C-Reactive Protein and Sodium in Predicting Anastomotic Leakage

* Investigate the effectiveness of postoperative C-reactive protein and sodium values in predicting anastomotic leakage in the early postoperative period in patients who have undergone anastomosis following resection for non-metastatic colorectal cancer, and their superiority to each other. * Investigate the effectiveness of these laboratory parameters in developing anastomotic leaks according to tumor location and different age subgroups (\<45 years, 45-65 years,\> 65 years).