<![CDATA[Background: Colorectal adenocarcinoma is defined as a malignant epithelial tumor of the large intestine (colon and rectum) that shows glandular and mucinous differentiation, accompanied by invasion through the muscular mucosae into the submucosal layer. Peritumoral budding refers to tumor budding at the leading edge of the tumor and can be considered one of the prognostic factors. Immunohistochemistry Pancytokeratin (AE1/AE3) is observed in the epithelium, and most carcinomas (tumors originating from epithelial cells) are stained in the cytoplasm. Method: The analytical study involved 48 paraffin block samples diagnosed as colorectal adenocarcinoma NOS at Haji Adam Malik Central General Hospital in Medan and the laboratory of the Faculty of Medicine, Universitas Sumatera Utara. The assessment of tumor budding using hematoxylin-eosin staining and pan-cytokeratin (AE1/AE3) immunohistochemical staining was classified equally into three categories: low budding category if 0-4 buds of tumor budding were observed, intermediate budding category if 5-9 buds of tumor budding were observed, and high budding category if ≥10 buds of tumor budding were observed. Results: There is no difference in assessing peritumoral budding using Hematoxylin-Eosin (HE) staining and pan-cytokeratin (AE1/AE3) immunohistochemical staining. Conclusion: Assessment of peritumoral budding is recommended using Hematoxylin-Eosin (HE) staining.]]>
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