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Leptin phenotype has been suggested to be a possible biomarker for the diagnosis and prognosis of different neoplasms. Nonetheless, there are conflicts among the outcomes found in several tumors, and little is proven concerning the correlation between the phenotype of leptin and its clinical significance in colorectal carcinomas. This study will describe the phenotype of leptin in colorectal adenocarcinomas, and investigate its correlation with clinicopathological factors.Two hundred and twenty eight tissue samples include 155 colorectal carcinomas, 40 adenomas, and 33 noncancerous cases were utilized in constructing tissue microarrays which have been used in the revealing of leptin expression using leptin monoclonal antibody and immunohistochemistry staining protocol.Immunoexpression of leptin was recognized in 145 (93.5%) of colorectal tumors and 56 (76.7%) cases of control group. Histotype was considerably associated with leptin phenotype (P = .000), there is up regulation in leptin expression in colorectal carcinoma cases. Significantly higher proportion of negative leptin immunostaining cases were observed in tumors which have size more than 5 cm (P = .045). Whereas, significant different survival patterns were observed in positive cases regarding tumor size, lymphovascular invasion, distant metastasis, local recurrence and relapse of disease (P-values .046, .011, .000, .013, and .001, respectively). On the other hand, positive leptin staining colorectal tumors with size <5 cm, and with no distant metastases, local recurrence, or disease relapse had significantly better survival estimates. However, leptin immunostaining did not show noteworthy associations with age, gender, differentiation, tumor location, stage, margins involvement, lymphovascular invasion, and lymph node metastasis.The current study shows up regulation in leptin expression in colorectal adenocarcinoma compared with noncancerous control cases. Thus, immunohistochemical staining of leptin in colorectal cancer could be a helpful tool in the prediction of prognosis and survival pattern of colorectal cancer with certain clinicopathological factors (tumor size, lymphovascular invasion, distant metastasis, local recurrence, and relapse of disease).

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Expression of leptin in colorectal adenocarcinoma showed significant different survival patterns associated with tumor size, lymphovascular invasion, distant metastasis, local recurrence, and relapse of disease in the western province of Saudi Arabia