The last comparison among the breast cancer patients with different malignancy grades show that IL-2 level was higher in the group with high grade, followed by moderate grade and low grade, but the result was not statistically significant (21,57 pg/mL; 19,03 pg/mL and 13,79 pg/mL respectively; Kruskal-Wallis test; P: 0,290). Here, IL2 is linked to breast cancer.