RESUMO
Microsatellite instability (MSI) is a hallmark tool for Lynch syndrome (LS) screening and a prognostic marker for sporadic colorectal cancer (CRC). In regions with limited resources and scarce CRC molecular characterization as South America, the implementation of universal MSI screening is under debate for both its purposes. We sought to estimate the frequency of BAT26 in colorectal adenocarcinomas and to determine associated clinical and histological features. Consecutive patients from a CRC registry were included. BAT26 determination was performed in all cases; if instability was found, immunohistochemistry (IHC) and BRAF mutation analyses were done, as appropriate. Differences were assessed by chi-squared or Fisher's exact test, or by T test or Mann-Whitney. Multiple logistic regression was used to identify factors independently associated with BAT26-unstable tumors. We included 155 patients; mean age was 65.6 (SD 14.4) and 56.1% were male. The frequency of BAT26-unstable tumors was 22% (95% CI 15.7-29.3). Factors independently associated with BAT26-unstable tumors were right colon localization (OR 3.4, 95% CI 1.3-8.7), histological MSI features (OR 5.1, 95% CI 1.9-13.6) and Amsterdam criteria (OR 23.2, 95% CI 1.9-286.7). IHC was altered in 85.3% BAT26-unstable tumors and 70.6% lacked MLH1 expression; 47.8% of these harbored BRAF V600E mutation. We provide evidence to link the frequency of BAT26 to an increased diagnostic yield (up to 1.4-folds) of suspected LS cases in comparison to the revised Bethesda guidelines alone. In regions with limited resources, clinical and histological features associated with BAT26-unstable status could be useful to direct MSI screening in sporadic CRCs and may help guide clinical care and future research.
Assuntos
Adenocarcinoma/genética , Biomarcadores Tumorais/genética , Neoplasias Colorretais/genética , Marcadores Genéticos/genética , Repetições de Microssatélites/genética , Adenocarcinoma/diagnóstico , Adenocarcinoma/patologia , Adulto , Idoso , Argentina , Estudos de Coortes , Neoplasias Colorretais/diagnóstico , Neoplasias Colorretais/patologia , Neoplasias Colorretais Hereditárias sem Polipose/diagnóstico , Neoplasias Colorretais Hereditárias sem Polipose/genética , Neoplasias Colorretais Hereditárias sem Polipose/patologia , Análise Mutacional de DNA , Feminino , Humanos , Masculino , Instabilidade de Microssatélites , Pessoa de Meia-IdadeRESUMO
Introducción: En el Hospital Italiano de Buenos Aires se realizó una campaña de vacunación masiva destinada al personalde la institución durante mayo de 2009.Objetivo: Medir síntomas gripales asociados a la vacunación en personal de salud. Métodos: Estudio de cohorte. Se compararon, mediante riesgo relativo, las incidencias de los síntomas gripales informados para la semana epidemiológica 20, por 400 vacunados durante dicha semana y 400 no vacunados, apareados por edad, sexo y profesión. Los síntomas comunicados dentro de las 48 horas posteriores a la vacunación se consideraron secundarios a ella. Resultados: Fueron encuestados 583 (72.5%) de los cuales 281 vacunados y 302 no vacunados: edad media 36 (DS 11) vs. 35.2 (DS 10.5); mujeres 54% vs. 57% y médicos 21% vs. 18%. En la semana de vacunación presentaron fiebre 12.46% vs. 6.95% (RR 1.79, IC95% 1.07-3), coriza 24.2% vs. 17.22% (RR 1.41 IC95%1.02-1.94), odinofagia 11.74% vs. 0.33%(RR 35.47 IC 95% 4.88-257), dolor corporal 18.86% vs. 14.57% (RR 1.29 IC 95% 0.9-1.87) vacunados y no vacunados, respectivamente. Se atribuyen a la vacuna: dolor corporal 9.25% (IC95% 6.3-13.6), coriza 8.19% (IC95% 5.4-12.31); fiebre 6.78% (IC95% 4.31-10.6) y odinofagia 4.27% (IC 95% 2.42-7.5). Y dolor de brazo 65%. Los médicos no informaronmayor frecuencia de síntomas gripales.Discusión: En la literatura, la odinofagia y la coriza no están asociadas a la vacunación, la frecuencia de los otros síntomas a las 48 horas fue similar a la informada. Conclusión: El síndrome gripal fue descripto con mayor frecuencia entre los vacunados y puede ser resultado de un sesgo de reporte.
Introduction: In May 2009, prior to the beginning of winter in the Southern hemisphere, a massive vaccination campaign for the personnel was performed at the Hospital Italiano de Buenos Aires. Objective: To assess symptoms associated with influenza vaccination in health personnel. Methods: In a cohort study, the impact of flu symptoms reported for the epidemiological week number 20 were compared using the relative risk between 400 vaccinated vs. 400 unvaccinated individuals matched for age, sex and occupation. Symptoms reported within 48 hours after vaccination were considered secondary this event. Results: 583 people were respondents (72.5%) of whom 281 were vaccinated vs. 302 who were unvaccinated (mean age, 36 yr (SD 11 yr) vs. 35.2 yr (SD 10.5 yr); women, 54% vs. 57%; doctors 21% vs. 18%, respectively). During the vaccination week, 12.46% vaccinated vs. 6.95% unvaccinated individuals presented fever (RR 1.79, CI95% 1.07-3); a cold, 24.2% vs. 17.2% (RR 1.41, CI95% 1.02-1.94); sore throat, 11.74% vs. 0.33% (RR 35.47, CI 95% 4.88-257); body pain, 18.86% vs. 14.57% (RR 1.29, CI 95% 0.9-1.87), respectively. Symptoms attributed to the vaccine were: body pain, 9.25% (CI95% 6.3-13.6); cold, 8.19% (CI95% 5.4-12.31); fever, 6.78% (CI95% 4.31-10.6); sore throat, 4.27% (CI 95% 2.42-7.5); and arm pain, 65%. Doctors did not report a higher frequency of flu symptoms.Discussion: Sore throat and cold are not symptoms commonly reported in association with vaccination. The frequency of other symptoms following the first 48 hours of vaccination was similar to previous reports. Conclusion: The flu syndrome was reported more frequently in vaccinated people as compared with those unvaccinated.However, these results might be due to a reporting bias.