Low Expression of E-Cadherin and Cdh1 Variants Associated with Diffuse Gastric Cancer

ABSTRACT Background Reduced or null expression of E-cadherin protein is a frequent cause of diffuse gastric cancer (DGC). More than 50% of patients with DGC present somatic variants in CDH1 gene. Objectives The objectives of this study were to study E-cadherin expression and identify variants in the CDH1 gene in gastric tumors of patients with DGC. Methods We studied 18 Mexican DGC patients who attended a hospital of the Mexican Social Security Institute; E-cadherin expression was determined by immunohistochemistry, and variants were identified by Sanger sequencing in promoter and coding regions. Predictive analysis was performed using PolyPhen-2 and HOPE software. Results We found that 56% of DGC patients showed reduced expression of E-cadherin. All patients carried CDH1 variants; overall, 12 different CDH1 variants were identified. Predictive analysis revealed that the rs114265540 variant was probably damaging, with a value of 0.985, indicating a functional impact on the E-cadherin protein. Variants rs34939176 and rs33964119 were identified as risk factors for DGC (odds' ratios [OR] = 31.3, 95% CI 6.3-154.0, p < 0.001; OR = 6.1, 95% CI 2.0-19.0, p < 0.001, respectively) given their elevated frequency and by comparing it with those reported for MXL population in the 1000 Genomes Project database. Conclusions In this Mexican population, the percentage of diffuse gastric tumors with reduced expression of E-cadherin was similar to that reported in other populations. All gastric tumors of DGC patients studied had somatic CDH1 gene variants; however, the rs114265540, rs34939176, and rs33964119 variants were importantly related to DGC.

Doença de Crohn associada a tumor carcinoide gástrico: relato de caso e revisão de literatura / Crohns disease associated with gastric carcinoid tumor: a case report and literature review

Os tumores carcinoides gástricos são neoplasias raras, derivadas das células enterocromafins e podem associar-se a doenças inflamatórias intestinais, como a doença de Crohn. Atualmente, há aumento da incidência devido a maior realização de endoscopia digestiva alta. A abordagem depende do tipo, tamanho e número de lesões, além da presença de metástases. Este é o relato de caso de um paciente com doença de Crohn associada a tumor carcinoide gástrico.

The gastric carcinoid tumors are rare, derived from the enterochromaffin cells and may be associated with inflammatory bowel diseases such as Crohns disease. Currently, there is increased incidence due to higher performing endoscopy. The approach depends on the type, size, number of lesions and the presence of metastases. This is a case report of a patient with Crohns disease associated with gastric carcinoid tumor.

Supervivencia en adenocarcinoma gástrico posterior a tratamiento adyuvante tratados en el Instituto Nacional de Cancerología de Colombia durante el 2009 / Survival in gastric adenocarcinoma patients after adjuvant treatment in the Colombian National Institute of Cancerology during 2009

Objetivo: Determinar la supervivencia libre de enfermedad y global a dos años en pacientes con cáncer gástrico que recibieron tratamiento adyuvante en el Instituto Nacional de Cancerología de Colombia (INC) durante el 2009. Pacientes y métodos: De forma retrospectiva, se incluyeron pacientes con diagnóstico de adenocarcinoma gástrico o de la unión gastroesofágica que hubieran recibido quimioterapia adyuvante en el INC durante el 2009. Se describieron las características clínicas, epidemiológicas, tratamiento recibido, supervivencia global y libre de enfermedad a dos años. Resultados: Se incluyeron en el análisis a 32 pacientes. La edad media fue de 55 años. Los hombres representaron el 56,2% de los casos. El subtipo histológico predominante fue el intestinal (53,1%). El grado de invasión tumoral T3-T4 se presentó en el 81,2%, y el compromiso ganglionar, en el 84,3%, con 34,3% de los casos, con siete o más ganglios comprometidos. El 96,8% recibieron tratamiento adyuvante de acuerdo con el protocolo Macdonald. El 75% de los pacientes completaron el tratamiento. En el 12% de los casos se suspendió el tratamiento por toxicidad. El seguimiento medio de los pacientes fue de 37,8 meses. La supervivencia global y libre de enfermedad a dos años en pacientes que recibieron quimioterapia adyuvante fue de 85,18% y 77,4%, respectivamente. Conclusiones: El estudio mostró una mayor supervivencia global y libre de enfermedad para pacientes que recibieron tratamiento adyuvante en el INC frente a la encontrada en los estudios INT 0116 y MAGIC; la supervivencia es similar a estudios con población asiática.

Objective: To determine the disease free and overall survival at two years in patients with gastric cancer who received adjuvant treatment in the Colombian National Institute of Cancerology (INC) during 2009. Patients and methods: A retrospective study was conducted on patients with a diagnosis of a gastric adenocarcinoma or of the gastroesophageal junction and who had received adjuvant chemotherapy in the INC during the year 2009. The variables recorded were: clinical and epidemiological characteristics, treatment received, and the overall and disease free survival at two years. Results: A total of 32 patients (56.2% males), with a mean age of 55 years were included in the analysis. The most predominant histological sub-type was intestinal (53.1%). T3-T4 tumor invasion grade was present in 81.2%, and lymph involvement in 84.3%, with 34.3% of cases with seven or more lymph nodes involved. Almost all of them (96.8%) received adjuvant treatment according to the Macdonald protocol. Three-quarters (75%) of the patients completed the treatment. Treatment was stopped in 12% of cases due to toxicity. The mean follow-up of the patients was 37.8 months. The overall and disease free survival was at two years in the patients who received adjuvant chemotherapy was 85.18% and 77.4%, respectively. Conclusions: The study showed a greater overall and disease free survival in patients who received adjuvant treatment in the INC compared to that found in patients in the INT 0116 and MAGIC studies. The survival is similar to that in studies with Asiatic populations.

Clinical Applications of Multislice Helic CT Virtual Gastroscopy andThree Dimensional Imaging in Gastric Tumors / 实用放射学杂志

Objective To assess feasibility of three-dimensional(3D) reconstruction techniques and virtual gastroscopy of CT(CTVG)in diagnosing gastric tumors.Methods 22 cases doubted with gastric lesions were scaned by mutislice helic CT and reconstructed into CTVG and 3D images.The results were compared with fiberoptic gastroscopy(FG) and all of the cases were sure with gastric lesions and biopsied by gastroscopy or surgery operation.Results 22 patients was examinated successfully,and the lesions was proved by pathology of FG or operation.According to location and shape of lesions,there were more ulcer type(16) and more located at gastric antrum(14) in this specimen.Both CTVG and FG had one misdiagnosis respectively.Conclusion CTVG combined with 3D of MSCT is same sensitivity and specificity as FG.