RESUMEN
BACKGROUND: The term inflammatory bowel disease-unclassified (IBDU) is used when an individual has chronic colitis but cannot be sub-typed into ulcerative colitis (UC) or Crohn's disease (CD) on the basis of the clinical, endoscopic, imaging and histopathological features. On follow-up a proportion of patients with IBDU are re-classified as CD or UC. There has been considerable variability in the frequency and reclassification rates of pediatric IBDU in published literature. METHODS: PubMed and Scopus and were searched for publications related to Pediatric Inflammatory Bowel Disease (PIBD) published between Jan,2014 and July,2021. Two reviewers independently searched and selected studies reporting the frequency of IBDU and/or their re-classification. The pooled prevalence was expressed as proportion and 95%CI. Meta-analysis was performed using the inverse variance heterogeneity model. RESULTS: A total of 2750 studies were identified through a systematic search of which 27 studies were included in this systematic review. The overall pooled frequency of IBDU (n=16064) was found to be 7.1% (95%CI 5.8-8.5%). There was no variation in IBDU frequency by geographical location. Seven studies (n=5880) were included in the IBDU re-classification analysis. Overall, 50% (95%CI 41-60%) children with IBDU were re-classified on follow-up. Amongst these 32.7% (95% 21-44%) were re-classified to UC and 17% (95%CI 12-22%) were re-classified to CD. CONCLUSION: IBDU comprises 7.1% of PIBD at initial diagnosis. Half of these children are re-classified into UC or CD on follow-up with a higher likelihood of re-classification to UC as compared to CD.
Asunto(s)
Colitis Ulcerosa , Colitis , Enfermedad de Crohn , Enfermedades Inflamatorias del Intestino , Niño , Humanos , Enfermedades Inflamatorias del Intestino/epidemiología , Colitis Ulcerosa/epidemiología , Enfermedad de Crohn/epidemiología , Enfermedad de Crohn/diagnóstico , PrevalenciaRESUMEN
ABSTRACT Background: The term inflammatory bowel disease-unclassified (IBDU) is used when an individual has chronic colitis but cannot be sub-typed into ulcerative colitis (UC) or Crohn's disease (CD) on the basis of the clinical, endoscopic, imaging and histopathological features. On follow-up a proportion of patients with IBDU are re-classified as CD or UC. There has been considerable variability in the frequency and reclassification rates of pediatric IBDU in published literature. Methods: PubMed and Scopus and were searched for publications related to Pediatric Inflammatory Bowel Disease (PIBD) published between Jan,2014 and July,2021. Two reviewers independently searched and selected studies reporting the frequency of IBDU and/or their re-classification. The pooled prevalence was expressed as proportion and 95%CI. Meta-analysis was performed using the inverse variance heterogeneity model. Results: A total of 2750 studies were identified through a systematic search of which 27 studies were included in this systematic review. The overall pooled frequency of IBDU (n=16064) was found to be 7.1% (95%CI 5.8-8.5%). There was no variation in IBDU frequency by geographical location. Seven studies (n=5880) were included in the IBDU re-classification analysis. Overall, 50% (95%CI 41-60%) children with IBDU were re-classified on follow-up. Amongst these 32.7% (95% 21-44%) were re-classified to UC and 17% (95%CI 12-22%) were re-classified to CD. Conclusion: IBDU comprises 7.1% of PIBD at initial diagnosis. Half of these children are re-classified into UC or CD on follow-up with a higher likelihood of re-classification to UC as compared to CD.
RESUMO Contexto: O termo doença inflamatória intestinal não classificada (DIINC) é usado quando um indivíduo tem colite crônica, mas não pode ser sub tipificado em colite ulcerativa (UC) ou doença de Crohn (DC) com base nas características clínicas, endoscópicas, de imagem e histopatológicas. No acompanhamento, uma proporção de pacientes com DIINC são reclassificadas como DC ou UC. Houve considerável variabilidade nas taxas de frequência e reclassificação de DIINC pediátrico na literatura publicada. Métodos: Foram procuradas publicações no PubMed e Scopus relacionadas à doença inflamatória pediátrica intestinal publicadas entre janeiro de 2014 e julho de 2021. Dois revisores pesquisaram e selecionaram estudos independentemente relatando a frequência da DIINC e/ou sua reclassificação. A prevalência agrupada foi expressa em proporção e para IC95%. A meta-análise foi realizada utilizando o modelo de heterogeneidade de variância inversa. Resultados: Foram identificados 2.750 estudos por meio de uma busca sistemática, dos quais 27 estudos foram incluídos nesta revisão sistemática. A frequência total agrupada da DIINC (n=16064) foi de 7,1% (IC95% 5,8-8,5%). Não houve variação na frequência da DIINC por localização geográfica. Sete estudos (n=5880) foram incluídos na análise de reclassificação da DIINC. No geral, 50% (IC95% 41-60%) foram reclassificadas no seguimento. Entre esses 32,7% (95% 21-44%) foram reclassificados para UC e 17% (IC95%12-22%) foram reclassificados para DC. Conclusão: DIINC compreende 7,1% da doença inflamatória pediátrica intestinal no diagnóstico inicial. Metade dessas crianças são reclassificados em UC ou DC no seguimento com maior probabilidade de reclassificação para UC em comparação com o DC.
Asunto(s)
Colangitis Esclerosante , Enfermedades Inflamatorias del Intestino , Niño , Colangitis Esclerosante/complicaciones , Colangitis Esclerosante/diagnóstico , Colangitis Esclerosante/terapia , Diagnóstico Precoz , Humanos , Enfermedades Inflamatorias del Intestino/complicaciones , Enfermedades Inflamatorias del Intestino/diagnóstico , Enfermedades Inflamatorias del Intestino/terapia , HígadoRESUMEN
INTRODUCTION AND AIM: HAVCR1 protein is the cellular receptor for hepatitis A virus (HAV). Genetic polymorphism in this gene may alter the outcome of HAV infection. In a previous study, a 6-amino acid insertion (157insMTTTVP) in HAVCR1 gene was associated with more severe disease. We decided to investigate this association further. MATERIAL AND METHODS: We sequenced exon 4 of the HAVCR1 gene in patients with clinical hepatitis A attending our institution, and a group of healthy controls in a disease-endemic setting in India. Frequencies of different haplotypes of a genomic region with two overlapping insertion-deletion polymorphisms (indels; rs141023871 and rs139041445) were compared between patients and controls, as well as between patients with and without a severe form of disease (liver failure). RESULTS: The gene had three haplotypes in the region of interest - a short form, an intermediate-form with a 5-amino acid 157insMTTVP insertion and a long-form with a 6-amino acid 157insMTTTVP insertion. The allele frequency (29/150 [19%] vs. 43/146 [29%]; p = ns) and haplotype frequency (29/75 [39%] vs. 39/73 [53%]; p = ns) of the 157insMTTTVP variant were similar in hepatitis A patients and healthy controls (30%). Further, the allele frequency (12/58 [21%] vs. 17/92 [18%]; p = ns) and haplotype frequency (12/29 [41%] vs.17/46 [37%]; p = ns) of the longest variant were also similar in patients with severe and mild disease. DISCUSSION: In the study population, the 157insMTTTVP variant of HAVCR1 gene was not associated with more severe outcome of HAV infection. Further studies in other populations around the world are needed to assess the relation of this genetic variation with disease outcome.