IL6 and neoplasm: A correlation analysis was performed on the levels of 12 CKs in the patients’ serum and the degree of tumor differentiation, revealing a significant correlation between IL-1β (P ═ 0.008), IL-6 (P ═ 0.005), and IL-8 (P ═ 0.05) levels and the degree of tumor differentiation (Figure 1B) (Table 3).