ABSTRACT Background: To evaluate the relationship between the ratio of affected lymph nodes (LNR) and clinical and anatomopathological variables in patients with rectal adenocarcinoma submitted or not to neoadjuvant chemoradiotherapy. Methods: The LNR was determined by dividing the number of compromised LNR by the total number of LNR dissected in the surgical specimen. Patients were divided into two groups: with QRT and without QRT. In each group, the relationship between LNR and the following variables was evaluated: degree of cell differentiation, depth of invasion in the rectal wall, angiolymphatic /perineural invasion, degree of tumor regression and occurrence of metastases. The LNR was evaluated in patients with more than 1, LNR (LNR >12) or less (LNR<12) in the surgical specimen with overall survival (OS) and disease-free survival (DFS). The results were expressed as the mean with the respective standard deviation. Qualitative variables were analyzed using Fisher’s exact test, while quantitative variables were analyzed using the Kruskal -Wallis and Mann-Whitney tests. The significance level was 5%. Results: We evaluated 282 patients with QRT and 114 without QRT, between 1995-2011. In the QRT Group, LNR showed a significant association with mucinous tumors (P=0.007) and degree of tumor regression (P=0.003). In both groups, LNR was associated with poorly differentiated tumors (P=0.001, P=0.02), presence of angiolymphatic invasion (P<0.0001 and P=0.01), perineural (P=0.0007, P=0.02), degree of rectal wall invasion (T3>T2; P<0.0001, P=0.02); Compromised LNR (P<0.0001, P<0.01), metastases (P<0.0001, P<0.01). In patients with QRT, LNR<12 was associated with DFS (5.889; 95%CI1.935-19.687; P=0.018) and LNR>12 with DFS and OS (17.984; 95%CI5.931-54.351; P<0.001 and 10.286; 95%CI 2.654-39.854; P=0.007, respectively). Conclusion: LNR was associated with histological aspects of poor prognosis, regardless of the use of QRT. In the occurrence of less than 12 evaluated LNR, the LNR was associated only with the DFS. Background chemoradiotherapy Methods groups group differentiation 1 >12 LNR12 (LNR<12 (OS diseasefree disease free . (DFS) deviation Fishers Fisher s test Wallis MannWhitney Mann Whitney tests 5 5% Results 28 11 19952011. 19952011 1995 2011. 2011 1995-2011 Group P=0.007 P0007 P 0 007 (P=0.007 P=0.003. P0003 P=0.003 003 (P=0.003) P=0.001, P0001 001 (P=0.001 P=0.02, P002 P=0.02 , 02 P=0.02) P<0.0001 P00001 0001 (P<0.000 P=0.01, P001 P=0.01 01 P=0.01) P=0.0007, P00007 0007 (P=0.0007 T3>T2 T3T2 TT T3 T2 T (T3>T2 P<0.01, P<0.01 P<0.01) P<0.01. LNR<1 5.889 5889 889 (5.889 95%CI1.93519.687 95CI193519687 CI 95%CI1.935 19.687 95 CI1 935 19 687 95%CI1.935-19.687 P=0.018 P0018 018 LNR>1 17.984 17984 17 984 (17.984 95%CI5.93154.351 95CI593154351 95%CI5.931 54.351 CI5 931 54 351 95%CI5.931-54.351 P<0.00 10.286 10286 10 286 95CI 2.65439.854 265439854 2.654 39.854 2 654 39 854 2.654-39.854 respectively. respectively respectively) Conclusion prognosis >1 LNR1 (LNR<1 (DFS 1995201 199 201 1995-201 P=0.00 P000 00 (P=0.00 (P=0.003 P=0.001 P00 P=0.0 P<0.000 P0000 000 (P<0.00 P=0.0007 (P=0.000 T3>T T3T (T3>T P<0.0 LNR< 5.88 588 88 (5.88 93519 95%CI1.93519.68 95CI19351968 95CI1935 95%CI1.93 19687 19.68 9 93 68 95%CI1.935-19.68 LNR> 17.98 1798 98 (17.98 93154 95%CI5.93154.35 95CI59315435 95CI5931 95%CI5.93 54351 54.35 35 95%CI5.931-54.35 10.28 1028 65439 2.65439.85 26543985 2654 2.65 39854 39.85 65 3 85 2.654-39.85 > (LNR< 199520 20 1995-20 (P=0.0 P0 P=0. (P<0.0 P=0.000 P<0. 5.8 58 8 (5.8 9351 95%CI1.93519.6 95CI1935196 95CI193 95%CI1.9 1968 19.6 6 95%CI1.935-19.6 17.9 179 (17.9 9315 95%CI5.93154.3 95CI5931543 95CI593 95%CI5.9 5435 54.3 95%CI5.931-54.3 10.2 102 6543 2.65439.8 2654398 265 2.6 3985 39.8 2.654-39.8 19952 1995-2 (P=0. P=0 (P<0. P<0 5. (5. 95%CI1.93519. 95CI193519 95CI19 95%CI1. 196 19. 95%CI1.935-19. 17. (17. 95%CI5.93154. 95CI593154 95CI59 95%CI5. 543 54. 95%CI5.931-54. 10. 2.65439. 265439 26 2. 398 39. 2.654-39. 1995- (P=0 P= (P<0 P< (5 95%CI1.93519 95CI19351 95CI1 95%CI1 95%CI1.935-19 (17 95%CI5.93154 95CI59315 95CI5 95%CI5 95%CI5.931-54 2.65439 26543 2.654-39 (P= (P< ( 95%CI1.9351 95%CI1.935-1 (1 95%CI5.9315 95%CI5.931-5 2.6543 2.654-3 (P 95%CI1.935- 95%CI5.931- 2.654-

RESUMO Contexto: Avaliar a relação entre a razão de linfonodos (RLA) acometidos e variáveis clínicas e anatomopatológicas em portadores de adenocarcinoma de reto submetidos ou não à quimiorradioterapia neoadjuvante. Métodos: A RLA foi determinada dividindo-se o número total de linfonodos (LFNs) dissecados no espécime cirúrgico pelo número de comprometidos. Os doentes foram divididos em dois grupos: com QRT e sem QRT. Em cada grupo foi avaliada a relação entre a RLA e as seguintes variáveis: grau de diferenciação celular, profundidade de invasão na parede retal, invasão angiolinfática/perineural, grau de regressão tumoral e ocorrência de metástases. Avaliou-se a RLA em pacientes com mais do que 12 LFNs (RLA>12) ou menos (RLA<12) na peça cirúrgica com a sobrevida global (SG) e sobrevida livre de doença (SLD). Os resultados foram expressos pela média com o respectivo desvio padrão. As variáveis qualitativas foram analisadas utilizando-se o teste exato de Fisher, enquanto as quantitativas pelos testes de Kruskal-Wallis e Mann-Whitney. O nível de significância foi de 5%. Resultados: Foram avaliados 282 pacientes com QRT e 114 sem QRT, entre 1995-2011. No Grupo QRT, RLA mostrou associação significativa com os tumores mucinosos (P=0,007) e grau de regressão tumoral (P=0,003). Nos dois grupos, a RLA associou-se com tumores pouco diferenciados (P=0,001 e P=0,02), presença de invasão angiolinfática (P<0,0001 e P=0,01), perineural (P=0,0007 e P=0,02), grau de invasão da parede retal (T3>T2; P<0,0001 e P=0,02); LFNs comprometidos (P<0,0001 e P<0,01), metástases (P<0,0001 e P<0,01). Nos pacientes com QRT, a RLA <12 associou-se com a SLD (5,889; IC95%1,935-19,687; P=0,018) e a RLA >12 com SLD e SG (17,984; IC95%5,931-54,351; P<0,001 e 10,286; IC95%2,654-39,854; P=0,007, respectivamente). Conclusão: A RLA associou-se a aspectos histológicos de mau prognóstico, independentemente do emprego de QRT. Na ocorrência de menos de 12 LFNs avaliados, a RLA associou-se apenas com a SLD. Contexto (RLA neoadjuvante Métodos dividindose dividindo se (LFNs grupos celular angiolinfáticaperineural angiolinfática/perineural Avaliouse Avaliou 1 RLA>12 RLA12 (RLA>12 RLA<12 (RLA<12 (SG . (SLD) padrão utilizandose utilizando Fisher KruskalWallis Kruskal Wallis MannWhitney. MannWhitney Mann Whitney. Whitney Mann-Whitney 5 5% Resultados 28 11 19952011. 19952011 1995 2011. 2011 1995-2011 P=0,007 P0007 P 0 007 (P=0,007 P=0,003. P0003 P=0,003 003 (P=0,003) associouse associou P=0,001 P0001 001 (P=0,00 P=0,02, P002 P=0,02 , 02 P=0,02) P00001 0001 (P<0,000 P=0,01, P001 P=0,01 01 P=0,01) P=0,0007 P00007 0007 (P=0,000 T3>T2 T3T2 TT T3 T2 T (T3>T2 P<0,000 P<0,01, P<0,01 P<0,01) P<0,01. <1 5,889 5889 889 (5,889 IC95%1,93519,687 IC95193519687 IC IC95%1,935 19,687 IC95 935 19 687 IC95%1,935-19,687 P=0,018 P0018 018 >1 17,984 17984 17 984 (17,984 IC95%5,93154,351 IC95593154351 IC95%5,931 54,351 931 54 351 IC95%5,931-54,351 P<0,00 10,286 10286 10 286 IC95%2,65439,854 IC95265439854 IC95%2,654 39,854 2 654 39 854 IC95%2,654-39,854 respectivamente. respectivamente respectivamente) Conclusão prognóstico RLA>1 RLA1 (RLA>1 RLA<1 (RLA<1 (SLD 1995201 199 201 1995-201 P=0,00 P000 00 (P=0,003 (P=0,0 P00 P=0,0 P0000 000 (P<0,00 P=0,000 T3>T T3T (T3>T P<0,0 < 5,88 588 88 (5,88 93519 IC95%1,93519,68 IC9519351968 IC951935 IC95%1,93 19687 19,68 IC9 93 68 IC95%1,935-19,68 > 17,98 1798 98 (17,98 93154 IC95%5,93154,35 IC9559315435 IC955931 IC95%5,93 54351 54,35 35 IC95%5,931-54,35 10,28 1028 65439 IC95%2,65439,85 IC9526543985 IC952654 IC95%2,65 39854 39,85 65 3 85 IC95%2,654-39,85 RLA> (RLA> RLA< (RLA< 199520 20 1995-20 (P=0, P0 P=0, (P<0,0 P<0, 5,8 58 8 (5,8 9351 IC95%1,93519,6 IC951935196 IC95193 IC95%1,9 1968 19,6 9 6 IC95%1,935-19,6 17,9 179 (17,9 9315 IC95%5,93154,3 IC955931543 IC95593 IC95%5,9 5435 54,3 IC95%5,931-54,3 10,2 102 6543 IC95%2,65439,8 IC952654398 IC95265 IC95%2,6 3985 39,8 IC95%2,654-39,8 19952 1995-2 (P=0 P=0 (P<0, P<0 5, (5, IC95%1,93519, IC95193519 IC9519 IC95%1, 196 19, IC95%1,935-19, 17, (17, IC95%5,93154, IC95593154 IC9559 IC95%5, 543 54, IC95%5,931-54, 10, IC95%2,65439, IC95265439 IC9526 IC95%2, 398 39, IC95%2,654-39, 1995- (P= P= (P<0 P< (5 IC95%1,93519 IC9519351 IC951 IC95%1 IC95%1,935-19 (17 IC95%5,93154 IC9559315 IC955 IC95%5 IC95%5,931-54 IC95%2,65439 IC9526543 IC952 IC95%2 IC95%2,654-39 (P (P< ( IC95%1,9351 IC95% IC95%1,935-1 (1 IC95%5,9315 IC95%5,931-5 IC95%2,6543 IC95%2,654-3 IC95%1,935- IC95%5,931- IC95%2,654-

RESUMO O objetivo do presente manuscrito foi fazer uma revisão histórica do desenvolvimento e das mais importantes contribuições em relação à Síndrome de Lynch, desde sua primeira descrição há mais de um século atrás. Em 1895, o reputado patologista Dr. Aldred Scott Warthin ficou intrigado com a história familiar de uma costureira local, chamada Pauline Gross. De acordo com a sua previsão, ela morreria precocemente devido a um câncer, o que realmente aconteceu (do útero). Historicamente, sua família foi designada como Família “G”, caracterizando um grupo reconhecido como a maior e mais longa árvore genealógica relacionada ao câncer familiar jamais estudada. Warthin concluiu que os membros dessa família tinham susceptibilidade genética para câncer, e ainda hoje são considerados a primeira família com Síndrome de Lynch reportada na literatura. Entretanto, naquela época a comunidade médica oncológica não era receptiva à associação entre hereditariedade e câncer, a despeito da descrição de outras famílias com heredogramas similares. Infelizmente, esse fato histórico permaneceu esquecido até que outro investigador inaugurou uma nova era para a melhor compreensão da agregação familiar do câncer. Após diversas descrições dessa mesma agregação de casos de câncer em outras famílias, essa condição inicialmente denominada Síndrome de Câncer Familial foi mudada para o epônimo Síndrome de Lynch. Esse foi um reconhecimento ao extenso e dedicado trabalho desenvolvido pelo Dr. Henry Lynch na descrição de diversas características da doença e seus esforços para estabelecer as recomendações corretas para o seu diagnóstico e tratamento. Embora o futuro anuncie que ainda teremos um longo caminho a percorrer para a completa compreensão da Síndrome de Lynch, as contribuições extraordinárias da intuição de Pauline, da perseverança de Warthin e da consistência do trabalho de Lynch nunca devem ser esquecidas por àqueles que já se beneficiaram, bem como os que ainda irão se beneficiar de todo esse conhecimento. atrás 1895 Dr local Gross previsão útero. útero . útero) Historicamente G, G , “G” estudada literatura Entretanto similares Infelizmente tratamento beneficiaram conhecimento 189 “G 18 1

ABSTRACT The present manuscript aimed to review the historical development and most important contributions regarding Lynch Syndrome since its first description, more than a century ago. In 1895, a reputed pathologist from Michigan University, Dr. Aldred Scott Warthin, got intrigued by the family history of a local seamstress called Pauline Gross. According to her prevision, she would present an early death due to cancer, which actually happened (from the uterus). Historically, her family was designated “Family G”, comprising a group recognized as the longest and most detailed cancer genealogy that has ever been studied. Warthin concluded that its members had genetic susceptibility for cancer, and they are, nowadays, considered the first reported Lynch Syndrome family. At that time, however, the medical cancer community was far less receptive to the association between heredity and cancer, despite the description of other families with similar heredograms. Unfortunately, this historical fact remained somewhat dormant until another investigator inaugurated a new era in the understanding of family cancer clusters. After reports and studies from this family and many others, the condition initially called Cancer Family Syndrome was changed to the eponym Lynch Syndrome. This was a recognition of the extensive and dedicated work developed by Dr. Henry Lynch in describing various characteristics of the disease, and his efforts to establish the correct recommendations for its diagnosis and treatment. Although the future announces there is still far to go for a complete understanding of Lynch Syndrome, the remarkable contributions of Pauline’s intuition, Warthin’s perseverance, and Lynch’s work consistency must never be forgotten by those who already have or will still benefit from this knowledge. ago 1895 University Dr Gross prevision uterus. uterus . uterus) Historically G, G , G” studied are nowadays time however heredograms Unfortunately clusters others disease treatment Paulines s intuition Warthins perseverance Lynchs knowledge 189 18 1

Abstract Many technical propositions have been incorporated to the surgical management of hemorrhoidal disease during the recent decades. Besides that, escisional techniques are still considered the best option to control symptoms and reduce recurrence. The present manuscript aims to propose a technical modification of the classical closed hemorrhoidectomy described by Ferguson in America. Our proposition is to perform two sutures to close the wound resulting from hemorrhoidal resection. The first one consists of an anchored continuous suture using a very thin (4–0 or 5–0) monofilamentar thread coming from inside to the outside skin. After tying the stitch, a simple continuous second suture is made over the previous suture only for mucosal approximation, from outside to inside. Finally, the stich that initiated the first suture is tied up to the stich used for the second suture, and the knot remains located above the dentate line, not to disturb the patient. The confection of two layers aims to reinforce the closing of the wound and avoid dehiscence. The idea is that this modification influences postoperative outcomes by reducing symptoms such as wound discharge and pain, and thus improving healing and esthetics. In a next step research, a comparison with the classical technique may bring new insights to this issue. decades recurrence America resection 4–0 40 4 0 (4– 5–0 50 5 skin stitch approximation Finally line patient dehiscence pain esthetics research issue 4– (4 5– (

ABSTRACT Purpose: To evaluate the tissue content of neutral and acidic mucins, sulfomucins and sialomucins in colonic glands devoid of intestinal transit after enemas containing sucralfate and n-acetylcysteine alone or in combination. Methods: Sixty-four rats underwent intestinal transit bypass. A colonic segment was collected to compose the white group (without intervention). After derivation, the animals were divided into two groups according to whether enemas were performed daily for two or four weeks. Each group was subdivided into four subgroups according to the substance used: control group: saline 0.9%; sucralfate group (SCF): SCF 2 g/kg/day; n-acetylcysteine group (NAC): NAC 100 mg/kg/day; and SCF+NAC group: SCF 2 g/kg/day + NAC 100 mg/kg/day.Neutral and acidic mucins were stained by periodic acid-Schiff and alcian-blue techniques, respectively. The distinction between sulfomucins and sialomucin was made by the high alcian-blue iron diamine technique. The content of mucins in the colonic glands was measured by computerized morphometry. The inflammatory score was assessed using a validated scale. The results between the groups were compared by the Mann-Whitney’s test, while the variation according to time by the Kruskal-Wallis’ test (Dunn’s post-test). A significance level of 5% was adopted. Results: There was reduction in the inflammatory score regardless of the application of isolated or associated substances. Intervention with SCF+NAC increased the content of all mucin subtypes regardless of intervention time. Conclusions: The application of SCF+NAC reduced the inflammatory process of the colonic mucosa and increased the content of different types of mucins in the colonic glands of segments excluded from fecal transit. Purpose nacetylcysteine n acetylcysteine combination Methods Sixtyfour Sixty bypass without intervention. . intervention) derivation weeks used 0.9% 09 0 9 (SCF) gkgday g kg day (NAC) 10 mg/kg/day mgkgday mg SCFNAC mgkgdayNeutral Neutral acidSchiff acid Schiff alcianblue alcian blue techniques respectively technique morphometry scale MannWhitneys Mann Whitney s KruskalWallis Kruskal Wallis Kruskal-Wallis Dunns Dunn posttest. posttest post post-test) 5 adopted Results substances Conclusions 0.9 (SCF (NAC 1 post-test 0.

ABSTRACT BACKGROUND: Colorectal cancer (CRC) is the most common malignancy of the gastrointestinal tract and the third most common type of cancer worldwide. The COVID-19 pandemic, during the years 2020 and 2022, increased the difficulties in offering adequate early diagnosis and treatment to CRC patients worldwide. During this period, it was only possible to treat patients who evolved with complications, mainly intestinal obstruction and perforation. AIMS: To assess the impact of the COVID-19 pandemic on the treatment of patients with CRC. METHODS: A review of data from a total of 112 patients undergoing emergency surgical treatment due to complications of CRC was carried out. Of these, 78 patients underwent emergency surgery during the COVID-19 pandemic (2020/2021), and 34 were treated before the pandemic (2018/2019). Ethnic aspects, clinical symptoms, laboratory tests, histopathological variables, intra and postoperative complications, and 90-day postoperative follow-up were compared between the two groups. RESULTS: Between the years 2018 and 2019, 79.4% (27/34) of patients had intestinal obstruction, while 20.6% (7/34) had intestinal perforation. During the period of the COVID-19 pandemic (2020/2021), 1.3% (1/78) of patients underwent surgery due to gastrointestinal bleeding, 6.4% (5/78) due to intestinal perforation, and 92.3% (72/78) due to intestinal obstruction. No statistically significant differences were recorded between the two groups in ethnic aspects, laboratory tests, type of complications, number of lymph nodes resected, compromised lymph nodes, TNM staging, pre or intraoperative complications, length of stay, readmission, or mortality rate. When considering postoperative tumor staging, among patients operated on in 2018/2019, 44.1% were classified as stage III and 38.2% as stage IV, while during the pandemic period, 28.2% presented stage III and 51.3% stage IV, also without a statistically significant difference between the two periods. Patients operated on during the pandemic had higher rates of vascular, lymphatic and perineural invasion. CONCLUSIONS: The COVID-19 pandemic increased the rate of complications related to CRC when comparing patients treated before and during the pandemic. Furthermore, it had a negative impact on histopathological variables, causing worse oncological prognoses in patients undergoing emergency surgery. BACKGROUND (CRC worldwide COVID19 COVID 19 COVID-1 202 2022 perforation AIMS METHODS 11 out these 7 2020/2021, 20202021 2020/2021 , 2021 (2020/2021) 3 2018/2019. 20182019 2018/2019 . 2019 (2018/2019) aspects symptoms tests variables 90day day 90 followup follow up RESULTS 201 794 79 4 79.4 27/34 2734 27 (27/34 206 20 6 20.6 7/34 734 (7/34 13 1 1.3 1/78 178 (1/78 bleeding 64 6.4 5/78 578 5 (5/78 923 92 92.3 72/78 7278 72 (72/78 resected staging stay readmission 441 44 44.1 382 38 2 38.2 IV 282 28 28.2 513 51 51.3 periods vascular invasion CONCLUSIONS Furthermore COVID1 COVID- 2020202 2020/202 (2020/2021 2018201 2018/201 (2018/2019 9 79. 27/3 273 (27/3 20. 7/3 73 (7/3 1. 1/7 17 (1/7 6. 5/7 57 (5/7 92. 72/7 727 (72/7 44. 38. 28. 51. 202020 2020/20 (2020/202 201820 2018/20 (2018/201 27/ (27/ 7/ (7/ 1/ (1/ 5/ (5/ 72/ (72/ 20202 2020/2 (2020/20 20182 2018/2 (2018/20 (27 (7 (1 (5 (72 2020/ (2020/2 2018/ (2018/2 (2 ( (2020/ (2018/ (2020 (2018 (202 (201 (20

RESUMO RACIONAL: O câncer colorretal (CCR) é a doença maligna mais comum do trato gastrointestinal sendo o terceiro tipo de câncer mais comum em todo o mundo. A pandemia de COVID-19 durante os anos de 2020 e 2022 aumentou as dificuldades em se oferecer diagnóstico e tratamento precoce adequado aos pacientes com CCR em todo o mundo. Nesse período, só foi possível tratar os pacientes que evoluíram com complicações representadas, principalmente, pela obstrução e perfuração intestinal. OBJETIVOS: Avaliar o impacto da pandemia de COVID-19 no tratamento de pacientes com CCR. MÉTODOS: Foi realizada uma revisão dos dados de um total de 112 pacientes submetidos ao tratamento cirúrgico de urgência devido complicações do CCR. Destes, 78 pacientes foram submetidos a cirurgia de emergência durante o período da pandemia de COVID-19 (2020/2021), e 34 pacientes foram operados no período anterior à pandemia (2018/2019). Aspectos étnicos, sintomas clínicos, exames laboratoriais, variáveis histopatológicas, complicações intra e pós-operatórias e acompanhamento pós-operatório de 90 dias foram analisados comparando os dois grupos. RESULTADOS: Entre os anos 2018 e 2019, 79,4% (27/34) dos pacientes apresentaram obstrução intestinal enquanto 20,6% (7/34) perfuração intestinal. Durante o período da pandemia de COVID-19 (2020/2021) 1,3% (1/78) dos pacientes foram operados por hemorragia digestiva baixa, 6,4% (5/78) por perfuração intestinal e 92,3% (72/78) por obstrução intestinal. Não foram registradas diferenças estatisticamente significativas entre os dois grupos nos aspectos étnicos, exames laboratoriais, tipo de complicações, número de linfonodos ressecados, linfonodos comprometidos, estadiamento TNM, complicações pré ou intraoperatórias, tempo de internação, readmissão e taxa de mortalidade. Ao considerar o estadiamento tumoral pós-operatório, entre os pacientes operados em 2018/19, 44,1% foram classificados como estágio III e 38,2% como estágio IV, enquanto no período pandêmico, 28,2% apresentaram estágio III e 51,3% estágio IV, também sem diferença estatisticamente significativa entre os dois períodos. Doentes operados durante a pandemia apresentaram maiores índices de invasão vascular, linfática e perineural. CONCLUSÕES: A pandemia de COVID-19 aumentou as taxas de complicações relacionadas ao CCR, comparando pacientes tratados antes e durante a pandemia. Além disso, teve impacto negativo nas variáveis histopatológicas, causando piores prognósticos oncológicos em pacientes submetidos a cirurgias de emergência. RACIONAL (CCR mundo COVID19 COVID 19 COVID-1 202 representadas principalmente OBJETIVOS MÉTODOS 11 Destes 7 2020/2021, 20202021 2020/2021 , 2021 3 2018/2019. 20182019 2018/2019 . 2019 (2018/2019) étnicos clínicos laboratoriais histopatológicas pósoperatórias pós operatórias pósoperatório operatório 9 RESULTADOS 201 794 79 4 79,4 27/34 2734 27 (27/34 206 20 6 20,6 7/34 734 (7/34 (2020/2021 13 1 1,3 1/78 178 (1/78 baixa 64 6,4 5/78 578 5 (5/78 923 92 92,3 72/78 7278 72 (72/78 ressecados comprometidos TNM intraoperatórias internação mortalidade pósoperatório, operatório, 201819 2018/19 441 44 44,1 382 38 2 38,2 IV pandêmico 282 28 28,2 513 51 51,3 períodos vascular perineural CONCLUSÕES disso COVID1 COVID- 2020202 2020/202 2018201 2018/201 (2018/2019 79, 27/3 273 (27/3 20, 7/3 73 (7/3 (2020/202 1, 1/7 17 (1/7 6, 5/7 57 (5/7 92, 72/7 727 (72/7 20181 2018/1 44, 38, 28, 51, 202020 2020/20 201820 2018/20 (2018/201 27/ (27/ 7/ (7/ (2020/20 1/ (1/ 5/ (5/ 72/ (72/ 2018/ 20202 2020/2 20182 2018/2 (2018/20 (27 (7 (2020/2 (1 (5 (72 2020/ (2018/2 (2 ( (2020/ (2018/ (2020 (2018 (202 (201 (20

Abstract Objective: Familial Adenomatous Polyposis is a complex hereditary disease that exposes the carrier to a great risk of Colorectal Cancer (CRC). After prophylactic surgery, intra-abdominal desmoid tumors are known to be one the most important cause of death. Therefore, recognition of increased-risk patients and modification of operative strategy may be crucial. Aim: The objective of this study was to estimate the desmoid tumor risk in relation to various surgical and clinical variables. Methods: Patients who had undergone polyposis since 1958 were included in the study. After exclusion criteria were met, those who had developed desmoid tumors were selected to undergo further evaluation. Results: The study revealed that the risk of developing desmoid tumors was associated with various factors such as sex ratio, colectomy, and reoperations. On the other hand, the type of surgery, family history, and surgical approach did not affect the risk of developing desmoid tumors. The data collected from 146 polyposis patients revealed that 16% had desmoid polyps. The sex ratio was 7:1, and the median age at colectomy was 28.6 years. Family history, multiple abdominal operations, and reoperations were some of the characteristics that were common in desmoid patients. Conclusion: Recognition of clinical (female sex) and surgical (timing of surgery and previous reoperations) data as unfavorable variables associated with greater risk may be useful during the decision-making process. Objective CRC. CRC . (CRC) intraabdominal intra death Therefore increasedrisk increased crucial Aim Methods 195 met evaluation Results hand history 14 16 polyps 71, 71 7 1, 1 7:1 286 28 6 28. years operations Conclusion female timing decisionmaking decision making process (CRC 19 7: 2

RESUMO Contexto: O tratamento do câncer retal distal pode ser acompanhado por distúrbios evacuatórios de etiologia multifatorial. A quimiorradioterapia neoadjuvante faz parte do tratamento padrão para pacientes com câncer retal extraperitoneal localmente avançado. A avaliação da função anorretal após neoadjuvância de longa duração em pacientes com câncer de reto extraperitoneal tem sido pouco estudada. Objetivo: O objetivo do presente estudo foi avaliar os efeitos da neoadjuvância na função anorretal e na incontinência em pacientes com câncer retal extraperitoneal. Métodos: Pacientes com adenocarcinoma de reto candidatos à terapia neoadjuvante foram submetidos a avaliação funcional por manometria anorretal e avaliação do grau de incontinência fecal pelo escore de Jorge-Wexner, pré e oito semanas após a neoadjuvância. Os parâmetros manométricos avaliados foram pressão anal média de repouso, pressão anal de contração voluntária máxima e pressão anal média de contração voluntária. Todos os pacientes foram submetidos ao mesmo protocolo de neoadjuvância baseado na aplicação de fluoropirimidina (5-FU) na dosagem de 350 mg/m2 associada ao ácido fólico na dosagem de 20 mg/m2, por via intravenosa, na primeira e última semana de tratamento, concomitantemente à radioterapia conformacional com dose total de 50,4Gy, dividida em 28 frações diárias de 1,8Gy. Para análise estatística das variáveis quantitativas com distribuição normal, foram calculados a média, desvio padrão, mediana e intervalo interquartil. Para comparação de duas amostras relacionadas (antes e oito semanas após a neoadjuvância, foi utilizado o teste não paramétrico de Wilcoxon. Resultados: Quarenta e oito pacientes com câncer retal foram incluídos no estudo, com média de idade de 62,8 (39-81) anos, sendo 36 (75%) do sexo masculino. O uso de neoadjuvância foi associado à diminuição dos valores de média de pressão de repouso (55,0 mmHg vs 39,1 mmHg, P<0,05) e média de pressão de contração voluntária (161,9 mmHg vs 141,9 mmHg, P<0,05) sem alterar os valores de pressão de contração voluntária máxima ((185,5 mmHg vs 173 mmHg, P=0.05)). Não houve piora do escore de incontinência oito semanas após o uso da quimiorradioterapia neoadjuvante (3,0 vs 3,3; P>0,05). Conclusão: A neoadjuvância associou-se à redução dos valores de média de pressão de repouso e média dos valores contração voluntária. Não houve alteração nos valores de contração voluntária máxima, bem como no grau de continência fecal pelo escore de Jorge-Wexner.

ABSTRACT Background: The treatment of distal rectal cancer may be accompanied by evacuation disorders of multifactorial etiology. Neoadjuvant chemoradiotherapy (NCRT) is part of the standard treatment for patients with locally advanced extraperitoneal rectal cancer. The assessment of anorectal function after long-term NCRT in patients with cancer of the extraperitoneal rectum has been poorly evaluated. Objective: The aim of the present study was to evaluate the effects of NCRT on anorectal function and continence in patients with extraperitoneal rectal cancer. Methods: Rectal adenocarcinoma patients undergoing neoadjuvant therapy were submitted to functional evaluation by anorectal manometry and the degree of fecal incontinence using the Jorge-Wexner score, before and eight weeks after NCRT. The manometric parameters evaluated were mean resting anal pressure (ARp), maximum voluntary contraction anal pressure (MaxSp) and average voluntary contraction anal pressure (ASp). All patients underwent the same NCRT protocol based on the application of fluoropyrimidine (5-FU) at a dosage of 350 mg/m2 associated with folic acid at a dosage of 20 mg/m2, intravenously, in the first and last week of treatment, concomitantly with conformational radiotherapy with a total dose of 50.4Gy, divided into 28 daily fractions of 1.8Gy. For statistical analysis of the quantitative variables with normal distribution, the mean, standard deviation, median and interquartile range were calculated. For comparison of two related samples (before and eight weeks after NCRT), Wilcoxon’s non-parametric test was used. Results: Forty-eight patients with rectal cancer were included in the study, with a mean age of 62.8 (39-81) years, 36 (75%) of whom were male. The use of NCRT was associated with a decrease in the values of ARp (55.0 mmHg vs 39.1 mmHg, P<0.05) and ASp (161.9 mmHg vs 141.9 mmHg, P<0.05) without changing MaxSp values (185,5 mmHg vs 173 mmHg, P=0.05). There was no worsening of the incontinence score eight weeks after the use of NCRT (3.0 vs 3.3; P>0.05). Conclusion: NCRT was associated with a reduction in the values of ARp and the ASp. There was no change in MaxSp, as well as in the degree of fecal continence by the Jorge-Wexner score.

RESUMO RACIONAL: Desde sua introdução, a hemorroidopexia por grampeamento tem sido cada vez mais indicada no manuseio da doença hemorroidária. OBJETIVOS: Nosso objetivo primário foi avaliar a incidência de doença recidivada que requeira tratamento cirúrgico. Numa análise secundária, também comparamos dor, complicações e satisfação do paciente após uma operação ajustada a cada caso. MÉTODOS: Foram revistos retrospectivamente 196 pacientes (103 homens e 93 mulheres) com idade média de 47,9 anos (17–78) submetidos a hemorroidopexia mecânica isoladamente (STG; n=65) ou cirurgia combinada (CSG; n=131, hemorroidopexia por grampeamento com ressecção). RESULTADOS: Complicações foram detectadas 11 (5,6%) pacientes (4,6% para STG vs. 6,1% para CSG; p=0,95). Ao mesmo tempo, recidiva de sintomas (13,8% vs. 8,4%; p=034), reoperações por complicações (3,1% vs. 3,0%; p=1,0) ou por recidiva (6,1 vs. 4,6%; p=1,0) não foram diferentes entre os dois grupos. Pacientes com grau IV foram mais comumente manuseados com grampeamento e ressecção simultâneos (63% vs. 49,5%), mas nenhum deles apresentou recidiva ou necessitou reoperação. O escore médio de dor na primeira semana foi maior no grupo CSG (0,8 vs. 1,7). Após seguimento de 24,9 meses, os índices de satisfação foram similares (8,6; p=0,8). CONCLUSÕES: Sintomas de recidiva foram observados em 10%, requerendo cirurgia em aproximadamente metade dos doentes. Embora a associação de técnicas aumente os escores de dor, um procedimento sob medida baseado em critérios ampliados de indicação e técnicas combinadas parece ser uma alternativa efetiva e segura, com menor recidiva em pacientes portadores de doença hemorroidária mais avançada. Os escores de satisfação após hemorroidopexia são altos.

ABSTRACT BACKGROUND: Since its introduction, stapled hemorrhoidopexy has been increasingly indicated in the management of hemorrhoidal disease. AIM: Our primary end point was to evaluate the incidence of recurrent disease requiring another surgical intervention. On a secondary analysis, we also compared pain, complications, and patient's satisfaction after a tailored surgery. METHODS: We retrospectively reviewed 196 patients (103 males and 93 females) with a median age of 47.9 years (range, 17–78) who were undergoing stapled hemorrhoidopexy alone (STG; n=65) or combined surgery (CSG; n=131, stapled hemorrhoidopexy associated with resection). RESULTS: Complications were detected in 11 (5.6%) patients (4.6% for STG vs. 6.1% for CSG; p=0.95). At the same time, symptoms recurrence (13.8% vs. 8.4%; p=034), reoperation rate for complications (3.1% vs. 3.0%; p=1.0), and reoperation rate for recurrence (6.1% vs. 4.6%; p=1.0) were not different among groups. Grade IV patients were more commonly managed with simultaneous stapling and resection (63% vs. 49.5%), but none of them presented symptoms recurrence nor need reoperation due to recurrence. Median pain score during the first week was higher in CSG patients (0.8 vs. 1.7). After a follow-up of 24.9 months, satisfaction scores were similar (8.6; p=0.8). CONCLUSION: Recurrent symptoms were observed in 10% of patients, requiring surgery in approximately half of them. Even though the association of techniques may raise pain scores, a tailored approach based on amplified indication criteria and combined techniques seems to be an effective and safe alternative, with decreased relapse rates in patients suffering from more advanced hemorrhoidal disease. Satisfaction scores after hemorrhoidopexy are high.

ABSTRACT BACKGROUND: Plexiform neurofibromas represent a common neoplasia of type 1 neurofibromatosis in which neurofibromas arise from multiple nerves involving connective tissue and skin and rarely affect the colon and rectum. Co-occurrence of plexiform neurofibromas, neuroendocrine tumors with primary involvement of the rectum, and medullary thyroid carcinoma in patients with neurofibromatosis type 1 is a previously undescribed condition. The aim of this manuscript was to present a case of primary plexiform neurofibroma and neuroendocrine tumors of the upper rectum in a patient with neurofibromatosis type 1 whose genetic sequencing found a novel mutation in the neurofibromatosis type 1 gene and to review the literature. CASE REPORT: A 49-year-old woman with a familial history of neurofibromatosis type 1 complained of abdominal cramps for 6 months. She had previously been submitted for a total thyroidectomy due to medullary thyroid carcinoma. She was submitted to a colonoscopy, which identified a submucosa lesion located in the upper rectum. The patient was referred for a laparoscopic rectosigmoidectomy, and the histopathological study of the surgical specimen identified two different tumors. An immunohistochemical panel was done for histopathological confirmation of the etiology of both lesions. The results of the panel showed intense immunoexpression of S100 protein in the largest and superficial lesion, as well as positivity for chromogranin and synaptophysin in the minor and deep lesion confirming the diagnosis of rectal plexiform neurofibromas concomitant with neuroendocrine tumors. The proliferative activity rate using Ki-67 antibodies showed that both tumors had a low rate of mitotic activity (<1%). Genetic sequence panel identified an undescribed mutation in the neurofibromatosis type 1 gene (deletion, exons 2–30). The patient’s postoperative evolution was uneventful, and she remains well, without recurrence, 3 years after surgery. CONCLUSION: The co-occurrence of medullary thyroid carcinoma, plexiform neurofibromas, and neuroendocrine tumors of the rectum in patients with neurofibromatosis type 1 is an exceptional and undescribed possibility, whose diagnosis can be confirmed by the immunohistochemical staining and genetic panel. BACKGROUND Cooccurrence Co occurrence condition literature REPORT 49yearold yearold 49 year old months colonoscopy rectosigmoidectomy lesions S S10 Ki67 Ki 67 Ki-6 <1%. <1% . (<1%) deletion, deletion (deletion 2–30. 230 2–30 2 30 2–30) s uneventful recurrence surgery CONCLUSION cooccurrence co possibility 4 S1 Ki6 Ki- <1 (<1% 23 2–3 < (<1 2– (< (

RESUMO RACIONAL: Os neurofibromas plexiformes representam uma neoplasia frequente na neurofibromatose tipo 1 onde os neurofibromas surgem de múltiplos nervos envolvendo, também, o tecido conjuntivo e a pele raramente acometendo o cólon e o reto. A co-ocorrência de neurofibromas plexiformes, tumores neuroendócrinos, com envolvimento primário do reto, e carcinoma medular de tireoide em pacientes com neurofibromatose tipo 1 é uma condição ainda não descrita. O objetivo deste manuscrito é descrever um caso de neurofibromas plexiformes e tumores neuroendócrinos primários do reto superior, em paciente com neurofibromatose tipo 1, cujo sequenciamento genético identificou uma nova mutação no gene neurofibromatose tipo 1 e revisar a literatura sobre o tema. DESCRIÇÃO DO CASO: Mulher de 49 anos, com história familiar de neurofibromatose tipo 1 queixava-se de cólicas abdominais há seis meses. Tinha sido previamente submetida a tireoidectomia total por carcinoma medular de tireoide. Foi submetida a colonoscopia, que identificou lesão submucosa localizada no reto superior. A doente foi encaminhada para retossigmoidectomia laparoscópica, cujo estudo histopatológico do espécime cirúrgico identificou dois tumores distintos. Realizou-se painel imuno-histoquímico para confirmação histopatológica da etiologia de ambas as lesões. O resultado do painel mostrou intensa imunoexpressão da proteína S-100 da lesão superficial e de maior tamanho,e positividade para cromogranina e somatofisina da lesão mais profunda e de menores dimensões confirmando o diagnóstico de neurofibromas plexiformes retal e tumores neuroendócrinos. O índice de atividade proliferativa utilizando o anticorpo ant-Ki-67 mostrou que ambos os tumores apresentavam baixa índice mitótico (<1%). O painel genético identificou mutação no gene neurofibromatose tipo 1 (deleção, exons 2–30) ainda não descrita. A doente apresentou evolução pós-operatória sem intercorrências, permanecendo bem, sem recorrência, três anos após a cirurgia. CONCLUSÕES: A co-ocorrência de carcinoma medular de tireoide, neurofibromas plexiformes e tumores neuroendócrinos do reto em pacientes com neurofibromatose tipo 1 é uma possibilidade excepcional e ainda não descrita, cujo diagnóstico pode ser confirmado pela coloração imuno-histoquímica e painel genético. RACIONAL envolvendo também coocorrência co ocorrência descrita superior tema CASO 4 queixavase queixava se meses colonoscopia laparoscópica distintos Realizouse Realizou imunohistoquímico imuno histoquímico lesões S100 S 100 S-10 tamanhoe tamanho antKi67 antKi ant Ki 67 ant-Ki-6 <1%. <1% . (<1%) deleção, deleção (deleção 2–30 230 2 30 pósoperatória pós operatória intercorrências bem recorrência cirurgia CONCLUSÕES imunohistoquímica histoquímica S10 10 S-1 antKi6 6 ant-Ki- <1 (<1% 2–3 23 3 S1 S- ant-Ki < (<1 2– (< (

Abstract The doppler-guided transanal hemorrhoidal dearterialization technique associated with mucopexy is a noninvasive surgical option used to treat hemorrhoidal disease (HD). Objective To compare and analyze the results using a variation of the doppler-guided transanal hemorrhoidal dearterialization technique with the technique of selective hemorrhoidal dearterialization with high mucopexy in the treatment of HD. Method A total of 292 patients who underwent surgical treatment for grade II, III and IV HD from March 2012 to December 2017 were studied. From this total, 110 (37.6%) patients underwent a conventional doppler-guided transanal hemorrhoidal dearterialization with mucopexy (CD), and 182 (62.3%) underwent selective hemorrhoidal dearterialization with highmucopexy (SHeLF). In the group of patients undergoing CD, 4 patients (3.64%) had grade II HD, 82 (74.55%) grade III, and 24 (21.82%) grade IV. In the group submitted to SHeLF, 18 (9.89%) patients had grade II HD, 86 (47.25%) had grade III, and 65 (35.71%) had grade IV. The same surgeon operated all patients under spinal anesthesia. In patients undergoing CD, six arterial branches have been dearterialized, while in patients undergoing SHeLF, the hemorrhoidary nipples submitted to a dearterialization were selected (from 1 to 5) by intraoperative evaluation followed by high rectal mucopexy. In the postoperative period, the following parameters were evaluated: pain, tenesmus, bleeding, and recurrence. Moderate results to severe pain was a postoperative complaint reported by 13 (11.82%) patients undergoing CD, and by 19 (10.44%) undergoing SHeLF. Intense tenesmus was reported by 26 (23.64%) patients undergoing CD and by 7 (3.85%) undergoing SHeLF. Three patients (2.73%) undergoing CD and 1 (0.55%) undergoing SHeLF evolved with postoperative bleeding. One patient (0.55%) in the group undergoing CD required surgical review of hemostasis. Six patients (5.45%) who underwent CD and 8 (4.39%) who underwent SHeLF were reoperated due to disease recurrence. Conclusion Comparing statistics, patients undergoing the SHeLF technique have less postoperative pain, tenesmus and postoperative bleeding when compared with CD.

ABSTRACT Purpose Quantify the tissue content of metalloproteinase-9 (MMP-9) and collagen in colic mucosa with and without intestinal transit after infliximab administration in rats subjected to Hartmann’s surgery. Methods Twenty-two rats underwent colon diversion by Hartmann’s surgery. Animals were maintained with intestinal bypass for 12 weeks to induce development of diversion colitis (DC). Afterwards, animals were divided into three groups: first group received subcutaneous application of saline solution (SS) 0.9%, while the remaining two groups received infliximab subcutaneously at doses of 5 or 10 mg·kg–1·week–1 for five consecutive weeks. After the intervention, animals were sacrificed, removing the segments with and without intestinal transit. Diversion colitis was diagnosed by histological study, and its intensity was determined by a validated inflammatory scale. Tissue expression of MMP-9 was assessed byimmunohistochemistry, while total collagen was assessed by histochemistry. Tissue content of both was measuredby computerized morphometry. Results Colon segments without intestinal transit had a higher degree of inflammation, which improved in animals treated with infliximab. Collagen content was always lower in those without intestinal transit. There was an increase in the collagen content in the colon without transit in animals treated with infliximab, primarily at a dose of 10 mg·kg–1·week–1. There was an increase in the content of MMP-9 in the colon without fecal transit, and a reduction was observed in animals treated with infliximab, regardless of the dose used. Conclusions Application of infliximab reduces inflammation, increases the total collagen content and decreases the content of MMP-9 in the colon without intestinal transit.

ABSTRACT Purpose: To evaluate the effects of sucralfate enemas in tissue contents of E-cadherin and ?-catenin in an experimental diversion colitis. Methods: Thirty-six male Wistar rats were submitted to a proximal colostomy and a distal mucous fistula. They were allocated into three groups: first group received daily saline enemas (2 mL/day) and the two other groups daily enemas with sucralfate at dosage of 1 or 2 g/kg/day, respectively. Six animals of each group were euthanized after two weeks and six animals after four weeks. The inflammation of the excluded mucosa was evaluated by histological analysis. The oxidative damage was quantified by measurement of malondialdehyde tissue levels. The expression of E-cadherin and ?-catenin was identified by immunohistochemistry, and its contents were quantified by computer-assisted image analysis. Results: Sucralfate enemas reduced inflammation in animals subjected to treatment with 2 g/kg/day by four weeks, and the levels of oxidative damage in mucosa without fecal stream irrespective of concentration and time of intervention. E-cadherin and ?-catenin content increased in segments without fecal stream in those animals subjected to treatment with sucralfate. Conclusions: Sucralfate reduces the inflammation and oxidative stress and increases the tissue content of E-cadherin and ?-catenin in colonic mucosa devoid to the fecal stream.

RESUMO - RACIONAL: O estresse oxidativo é um dos principais mecanismos associados à ruptura dos mecanismos de defesa que formam a barreira epitelial cólica e reduz o conteúdo tecidual das proteínas claudina-3 e ocludina principais constituintes das junções de oclusão intercelulares. O sucralfato, possui atividade antioxidante e tem sido usado para tratar diferentes formas de colite. OBJETIVO: Mensurar o conteúdo tecidual de claudina-3 e ocludina da mucosa do cólon sem trânsito fecal, submetido à intervenção com sucralfato. MÉTODO: Trinta e seis ratos foram submetidos à colostomia do cólon esquerdo e fístula mucosa distal. Os animais foram divididos em dois grupos de acordo com a eutanásia ser realizada duas ou quatro semanas após a intervenção. Cada grupo foi dividido em três subgrupos de acordo com o tipo de intervenção realizada diariamente: solução salina isolada; sucralfato a 1 g/kg/dia ou sucralfato a 2g/kg/dia. A colite foi diagnosticada por análise histológica adotando escala de validação prévia. A expressão tecidual de ambas as proteínas foi identificada por imunoistoquímica. O conteúdo das proteínas foi quantificado por análise de imagem assistida por computador. RESULTADOS: O escore inflamatório foi maior nos segmentos cólicos sem trânsito fecal e os enemas com sucralfato reduziram o escore inflamatório nesses segmentos, principalmente nos animais submetidos à intervenção com sucralfato em maior concentração e por período mais longo de intervenção. Houve aumento no conteúdo tecidual das proteínas claudina-3 e ocludina, relacionado com a concentração de sucralfato. O conteúdo tecidual de ambas as proteínas não se modificou com a duração da intervenção. CONCLUSÃO: Enemas com sucralfato reduzem a inflamação e aumentam o conteúdo tecidual de claudina-3 e ocludina na mucosa cólica sem trânsito intestinal.

ABSTRACT - BACKGROUND: Oxidative stress is one of the main mechanisms associated with the rupture of the defense mechanisms of the colonic epithelial barrier; it reduces the tissue content of the claudin-3 and occludin proteins, which are the main constituents of intercellular tight junctions. Sucralfate (SCF) has antioxidant activity and has been used to treat different forms of colitis. AIM: This study aimed to measure the tissue claudin-3 and occludin content of the colon mucosa without fecal transit, subjected to intervention with SCF. METHODS: Thirty-six rats were subjected to left colon colostomy and distal mucous fistula. They were divided into two groups according to euthanasia that was performed 2 or 4 weeks after the intervention. Each group was divided into three subgroups according to the enema applied daily: saline alone, SCF at 1 g/kg/day, or SCF at 2 g/kg/day. Colitis was diagnosed by the histological analysis adopting the previous validate scale. The tissue expression of both proteins was identified by immunohistochemical technique. The content of proteins was quantified by computer-assisted image analysis. RESULTS: The inflammatory score was high in colonic segments without fecal transit, and enemas with SCF reduced the inflammatory score in these segments, mainly in those animals submitted to intervention with SCF in greater concentration and for a longer period of intervention. There was an increase in tissue content of claudin-3 and occludin, related to SCF concentration. The tissue content of both proteins was not related to the intervention time. CONCLUSION: Enemas with SCF reduced the inflammation and increased the tissue content of claudin-3 and occludin in colonic mucosa without fecal stream.

RESUMO - RACIONAL: A etiopatogenia da colite por desuso (DC) ainda não foi totalmente elucidada. As principais teorias consideram que a doença pode estar relacionada ao aumento de bactérias anaeróbias, falta de suprimento de ácidos graxos de cadeia curta (AGCC) e distúrbios imunológicos que se desenvolvem em segmentos colorretais desprovidos de trânsito fecal. OBJETIVO: Verificar se a aplicação de infliximabe modifica o conteúdo tecidual das proteínas E-caderina e claudina-3 no epitélio cólico de ratos sem trânsito intestinal. MÉTODOS: Vinte dois ratos foram submetidos a derivação do trânsito intestinal pelo procedimento de Hartmann. Eles permaneceram com o ostoma por 12 semanas para permitir o desenvolvimento da colite de exclusão. Em seguida, foram divididos em três grupos experimentais: seis animais receberam 2,0 ml de solução salina/semana, oito infliximabe na dose de 5 mg/Kg/semana e, os demais, infliximabe na dose de 10 mg/Kg/semana por 5 semanas consecutivas. Em seguida, os animais foram eutanasiados e os segmentos cólicos com e sem trânsito intestinal foram removidos. A colite por desuso foi diagnosticada pelas alterações histológicas definidas por uma escala previamente validada. Expressão tecidual de E-caderina e claudina-3 foi avaliada por imuno-histoquímica, e o conteúdo tecidual de ambas as proteínas foi quantificado por análise de imagem assistida por computador. RESULTADOS: Segmentos cólicos exclusos de trânsito fecal apresentaram maior grau de inflamação do que os expostos ao trânsito fecal. Inflamação foi menor nos animais tratados com infliximabe, independente da dose utilizada. Níveis de E-caderina e claudina-3 estavam reduzidos no cólon excluso. O tratamento com infliximabe aumentou os níveis das proteínas em segmentos do cólon sem trânsito intestinal, principalmente nos animais que receberam a dose de 10mg/kg/semana. CONCLUSÃO: Infliximabe reduz inflamação nos segmentos do cólon excluso e aumenta o conteúdo tecidual de E-caderina e claudina-3, especialmente na concentração de 10mg/kg/semana.

ABSTRACT - BACKGROUND: The etiopathogenesis of disuse colitis (DC) has not yet been fully elucidated. The main theories consider that the disease may be related to an increase in anaerobic bacteria, the lack of short-chain fatty acid (SCFA) supply, and immunological disorders that develop in the colorectal segments devoid of fecal transit. AIM: The aim of this study was to verify whether the application of infliximab modifies the tissue content of E-cadherin and claudin-3 proteins in colonic epithelium of rats devoid of intestinal transit. METHODS: A total of 22 rats underwent intestinal transit bypass using Hartmann’s procedure. They remained with the shunt for 12 weeks to allow the development of DC. Later, they were divided into three experimental groups: six animals received 2.0 mL saline solution/week, eight received infliximab at a dose of 5 mg/kg/week, and eight received infliximab at a dose of 10 mg/kg/week for 5 consecutive weeks. At the end of this period, the animals were euthanized, and the colonic segments with and without intestinal transit were removed. DC was diagnosed based on the histological changes defined by a previously validated scale. The tissue expression of E-cadherin and claudin-3 was assessed by immunohistochemistry, and the tissue content of both proteins was quantified by computer-aided image analysis. RESULTS: The colonic segments excluded from fecal transit showed a higher degree of inflammation than those exposed to fecal transit. The degree of inflammation was lower in animals treated with infliximab, regardless of the dose used. The levels of E-cadherin and claudin-3 were reduced in the excluded colon. Treating animals with infliximab increased the levels of both proteins in the colonic segments without intestinal transit, especially in animals receiving a dose of 10 mg/kg/week. CONCLUSION: Infliximab therapy reduces inflammation in the colonic segments excluded from intestinal transit and increases the tissue content of E-cadherin and claudin-3 proteins, especially when used at a concentration of 10 mg/kg/week.