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Objectives  A rising frequency of colorectal carcinoma has been noted in recent years in Pakistan. In the present study, we aimed to evaluate clinicopathologic features of colorectal carcinoma in our population so that protocols could be developed to stratify patients that may require further biomarker/molecular testing. Furthermore, histological features which predict higher T and N stage were also evaluated.    Results  Median age at diagnosis was 54.5 (19–85) years. 79% cases were of conventional adenocarcinoma while 13% cases were of mucinous carcinoma. Most of the cases were at T3 stage (81%), while 27 and 68% of cases revealed lymphovascular invasion and nodal metastasis respectively. Mucinous and signet ring tumors were associated with a higher N stage. Pre-existing polyp was associated with lower T and N stage. We found a high proportion of our cases to present at advanced T-stage. Tumor grade and lymphovascular invasion were found to be associated with higher N-stage while tumor infiltrating lymphocytes was associated with lower T and N-stage. Moreover, a high frequency of mucinous differentiation may be linked to microsatellite instability in our cases of colorectal carcinoma; therefore, we suggest that microsatellite instability testing in colorectal carcinoma should be evaluated in our setup.

Clinicopathologic features of colorectal carcinoma: features predicting higher T-stage and nodal metastasis