Features of expression of somatostatin receptors in gastric carcinomas depending on the proportion of the neuroendocrine component

Abstract

In 50 patients with gastric cancer, a neuroendocrine component was screened using immunohistochemical studies with antibodies to chromogenic and synaptophysin in the surgical material, as well as a somatostatin receptor status researcher (SSTR). The neuroendocrine component in various proportions was found in 62% of observers. In 2 neuroendocrine carcinomas, expression of type 2 SSTR was observed at the level of “2+”, and only one adeno-neuroendocrine carcinoma produced the same expression. In carcinomas with and without neuroendocrine component, the expression of various types of SSTR was detected in 61.8% of observers in both neuroendocrine and exocrine structures. In the group of highly differentiated neuroendocrine tumors, 100% of the observers detected the expression of at least one of the 5 types of somatostatin receptors, and in 95% - at the «3+» level. The data obtained do not allow making statistically significant conclusions about the dependence of the expression of SSTR on the presence of the neuroendocrine component, but with the prospect of further study not only in neuroendocrine tumors, but also in exocrine and mixed carcinomas.