ABSTRACT
ABSTRACT Scientific innovations in diagnostic methods are important drivers of cancer control and prevention. Noninvasive imaging of the epidermal growth factor receptor (EGFR) in head-and-neck squamous, cell carcinoma and colorectal cancer could be valuable to select patients for EGFR-targeted therapy, as well as to monitor the efficacy and occurrence of resistance to immunotherapy. In order to develop the first Brazilian radioimmunoconjugate for diagnosis, Cetuximab has been conjugated to p-SCN-Bn-DTPA chelator and radiolabeled with Indium-111. The conjugation methodology was optimized using different mAb:DTPA molar ratios, time was then reduced for immunoconjugate preparation, besides the protein recovery' percentage increased after purification (m = 83.8 ± 0.91 %). The stability of Cetuximab-DTPA at - 20 oC was evaluated for six months, and its integrity was greater than 90% (m =93.9 ± 1.5%, N = 24). The radioimmunoconjugate with specific activity of 185 MBq/mg showed radiochemical purity above 95% (m=96.8 ± 1.31 %, N = 15). We conclude that the radioimmunoconjugate 111In-DTPA-cetuximab is stable and may be applied to the diagnosis of EGFR-positive tumors.
Subject(s)
Colorectal Neoplasms/diagnosis , Immunoconjugates/analysis , Head and Neck Neoplasms/diagnosis , Neoplasms/diagnosis , Cetuximab/therapeutic useABSTRACT
A composição da placa aterosclerótica, em contrapartida ao grau de estenose arterial, parece ser o determinante crítico da vulnerabilidade e trombogenicidade da placa. O fluordesoxiglucose (FDG-18F), pode ser usado para obter imagensda atividade celular inflamatória de forma não invasiva através da tecnología PET. O objetivo principal do presente estudo foi averiguar a viabilidade da tecnologia FDG-18F PET na avaliação do processo inflamatório instalado nas placas ateroscleróticas, e, dessa forma, promover a distinção de placas ateroscleróticas através da relação entre acúmulo do radiofármaco e as características funcionais da lesão aterosclerótica. Estudo epidemiológico prospectivo, duplo cego randomizado, transversal foi realizado em cinco pacientes, seis controles e, os mesmos, foram submetidos ao exame diagnóstico FDG-18F PET/CT. Os valores de suv em artérias carótidas e veias jugulares do próprio paciente e o comparativo com o grupo controle foram correlacionados através de uma avaliação qualitativa do coeficiente de correlação de pearson. Através de um estudo descritivo comparativo inter-grupos na carótida direita observa-se que 64.9% da média dos valores de SUV corresponde aos pacientes em estudo. Na análise efetuada intra-grupo da carótida direita com a jugular direita dos pacientes em estudo, observou-se um valor médio de SUV 26.2% superior na artéria carótida. No grupo controle, a diferença entre os níveis médios de captação do FDG-18F foi inferior a 10%. Através da endarterectomia, foi possível realizar um estudo anátomo patológico e, dessa forma, identificar a presença de conteúdo inflamatórionas carótidas avaliadas, caracterizando assim placas instáveis. A tecnologia FDG-18F PET mostrou-se exequível favorecendo uma boa correlação histopatológica entre o processo inflamatório instalado nas placas ateroscleróticas e os níveis mensurados de SUV.
An ethological approach to the study of behavioral disorders provides key information on functionalaspects of behavior that characterize certain pathologies. The purpose of this study was to describe non-verbal behavioral units presented by a group of 14 women with social phobia (SP) and a control groupof 13 women during a clinical interview and to evaluate the possible differences between these twogroups. The 19 behavior units were selected with the index of concordance between the observers tauKendall = 0.795 (p = 0.000). People with SP supported the way they spoke with their hands and placedtheir hands on their legs, in comparison with the control group. People with SP nodded more often,touched their faces, pressed their lips, licked their lips and touched their hair more frequently than thecontrol group. The article suggests that a systematic evaluation of non-verbal behavior may be impor-tant in conducting a full evaluation of patients with SF in a clinical environment, and may contribute toevaluating the efficiency of the treatment.