APC protein immunoexpression in colorectal adenoma and adenocarcinoma

dc.contributor.authorBourroul, Vivian Sati Oba
dc.contributor.authorBourroul, Guilherme Muniz
dc.contributor.authorToloi, Giovanna Canato
dc.contributor.authorPalma, Rogerio Tadeu
dc.contributor.authorOshima, Celina Tizuko Fujiyama [UNIFESP]
dc.contributor.authorGomes, Thiago Simao [UNIFESP]
dc.contributor.authorIhara, Silvia Saiuli Miki [UNIFESP]
dc.contributor.authorWaisberg, Jaques
dc.contributor.institutionHospital do Servidor Publico Estadual Service of Digestive System Surgery
dc.contributor.institutionHospital Estadual Mario Covas Service of Digestive System Surgery
dc.contributor.institutionFaculdade de Medicina do ABC
dc.contributor.institutionFaculdade de Medicina do ABC Service of Digestive System Surgery
dc.contributor.institutionUniversidade Federal de São Paulo (UNIFESP)
dc.contributor.institutionFaculdade de Medicina do ABC General and Digestive System Surgery
dc.date.accessioned2015-06-14T13:45:36Z
dc.date.available2015-06-14T13:45:36Z
dc.date.issued2013-09-01
dc.description.abstractBACKGROUND:activation of the Wnt pathway by mutated APC gene is considered the initial event in colorectal carcinogenesis. The identification of these mutations can improve the specific treatment of the adenocarcinoma.OBJECTIVE:detect and evaluate wild-type APC protein in tissue from colorectal adenoma, adenocarcinoma and adjacent mucosa.METHODS:42 patients that underwent surgery for adenocarcinoma and 53 patients with resected adenomas were studied. Tissue samples from the adenocarcinoma were obtained from the tumor and from adjacent non-neoplastic mucosa located 10 cm from the proximal margin of the tumor. Adenoma tissue was obtained from representative areas. Blocks of tissue microarray (TMA) were submitted to immunohistochemistry with anti-APC, with readings of positivity and intensity of immunostaining and the score of immune expression of APC protein was obtained.RESULTS:the APC protein immune expression score showed a significantly lower expression of APC protein in the adenoma when compared with the adenocarcinoma (p < 0.0001) and adjacent mucosa (p < 0.0001). The APC protein immune expression score in the colorectal mucosa and adjacent to the adenocarcinoma showed no significant difference (p = 0.24).CONCLUSIONS:the finding of decreased expression of APC protein in adenoma tissue may indicate that the mutated APC gene may contribute to the changes in the adenoma-carcinoma process of carcinogenesis sequence. The strong expression of protein APC in tissues from the carcinoma and adjacent mucosa suggests that in most patients in this series, the mutation of the APC gene did not participate in the oncogenesis mechanism.en
dc.description.abstractRACIONAL:a ativação da via Wnt pelo gene APC mutado é considerado evento inicial da carcinogênese colorretal. A identificação dessas mutações pode tornar o tratamento do adenocarcinoma mais específico.OBJETIVO:detectar e avaliar a proteína APC não mutada em tecidos de adenoma, adenocarcinoma e mucosa adjacente.MÉTODO:estudados 42 doentes operados de adenocarcinoma e 53 com adenomas ressecados. Tecidos de adenocarcinoma foram obtidas da neoplasia e da mucosa adjacente não neoplásica situadas a 10 cm da margem proximal do tumor. Tecidos do adenoma foram obtidas de área representativa. Blocos de tissue microarray (TMA) foram submetidos a imuno-histoquímica com anticorpo anti-APC. Avaliadas a positividade e intensidade da expressão e obtidos escores da imunoexpressão da proteína APC.RESULTADOS:o escore da imunoexpressão da proteína APC no adenoma foi significantemente menor do que no adenocarcinoma (p < 0,0001) e na mucosa adjacente (p < 0,0001). O escore da imunoexpressão da proteína APC na mucosa adjacente e no adenocarcinoma não mostraram diferença significante (p = 0,24).CONCLUSÕES:a menor expressão da proteína APC no adenoma pode indicar que o gene APC mutado participa das alterações do processo adenoma-carcinoma. A forte expressão da proteína APC no CCR e na mucosa adjacente sugerem que a mutação do gene APC não participou da oncogênese.pt
dc.description.affiliationHospital do Servidor Publico Estadual Service of Digestive System Surgery
dc.description.affiliationHospital Estadual Mario Covas Service of Digestive System Surgery
dc.description.affiliationFaculdade de Medicina do ABC
dc.description.affiliationFaculdade de Medicina do ABC Service of Digestive System Surgery
dc.description.affiliationUniversidade Federal de São Paulo (UNIFESP) Escola Paulista de Medicina Laboratory of Molecular Pathology
dc.description.affiliationUNIFESP-EPM Laboratory of Molecular Pathology
dc.description.affiliationFaculdade de Medicina do ABC General and Digestive System Surgery
dc.description.affiliationUnifespUNIFESP, EPM, Laboratory of Molecular Pathology
dc.description.affiliationUnifespUNIFESP, EPM Laboratory of Molecular Pathology
dc.description.sourceSciELO
dc.format.extent118-125
dc.identifierhttp://dx.doi.org/10.1016/j.jcol.2013.06.002
dc.identifier.citationJournal of Coloproctology (Rio de Janeiro). Sociedade Brasileira de Coloproctologia, v. 33, n. 3, p. 118-125, 2013.
dc.identifier.doi10.1016/j.jcol.2013.06.002
dc.identifier.fileS2237-93632013000300118.pdf
dc.identifier.issn2237-9363
dc.identifier.scieloS2237-93632013000300118
dc.identifier.urihttp://repositorio.unifesp.br/handle/11600/7920
dc.language.isoeng
dc.publisherSociedade Brasileira de Coloproctologia
dc.relation.ispartofJournal of Coloproctology (Rio de Janeiro)
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectColorectal neoplasmsen
dc.subjectCarcinomaen
dc.subjectAdenomaen
dc.subjectAPC Geneen
dc.subjectImmunohistochemistryen
dc.subjectBiological tumor markersen
dc.subjectNeoplasias colorretaispt
dc.subjectCarcinomapt
dc.subjectAdenomapt
dc.subjectGene APCpt
dc.subjectImunoistoquimicapt
dc.subjectMarcadores biologicos de tumorpt
dc.titleAPC protein immunoexpression in colorectal adenoma and adenocarcinomaen
dc.title.alternativeImunoexpressao da proteina APC nos tecidos de adenoma e de adenocarcinoma colorretaispt
dc.typeinfo:eu-repo/semantics/article
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