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http://hdl.handle.net/1843/55178
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DC Field | Value | Language |
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dc.creator | Theara C.fagundes | pt_BR |
dc.creator | Marcelo Mamede | pt_BR |
dc.creator | Arnoldo Mafra | pt_BR |
dc.creator | Rodrigo g. Silva | pt_BR |
dc.creator | Ana c. g. Castro | pt_BR |
dc.creator | Luciana c. Silva | pt_BR |
dc.creator | Priscilla t. Aguiar | pt_BR |
dc.creator | Josiane a. Silva | pt_BR |
dc.creator | Eduardo Paulino Júnior | pt_BR |
dc.creator | Alexei m. Machado | pt_BR |
dc.date.accessioned | 2023-06-20T20:03:08Z | - |
dc.date.available | 2023-06-20T20:03:08Z | - |
dc.date.issued | 2017-07-17 | - |
dc.citation.volume | 64 | pt_BR |
dc.citation.issue | 2 | pt_BR |
dc.citation.spage | 119 | pt_BR |
dc.citation.epage | 126 | pt_BR |
dc.identifier.doi | https://doi.org/10.1590/1806-9282.64.02.119 | pt_BR |
dc.identifier.issn | 18069282 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/1843/55178 | - |
dc.description.resumo | Introduction: The standard treatment for locally advanced rectal cancer (RC) consists of neoadjuvant chemoradiation followed by radical surgery. Regardless the extensive use of SUV max in 18F-FDG PET tumor uptake as representation of tumor glycolytic consumption, there is a trend to apply metabolic volume instead. Thus, the aim of the present study was to evaluate a noninvasive method for tumor segmentation using the 18F-FDG PET imaging in order to predict response to neoadjuvant chemoradiation therapy in patients with rectal cancer. Method: The sample consisted of stage II and III rectal cancer patients undergoing 18F-FDG PET/CT examination before and eight weeks after neoadjuvant therapy. An individualized tumor segmentation methodology was applied to generate tumor volumes (SUV2SD) and compare with standard SUVmax and fixed threshold (SUV40%, SUV50% and SUV60%) pre- and post-therapy. Therapeutic response was assessed in the resected specimens using Dworak’s protocol recommendations. Several variables were generated and compared with the histopathological results. Results: Seventeen (17) patients were included and analyzed. Significant differences were observed between responders (Dworak 3 and 4) and non-responders for SUVmax-2 (p<0.01), SUV2SD-2 (p<0.05), SUV40%-2 (p<0.05), SUV50%-2 (p<0.05) and SUV60%-2 (p<0.05). ROC analyses showed significant areas under the curve (p<0.01) for the proposed methodology with sensitivity and specificity varying from 60% to 83% and 73% to 82%, respectively. Conclusion: The present study confirmed the predictive power of the variables using a noninvasive individualized methodology for tumor segmentation based on 18F-FDG PET/CT imaging for response evaluation in patients with rectal cancer after neoadjuvant chemoradiation therapy. | pt_BR |
dc.format.mimetype | pt_BR | |
dc.language | eng | pt_BR |
dc.publisher | Universidade Federal de Minas Gerais | pt_BR |
dc.publisher.country | Brasil | pt_BR |
dc.publisher.department | MED - DEPARTAMENTO DE ANATOMIA E IMAGEM | pt_BR |
dc.publisher.department | MED - DEPARTAMENTO DE ANATOMIA PATOLÓGICA E MEDICINA LEGAL | pt_BR |
dc.publisher.initials | UFMG | pt_BR |
dc.relation.ispartof | Revista da Associação Médica Brasileira | - |
dc.rights | Acesso Aberto | pt_BR |
dc.subject | Rectal Neoplasms | pt_BR |
dc.subject | Neoadjuvant Therapy | pt_BR |
dc.subject | 18F-FDG | pt_BR |
dc.subject | PET/CT | pt_BR |
dc.subject.other | Neoplasias Retais | pt_BR |
dc.subject.other | Terapia Neoadjuvante | pt_BR |
dc.subject.other | Fluordesoxiglucose F18 | pt_BR |
dc.subject.other | Tomografia por Emissão de Pósitrons combinada à Tomografia Computadorizada | pt_BR |
dc.title | Individualized threshold for tumor segmentation in 18F-FDG PET/CT imaging: the key for response evaluation of neoadjuvant chemoradiation therapy in patients with rectal cancer? | pt_BR |
dc.type | Artigo de Periódico | pt_BR |
dc.url.externa | https://www.scielo.br/j/ramb/a/ZxzXM5kmVRNzgzzSkXSL9BL/?lang=en | pt_BR |
dc.identifier.orcid | https://orcid.org/0000-0001-6157-6511 | pt_BR |
Appears in Collections: | Artigo de Periódico |
Files in This Item:
File | Description | Size | Format | |
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Individualized threshold for tumor pdfa.pdf | 326.22 kB | Adobe PDF | View/Open |
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