Search Results
You are looking at 1 - 1 of 1 items for
- Author: Maria Adelaide Albergaria Pereira x
- Refine by access: All content x
Search for other papers by Sandra Valéria de Sá in
Google Scholar
PubMed
Search for other papers by Maria Lúcia Corrêa-Giannella in
Google Scholar
PubMed
Search for other papers by Márcio Carlos Machado in
Google Scholar
PubMed
Search for other papers by Jean Jorge S de Souza in
Google Scholar
PubMed
Search for other papers by Maria Adelaide Albergaria Pereira in
Google Scholar
PubMed
Search for other papers by Rosely Antunes Patzina in
Google Scholar
PubMed
Search for other papers by Sheila Aparecida Coelho Siqueira in
Google Scholar
PubMed
Search for other papers by Marcel Cerqueira César Machado in
Google Scholar
PubMed
Search for other papers by Daniel Giannella-Neto in
Google Scholar
PubMed
Insulinomas are rare endocrine neoplasias that constitute the most frequent islet cell tumours. Somatostatin (SST) analogs are tentatively used to inhibit insulin secretion and control tumour growth in patients with local invasion or inoperative metastasis, but variable responses have been reported. Data regarding somatostatin receptor (SSTR) subtypes expression in insulinomas are conflicting. In this study, we evaluated 16 cases of primary insulinomas (including four primary plurihormonal tumours) and two hepatic metastases. Histopathological and immunohistochemical analysis for some features associated with tumour aggressiveness and semi-quantitative RT-PCR for SSTR1-5 and real-time qPCR for SSTR5 were performed. SSTR subtypes 1, 3, and 5 were expressed in 100%, SSTR2 in 89%, and SSTR4 only in 22% of the insulinomas. SSTR5 mRNA was positively correlated with histopathological features related to tumour aggressiveness (large tumour diameter, well-differentiated endocrine tumour with uncertain behaviour and higher number of cells with nuclear atypia). SSTR5 mRNA expression in primary insulinomas was lower than in primary plurihormonal tumours (P < 0.05). The observed positive correlation between SSTR5 expression and tumour size suggests that the use of SST analogues more specific to SSTR5 in the treatment of insulinomas deserves attention.
