2017
DOI: 10.1007/s10151-017-1670-4
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One-level step section histological analysis is insufficient to confirm complete pathological response after neoadjuvant chemoradiation for rectal cancer

Abstract: Histopathological analysis with 1-level step section is insufficient to determine complete tumor eradication. The 3-level sections methodology revealed residual tumor cells in patients initially classified as ypT0. Further studies with larger sample size are required to verify the clinical relevance of these residual tumor cells. Caution should continue to be applied to watch and wait strategies following nCRT.

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Cited by 4 publications
(4 citation statements)
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“…Some believe that a marked histological response to treatment indicates better survival, while others deny its role as a prognostic marker . Histologic changes in response to the nCMT are currently classified by TRG, which is has been associated as prognostic factor in some types of cancer . Since there are different TRG systems, to allow better reproducibility we evaluated the response based on the percentage of viable tumor cells and defined two response groups.…”
Section: Discussionmentioning
confidence: 99%
See 1 more Smart Citation
“…Some believe that a marked histological response to treatment indicates better survival, while others deny its role as a prognostic marker . Histologic changes in response to the nCMT are currently classified by TRG, which is has been associated as prognostic factor in some types of cancer . Since there are different TRG systems, to allow better reproducibility we evaluated the response based on the percentage of viable tumor cells and defined two response groups.…”
Section: Discussionmentioning
confidence: 99%
“…25,26 Histologic changes in response to the nCMT are currently classified by TRG, which is has been associated as prognostic factor in some types of cancer. 10,27 Since there are different TRG systems, 9 to allow better reproducibility we evaluated the response based on the percentage of viable tumor cells and defined two response groups. Major response occurred in 32.3% GC and pCR was achieved in two patients (3.2%).…”
Section: Discussionmentioning
confidence: 99%
“…Nestes casos, recomenda-se que cortes adicionais em três níveis sejam realizados para confirmar a resposta patológica completa. 53,55 No caso da presença de tumor residual, esse pode compreender desde aéreas extensas de tumor viável, até apenas pequenas células isoladas, ou aglomerados tumoraispodendo ser superficiais ou em camadas mais profundas. 6 A resposta patológica ao tratamento, conforme a oitava edição do TNM/AJCC, deve ser determinada pela quantidade de tumor residual viável em relação às áreas de fibrose/fibroinflamação dentro da lesão macroscópica.…”
Section: Avaliação Do Câncer Gástrico Pós-quimioterapiaunclassified
“…Embora devido ao número restrito de pacientes não tenha sido possível realizar análises mais detalhadas com subgrupos, é importante reconhecê-las para investigação futuras, pois em tumores como colorretal pós-QT algumas dessas características apresentam relação com a resposta local. 55 Complementarmente, para incrementar a avaliação do status dos LNs, examinou-se também os pacientes para a categoria ypN em relação a presença ou ausência de regressão histopatológica como determinante de resposta linfonodal, o que é mais confiável do que a definição de resposta baseada no downstaging linfonodal utilizando de referência inicial o estádio clínico por exames de imagem (cN+ para ypN0). 64 Ademais, essa pesquisa foi conduzida em um centro público de alto volume, especializado no tratamento do câncer.…”
Section: Limitações Do Estudo E Considerações Metodológicasunclassified