AI Summary & Key Takeaways
AI InsightOverall survival (OS) and Disease Free Survival (DFS) rates were estimated using the Kaplan–Meiermethod.
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Abstract
Aim: To evaluate the prognostic value of pre/postoperative serum levels of Carcinoembryonic antigen (CEA), Carbohydrate antigen19-9 (CA 19-9), and their relationship with primary localization and stage of colorectal cancer (CRC) patients.Materials and Methods: 255 patients who underwent curative or palliative surgery with the diagnosis of CRC between 2015 and 2020were included in the study. The patients were divided into groups as right colon tumor and left colon tumor based on the region ofthe primary tumor. Baseline data on age, sex, location of primary tumor, disease stage, histological differentiation, BRAF and RASmutation situations and serum CEA and CA 19-9 levels were recorded before and after surgery. Individuals were followed for at leastsixty months or until they died. Overall survival (OS) and Disease Free Survival (DFS) rates were estimated using the Kaplan–Meiermethod. Results: 103 patients had right sided (41.4%) and 152 patients (59.6%) had left sided CRC. Most of the patients were in the early stage(71%). DFS and OS patients with left colon tumors were longer than the right. [(DFS, 32.18 (6-60) vs. 34.25 (6-60) months, p=0.332)and (OS, 41.16 (6-60) vs. 49.05 (11-60) months, p=0.002]. An assessment of the prognosis showed that the OS was significantlyworse in the patients with a high CEA level (p=0.001) and in the patients with a high CA 19-9 level (p=0.001). In multivariate analysis,normal serum CA 19-9 levels (p=0.002), RAS wild type tumor (p