p53 and Ki-67 in Barrett's carcinoma: is there any value to predict recurrence after circumferential endoscopic mucosal resection? / p53 e Ki-67 no carcinoma do esôfago de Barrett: algum valor na predição da recurrência após mucosectomia endoscópica circunferencial?

BACKGROUND: There are situations in which the specimens obtained after endoscopic mucosal resection of superficial adenocarcinoma arising from Barrett's esophagus are not adequate for histopathological assessment of the margins. In these cases, immunohistochemistry might be an useful tool for predicting cancer recurrence. AIM: To evaluate the value of p53 and Ki-67 immunohistochemistry in predicting the cancer recurrence in patients with Barrett's esophagus-related cancer referred to circumferential endoscopic mucosal resection. METHODS: Mucosectomy specimens from 41 patients were analyzed. All endoscopic biopsies prior to endoscopic mucosal resection presented high-grade dysplasia and cancer was detected in 23 of them. Positive reactions were considered the intense coloration in the nuclei of at least 90 percent of the cells in each high-power magnification field, and immunostaining could be classified as superficial or diffuse according to the mucosal distribution of the stained nuclei. RESULTS: Endoscopic mucosal resection samples detected cancer in 21 cases. In these cases, p53 immunohistochemistry revealed a diffuse positivity for the great majority of these cancers (90.5 percent vs. 20 percent), and Ki-67 showed a diffuse pattern for all cases (100 percent vs. 30 percent); conversely, patients without cancer revealed a superficial or negative pattern for p53 (80 percent vs. 9.5 percent) and Ki-67 (70 percent vs. 0 percent). During a mean follow-up of 31.6 months, 5 (12.2 percent) patients developed six episodes of recurrent cancer. Endoscopic mucosal resection specimens did not show any significant difference in the p53 and Ki-67 expression for patients developing cancer after endoscopic treatment. CONCLUSIONS: p53 and Ki-67 immunohistochemistry were useful to confirm the cancer; however, they had not value for predicting the recurrent carcinoma after circumferential endoscopic mucosal resection of Barrett's carcinoma.

RACIONAL: Há situações nas quais o material obtido após mucosectomia endoscópica do adenocarcinoma superficial do esôfago de Barrett é inadequado para avaliação histopatológica de suas margens. Nesses casos, a imunoistoquímica poderia ser de auxílio para predição da recurrência tumoral. OBJETIVO: Avaliar o valor da detecção imunoistoquímica da p53 e do Ki-67 na predição da recurrência tumoral após mucosectomia endoscópica circunferencial do câncer no esôfago de Barrett. MÉTODOS: Foi analisado o material proveniente de mucosectomias de 41 pacientes. Todas as biopsias endoscópicas pré-mucosectomia apresentavam displasia de alto grau e câncer foi detectado em 23 casos. A imunorreatividade foi definida pela coloração de, pelo menos, 90 por cento dos núcleos em cada campo de grande aumento, podendo ser classificada como superficial ou difusa, conforme a distribuição celular dos núcleos corados. RESULTADOS: A mucosectomia detectou o câncer em 21 casos. Nesses casos, a p53 revelou padrão difuso de positividade para a maioria dos casos (90,5 por cento vs. 20 por cento) e o Ki-67 demonstrou padrão difuso para todos os portadores de câncer (100 por cento vs. 30 por cento). Por sua vez, pacientes sem câncer revelaram padrão negativo ou apenas superficial para a p53 (80 por cento vs. 9,5 por cento) e para o Ki-67 (70 por cento vs. 0 por cento). Durante seguimento médio de 31,6 meses, cinco (12,2 por cento) pacientes apresentaram seis episódios de câncer recurrente. Neste grupo, os fragmentos de mucosectomia não demonstraram nenhuma diferença significativa na expressão imunoistoquímica da p53 e do Ki-67 nos pacientes desenvolvendo câncer após o tratamento endoscópico. CONCLUSÕES: A imunoistoquímica da p53 e do Ki-67 é útil na confirmação do câncer; contudo não demonstra nenhum valor na predição da recurrência tumoral após mucosectomia endoscópica circunferencial do esôfago de Barrett com adenocarcinoma.

[Study of the effect of aspirin on bleeding time: study about 16 volunteers]

Strong anti-binding platelets, aspirin is used in the treatment or the prevention of many thrombotic pathologies. We wanted to study the effect of aspirin over the bleeding time of a group of volunteers. It consisted of 16 volunteers aged from 20 to 25 years and having no haemorrhagic or thrombotic antecedent. For each of them, we have carried out a blood count by means of an automaton Sysmex K800, followed by a measure of the bleeding time [BT]. Immediately after, each volunteer has ingested 250 mg of Aspegic; then, the BT has been measured every 24 hours and up to the fifth day. The BT has been carried out by means of IVY technique 3 points, that besides the time, allows to measure the volume of bleeding [microl]. All the check-ups were normal, however, the time and volumes of bleeding were respective by short and weak. After having taken aspirin, the bleeding time has significantly become longer to day 1 and day 2 [respectively 48% and 31,5% with regard to day 0] and the volume has increased to day 1, day 2 and day 3 [respectively 122,6 %, 74,7 % and 38,1 % with regard to day 0]