Influence of Tumor Associated Immunity on the Number of Lymph Node Retrieved After Colorectal Cancer Surgery (Preliminary Study)

Hypothesis of this study is that increased immunity of primary tumor affects the increased number of lymph node retrieved. This study investigates whether immunity-related cytokine expression on primary tumor, colonic mucosa, and serum is associated with the number of lymph node retrieved in colorectal cancer patients.

Inclusion Criteria:

• 1. Histologically confirmed colorectal cancer 2. Non-metastatic cancer (cTNM I, II, or III) 3. Over 20 years of age 4. Curative resection (R0)

Exclusion Criteria:

• 1. Patient with distant metastasis 2. History of chemotherapy or radiation therapy for malignancy 3. Patient receiving immunosuppressive or anti-inflammatory treatment 4. Hereditory colorectal cancer 5. Preoperative chemoradiation therapy for colorectal cancer 6. Pregnancy 7. Emergency