Predictive model using hemoglobin, albumin, fibrinogen, and neutrophil-to-lymphocyte ratio to distinguish patients with colorectal cancer from those with benign adenoma.

Colorectal cancer (CRC) is associated with inflammation, activation of coagulation, and mild anemia. Hematological parameters reflecting ongoing cancer may have the potency to be effective for early diagnostics of CRC. The aim of this study was to examine the validity and relationship between some biochemical and hematological parameters for the early diagnosis of CRC. We designed a prospective observational cohort study to analyze whether these laboratory markers have the potency to distinguish benign tumors from malignant before planned surgery. The clinical data were collected from 208 patients with suspected benign or malignant colorectal tumors who were eligible for elective surgery between September 2018 and January 2020. Blood samples were collected one day before surgery, examined parameters included: complete blood count, hemoglobin (HGB) concentration, albumin (ALB), C-reactive protein (CRP), interleukin-6 (IL-6), and fibrinogen (FG). Absolute neutrophil and lymphocyte counts were used for the calculation of the neutrophil-to-lymphocyte ratio (NLR). The diagnosis was confirmed by histopathological examination. The 197 patients were divided into the group of benign (B group = 52 patients) or malignant tumors (CRC group = 145 patients). ROC curves and cut-off values of NLR, HGB, FG, and ALB concentration, serum CRP and IL-6 levels. In the cohort of 197 adult patients submitted for the elective colorectal surgery, the complete blood samples drawn one day before surgery showed significant differences between patients with benign tumors and colorectal carcinoma: HGB (mean 139.9 g/l vs. 129.9; p<0.001), FG (mean 3.36 g/l vs. 3.94 g/l; p<0.001), ALB (mean 43.4 g/l vs. 41.1 g/l; p=0.001), NLR (mean 2.73 vs. 3.88; p=0.016), respectively. CRP (mean 2.9 mg/l vs. 4.4 mg/l; p=0.011), thrombocyte count (mean 235×109/l vs. 265×109/l; p<0.029). Differences in IL-6 concentrations were not significant (2.9 pg/ml vs. 4.15 pg/ml; p=0.052). Using multivariable logistic regression analysis, four valid parameters (HGB, FG, ALB, and NLR) were suitable for the construction of a diagnostic predictive model for the identification of CRC. In conclusion, a panel of routinely examined blood parameters like HGB, FG, ALB, and NLR has the potency to distinguish patients with benign tumors from malignant by applying a diagnostic predictive model for early laboratory detection of CRC.