (IBD) may allow targeted interventions to reduce costs and improve outcomes.

AIM

To identify demographic and clinical predictors of healthcare utilization among veterans with IBD.

METHODS

We conducted a single-center cross-sectional study of veterans with IBD from 1998 to 2010. Demographics and disease characteristics were abstracted by manual chart review. Annual number of IBD-related visits was estimated by dividing total number of IBD-related inpatient and outpatient encounters by duration of IBD care. Associations between predictors of utilization were determined using stepwise multivariable linear regression.

RESULTS

Overall, 676 patients (56% ulcerative colitis (UC), 42% Crohn's disease (CD), and 2% IBD unclassified (IBDU)) had mean 3.08 IBD-related encounters annually. CD patients had 3.59 encounters compared to 2.73 in UC (p < 0.01). In the multivariable model, Hispanics had less visits compared to Caucasians and African-Americans (2.09 vs. 3.09 vs. 3.42), current smokers had more visits than never smokers (3.54 vs. 2.43, p = 0.05), and first IBD visit at age <40 had more visits than age >65 (3.84 vs. 1.75, p = 0.04). UC pancolitis was associated with more visits than proctitis (3.47 vs. 2.15, p = 0.04). CD penetrating phenotype was associated with more encounters than inflammatory type (4.68 vs. 4.15, p = 0.04).

CONCLUSIONS

We found that current tobacco use, age <40 at first IBD visit, UC pancolitis, and CD fistuilizing phenotype in addition to Caucasian and African-American race were independent predictors of increased healthcare utilization. Interventions should be targeted at these groups to decrease healthcare utilization and costs.

Diet as a Trigger or Therapy for Inflammatory Bowel Diseases

The most common question asked by patients with inflammatory bowel disease (IBD) is, "Doctor, what should I eat?" Findings from epidemiology studies have indicated that diets high in animal fat and low in fruits and vegetables are the most common pattern associated with an increased risk of IBD. Low levels of vitamin D also appear to be a risk factor for IBD. In murine models, diets high in fat, especially saturated animal fats, also increase inflammation, whereas supplementation with omega 3 long-chain fatty acids protect against intestinal inflammation. Unfortunately, omega 3 supplements have not been shown to decrease the risk of relapse in patients with Crohn's disease. Dietary intervention studies have shown that enteral therapy, with defined formula diets, helps children with Crohn's disease and reduces inflammation and dysbiosis. Although fiber supplements have not been shown definitively to benefit patients with IBD, soluble fiber is the best way to generate short-chain fatty acids such as butyrate, which has anti-inflammatory effects. Addition of vitamin D and curcumin has been shown to increase the efficacy of IBD therapy. There is compelling evidence from animal models that emulsifiers in processed foods increase risk for IBD. We discuss current knowledge about popular diets, including the specific carbohydrate diet and diet low in fermentable oligo-, di-, and monosaccharides and polyols. We present findings from clinical and basic science studies to help gastroenterologists navigate diet as it relates to the management of IBD.

Racial and Ethnic Minorities with Inflammatory Bowel Disease in the United States: A Systematic Review of Disease Characteristics and Differences

BACKGROUND

Inflammatory bowel disease (IBD) has predominantly affected whites, particularly Ashkenazi Jews. Over the last 2 decades, IBD has "emerged" in minorities. Differences in natural history and disease characteristics have been suggested. The objective of this systematic review is to summarize these differences in studies from the United States.

METHODS

A structured search was performed within the Medline database through PubMed, EMBASE, and Cochrane databases. Published studies of genetics, pathogenesis, prevalence or incidence, disease location and behavior, extraintestinal manifestations, disparities and access to care in patients with IBD who are of African American, Asian, and Hispanic descent living in the United States were eligible.

RESULTS

A total of 47 studies were included for African Americans (n = 20,054), Hispanics (n = 10,762), and Asians (n = 2668). The incidence and prevalence of IBD is increasing among minorities. There is less of a genetic influence in the pathogenesis of IBD among African Americans; however, novel variants have been identified. There is a predilection for pancolonic ulcerative colitis among Hispanics and Asians. Crohn's disease-related hospitalizations are increasing in Asians, whereas African Americans are more likely to use the emergency department. No major differences are seen in disease location and behavior, upper gastrointestinal tract, and perianal involvement and extraintestinal manifestations among races and ethnic groups. Medication utilization seems to be similar. Differences in surgery are likely explained by health insurance status.

CONCLUSIONS

Future prospective studies are needed to fully characterize disease characteristics and treatment response among minorities. With novel IBD therapies in the pipeline, enrollment in clinical trials should emphasize increased representation of all races and ethnic groups.

Considerations in Imaging Among Emergency Department Patients With Inflammatory Bowel Disease

Patients with inflammatory bowel disease who experience abdominal pain and gastrointestinal symptoms often seek care in the emergency department (ED). These patients commonly undergo abdominopelvic computed tomography (CT) as part of their evaluation, and the rate of imaging appears to be increasing without a corresponding increase in identification of clinically actionable findings or effect on disposition. Studies demonstrate that the yield of CT tends to be fairly high. Yet, because inflammatory bowel disease is often diagnosed at an early age, these patients are repeatedly imaged during their lifetime, a subset of whom accumulate high levels of ionizing radiation exposure, increasing their risk of cancer. This compounds an already increased risk of cancer in these patients because of inflammatory bowel disease alone. Lack of intimate knowledge of a patient's disease phenotype and disease progression contributes to uncertainty in distinguishing between an inflammatory exacerbation; a complication such as obstruction, abscess, perforation, fistula, or stricture; and a noninflammatory-bowel-disease-related condition. This uncertainty can lead to overuse of imaging with CT. Limited availability of and lack of awareness of alternate imaging modalities and strategies may prevent providers from pursuing strategies that avoid ionizing radiation. In this article, we review options for imaging inflammatory bowel disease patients in the ED and attempts undertaken to risk stratify these patients, and we discuss ways in which details of a patient's disease might guide imaging decisionmaking.

Serum vitamin D and colonic vitamin D receptor in inflammatory bowel disease

AIM: To determine serum vitamin D levels and colonic vitamin D receptor (VDR) expression in inflammatory bowel disease (IBD) and non-IBD patients and correlate these with histopathology.

METHODS: Puerto Rican IBD (n = 10) and non-IBD (n = 10) patients ≥ 21 years old scheduled for colonoscopy were recruited. Each patient completed a questionnaire and provided a serum sample and a colonic biopsy of normal-appearing mucosa. For IBD patients, an additional biopsy was collected from visually diseased mucosa. Serum vitamin D levels were measured by ultra-performance liquid chromatography and mass spectrometry. Hematoxylin and eosin stained tissue sections from colonic biopsies were classified histologically as normal or colitis (active/inactive), and scored for the degree of inflammation present (0-3, inactive/absent to severe). Tissue sections from colonic biopsies were also stained by immunohistochemistry for VDR, for which representative diagnostic areas were photographed and scored for staining intensity using a 4-point scale.

RESULTS: The IBD cohort was significantly younger (40.40 ± 5.27, P < 0.05) than the non-IBD cohort (56.70 ± 1.64) with a higher prevalence of vitamin D deficiency (40% vs 20%, respectively) and insufficiency (70% vs 50%, respectively). Histologic inflammation was significantly higher in visually diseased mucosa from IBD patients (1.95 ± 0.25) than in normal-appearing mucosa from control patients (0.25 ± 0.08, P < 0.01) and from IBD patients (0.65 ± 0.36, P < 0.05) and correlated inversely with VDR expression in visually diseased colonic tissue from IBD patients (r = -0.44, P < 0.05) and from IBD patients with Crohn’s disease (r = -0.69, P < 0.05), but not in normal-appearing colonic tissue from control patients or IBD patients. Control and IBD patient serum vitamin D levels correlated positively with VDR expression in normal colon from control and IBD patients (r = 0.38, P < 0.05) and with patient age (r = 0.54, P < 0.01).

CONCLUSION: Levels of serum vitamin D correlate positively with colonic VDR expression in visually normal mucosa whereas inflammation correlates negatively with colonic VDR expression in visually diseased mucosa in Puerto Rican patients.

Manifestations of inflammatory bowel disease in patients of Haitian and Cape Verdean descent

OBJECTIVE

Several studies have reported unique ethnic phenotypes of inflammatory bowel disease (IBD). An appreciation of disease manifestations in different populations may improve clinical outcomes. There are no studies examining IBD in patients of Haitian or Cape Verdean descent. We sought to define the IBD phenotype in these populations.

MATERIALS AND METHODS

This was a retrospective review comparing Haitian and Cape Verdean immigrant IBD patients to Caucasians, all receiving care at Boston Medical Center in Boston, Massachusetts, USA. The following variables were analyzed: family history, smoking history, vaccinations/cancer screening, age of diagnosis, disease duration, disease location, medication use, and complications.

RESULTS

Thirty-one Haitians and 21 Cape Verdeans were matched to Caucasian controls. Haitians (mean age 42 years) and Cape Verdeans (mean age 47 years) with Crohn's disease were diagnosed with IBD later than Caucasians (mean age 31 years, p = 0.04 and 0.02, respectively). Haitians with Crohn's were less likely to have a history of tobacco use compared to Caucasians (13% vs. 51%, p = 0.02). Cape Verdeans with Crohn's were less likely to have perianal involvement (0% vs. 50%, p = 0.01). Haitians with IBD were less likely to have ever used glucocorticoids (48% vs. 76%, p = 0.02). There was no difference in vaccination rates, cancer screening, or disease complications.

CONCLUSIONS

This study demonstrates differences in IBD presentation and disease course among Haitians and Cape Verdeans. Our results suggest a more mild disease in these ethnic groups. Future studies are needed to identify the influence of environmental factors.

Ethnic variations in the provision of biologic therapy for Crohn's disease: a Freedom of Information study

In this study, we investigate whether the provision of biologic therapy for Crohn's disease is equitable across South Asian and English groups in NHS Trusts, which serve areas with significant ethnic variation. Data were requested from 10 NHS Trusts using a Freedom of Information (FOI) approach. Details of numbers of patients by ethnicity treated with infliximab or adalumimab for Crohn's disease between 2010 and 2012 were requested. Using population-based estimates of disease prevalence and Census data on population structure, observed and expected numbers who should have received treatment were calculated. In three Trusts, the number of South Asian patients who received such treatment was significantly less than British/White patients. These were: Pennine Acute Hospitals NHS Trust covering Oldham and North Manchester, Barking, Havering & Redbridge University Hospitals NHS Trust and University Hospitals of Leicester NHS Trust. The study is limited by several factors: 1. The only data available on prevalence in both English and South Asian communities comes from Leicester and was published in 1993. More recent data suggests that the prevalence of Crohn's disease now approaches 150/10(5) compared to the 76/10(5) for English patients which was recorded in Leicester. However, the two subsequent studies on prevalence which were published in 2000 from the North of England and 2010 from Scotland do not provide a breakdown by ethnicity. 2. The data were collected by administrative staff using a variety of approaches to their Trust's data bases and so the techniques used in each Trust are not comparable. In addition, studies from elsewhere suggest that the quality of FOI data is affected by the motivation of staff who collect the data. 3. With the exception of Leicester, there was no quality check on the accuracy of the data. In Leicester, 139 patients were on a register of biologic therapy and this compared with 343 patients reported by the FOI request. However, the proportions of patients by type of treatment and by ethnicity were comparable in the two data sets. This suggests that the data on ethnic differences reported by the FOI study reflects real differences. Clearly, there are South Asian communities where patients with Crohn's disease appear not to receive appropriate treatment in the form of biologics, and the reasons behind this need further consideration and investigation. We need to develop robust methods of monitoring the provision of biologic therapy across ethnic groups and communities. It is unacceptable for there to be a difference based on such grounds.

Hispanics and inflammatory bowel disease

BACKGROUND

Historically, inflammatory bowel disease (IBD) was considered a disease, which predominately affects whites. As such, the majority of research in IBD has been conducted in this population. However, more research on this suggests that IBD affects other ethnic groups. Rapidly shifting demographics in the United States necessitates a better understanding of how IBD may affect Hispanics. We reviewed the current literature on IBD in Hispanics.

METHODS

A PubMed search was conducted using keywords inflammatory bowel disease, Ulcerative Colitis, Crohn's disease, Hispanics, Latinos, ethnicity, to identify existing literature with a focus on adult populations. Non-English language articles were excluded.

RESULTS

The existing data and literature on Hispanic patients with IBD remains sparse. Limited studies on prevalence suggest IBD may be more common in Hispanics in the United States compared with those in Latin America. Conflicting data exist as to whether Hispanics patients with IBD are more likely to have ulcerative colitis compared with Crohn's disease. One study explored difference in IBD between foreign-born and U.S.-born Hispanics and found that ulcerative colitis was more common only in foreign-born Hispanics, whereas within 1 generation, U.S.-born Hispanics resemble their non-Hispanic white counterparts about development of Crohn's disease. Such a rapid change in the proportion of ulcerative colitis and Crohn's disease points strongly to environmental factors driving the change in proportion of disease subtypes. Additionally, a trend towards less use of biologic and immunomodulators in Hispanics was noted in several studies.

CONCLUSIONS

Additional research is needed to better understand how diversity within the Hispanic population (U.S.-born and foreign-born) may be driving difference in disease manifestations. More investigations should focus on determining the cause of a potential disparity in the use of biologic and immunomodulators in Hispanics.

Epidemiology and risk factors for IBD

IBD, comprising Crohn's disease and ulcerative colitis, is a chronic immunologically mediated disease at the intersection of complex interactions between genetics, environment and gut microbiota. Established high-prevalence populations of IBD in North America and Europe experienced the steepest increase in incidence towards the second half of the twentieth century. Furthermore, populations previously considered 'low risk' (such as in Japan and India) are witnessing an increase in incidence. Potentially relevant environmental influences span the spectrum of life from mode of childbirth and early-life exposures (including breastfeeding and antibiotic exposure in infancy) to exposures later on in adulthood (including smoking, major life stressors, diet and lifestyle). Data support an association between smoking and Crohn's disease whereas smoking cessation, but not current smoking, is associated with an increased risk of ulcerative colitis. Dietary fibre (particularly fruits and vegetables), saturated fats, depression and impaired sleep, and low vitamin D levels have all been associated with incident IBD. Interventional studies assessing the effects of modifying these risk factors on natural history and patient outcomes are an important unmet need. In this Review, the changing epidemiology of IBD, mechanisms behind various environmental associations and interventional studies to modify risk factors and disease course are discussed.