CORRELATION OF LEPTIN AND ADIPONECTIN RECEPTOR EXPRESSION WITH CLINICOPATHOLOGICAL PARAMETERS IN COLORECTAL CARCINOMA - A CROSS-SECTIONAL PROSPECTIVE STUDY.

BACKGROUND: Colorectal carcinoma (CRC) is one of the common carcinomas with a rising incidence of metastasis due to its advanced stage of presentation. The existing biomarkers such as CEA (Carcinoembryonic antigen) etc., for prognosis, have low sensitivity and specificity. Hence a need for a newer definitive biomarker. Obesity is the leading cause of CRC. Leptin and adiponectin secreted by adipose tissue have been studied as potential biomarkers in the field of CRC. The present study helps to understand the association of leptin and adiponectin receptors with clinicopathological parameters. OBJECTIVE: To correlate the various clinicopathological parameters with the tissue expression of leptin and adiponectin receptors in CRC. METHODS: It is a cross-sectional prospective study conducted at a tertiary care hospital. Formalin fixed paraffin blocks of all radical resection CRC cases were collected and immunohistochemistry (IHC)was carried out on tumor tissue for leptin and adiponectin receptor. Tumor characteristics and clinical parameters were collected from the hospital medical records. Pearson's correlation coefficient test was used. RESULTS: Immunohistochemistry was performed on 60 cases of CRC. Significant positive correlation of leptin was observed with size, lymph node metastasis, advanced stage, and grade of tumor (P<0.05). A significant correlation between adiponectin receptor and CRC was observed concerning age, stage, lymph node metastasis, distant metastasis and grade of tumor. CONCLUSION: Positive expression of leptin and negative expression of adiponectin receptors in CRC helps to predict the risk of metastasis.

Status de expressão do receptor de leptina e adiponectina no carcinoma colorretal: A cross-estudo prospectivo seccional / Correlation of leptin and adiponectin receptor expression with clinicopathological parameters in colorectal carcinoma - a cross-sectional prospective study

ABSTRACT Background: Colorectal carcinoma (CRC) is one of the common carcinomas with a rising incidence of metastasis due to its advanced stage of presentation. The existing biomarkers such as CEA (Carcinoembryonic antigen) etc., for prognosis, have low sensitivity and specificity. Hence a need for a newer definitive biomarker. Obesity is the leading cause of CRC. Leptin and adiponectin secreted by adipose tissue have been studied as potential biomarkers in the field of CRC. The present study helps to understand the association of leptin and adiponectin receptors with clinicopathological parameters. Objective: To correlate the various clinicopathological parameters with the tissue expression of leptin and adiponectin receptors in CRC. Methods: It is a cross-sectional prospective study conducted at a tertiary care hospital. Formalin fixed paraffin blocks of all radical resection CRC cases were collected and immunohistochemistry (IHC)was carried out on tumor tissue for leptin and adiponectin receptor. Tumor characteristics and clinical parameters were collected from the hospital medical records. Pearson's correlation coefficient test was used. Results: Immunohistochemistry was performed on 60 cases of CRC. Significant positive correlation of leptin was observed with size, lymph node metastasis, advanced stage, and grade of tumor (P<0.05). A significant correlation between adiponectin receptor and CRC was observed concerning age, stage, lymph node metastasis, distant metastasis and grade of tumor. Conclusion: Positive expression of leptin and negative expression of adiponectin receptors in CRC helps to predict the risk of metastasis.

RESUMO Contexto: O carcinoma colorretal (CCR) é um dos carcinomas comuns com incidência crescente de metástases devido ao seu estágio avançado de apresentação. Os biomarcadores existentes como CEA (antígeno carcinoembrionário) etc., para prognóstico, apresentam baixa sensibilidade e especificidade. Daí a necessidade de um biomarcador definitivo mais recente. A obesidade é a principal causa do CCR. A leptina e a adiponectina secretadas pelo tecido adiposo têm sido estudadas como potenciais biomarcadores na área do CCR. O presente estudo ajuda a compreender a associação dos receptores de leptina e adiponectina com parâmetros clinicopatológicos. Objetivo: Correlacionar os diversos parâmetros clinicopatológicos com a expressão tecidual dos receptores de leptina e adiponectina no CCR. Métodos: Trata-se de um estudo transversal, prospectivo, realizado em um hospital terciário. Blocos de parafina fixados em formalina de todos os casos de CCR de ressecção radical foram coletados e a imuno-histoquímica (IHQ) foi realizada no tecido tumoral para receptor de leptina e adiponectina. As características do tumor e os parâmetros clínicos foram coletados dos prontuários médicos do hospital. Foi utilizado o teste do coeficiente de correlação de Pearson. Resultados: A imunohistoquímica foi realizada em 60 casos de CCR. Correlação positiva significativa da leptina foi observada com tamanho e metástase linfonodal, estágio avançado e grau do tumor (P<0,01). Foi observada uma correlação significativa entre o receptor de adiponectina e o CCR em relação à idade, estágio, metástase linfonodal, metástase à distância e grau do tumor. Conclusão: A expressão positiva de leptina e a expressão negativa de receptores de adiponectina no CCR ajudam a prever o risco de metástase.