Introduction Tumors most often develop due to inflammatory factors, including inflammatory cells that produce cytokines and cytotoxic mediators that can stimulate malignant transformation. Knowing that interleukin-6 (IL-6) and C-reactive protein (CRP) factor into the development of colorectal cancer (CRC), we aimed to assess IL-6 and CRP's relationship with the stage and differentiation of CRC. Methods In a sample of 46 patients with CRC, as confirmed by histopathological examination, plasma levels of IL-6 and CRP were measured from peripheral venous blood samples before surgery and examined using enzyme-linked immunosorbent assay. Results Most patients were male (63.0%) and at least 50 years old (73.9%). A positive correlation emerged between stage of CRC and both plasma IL-6 ( r = 0.396, p = .003) and CRP ( r = 0.376, p = .005) levels, which the Kruskal–Wallis test indicated were highest in stage IV (IL-6: median = 25.80, p = .019; CRP: median = 34.10, p = .040). Plasma IL-6 levels (median = 25.80, p = .019) were higher in well-differentiated CRC, whereas plasma CRP levels (median = 34.10, p = .040] were higher in poorly differentiated tissue. Linear plotting revealed a linear relationship between plasma IL-6 and plasma CRP levels in patients with CRC. Conclusion Because the stage of CRC significantly correlates with plasma IL-6 and CRP levels, IL-6 and CRP can serve as diagnostic factors in assessing the progress and prognosis of CRC.

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Background The 5-year overall survival (OS) rate for colorectal cancer (CRC) has been reported as 39%, and the 5-year recurrence-free survival (RFS) rate has been reported as 14%. Various prognostic factors have been associated with differences in survival rates among CRC patients. This study investigated the difference between several prognostic factors and the OS and RFS rates of CRC patients at the Dr. Wahidin Sudirohusodo General Hospital Makassar in Indonesia. Materials and methods The study group comprised all CRC patients treated at the Division of Digestive Surgery from 2014 to 2016. Prognostic factor data were collected from medical records for 293 patients. The OS and RFS rates were analyzed using the bivariate Kaplan–Meier method and log-rank tests. Results Log-rank analysis of the association of age, histopathology, stage, definitive surgery, chemotherapy, and radiotherapy with the OS rate showed p -values of 0.031, 0.009, 0.014, 0.000, 0.343, and 0.381, respectively. Log-rank analysis of the association of these prognostic factors with the RFS rate showed p -values of 0.282, 0.006, 0.008, 0.020, 0.002, and 0.000, respectively. Conclusion There were significant differences in the OS rate according to age, histopathology, stage, and history of definitive surgery. Histopathology, stage, history of definitive surgery, and chemotherapy and radiotherapy were significantly associated with differences in the RFS rate.