The toxicity of human lymphocytes against MCF-7 breast cancer cells was assessed by using a pectin guar gum zinc oxide nanocomposite, finding it increased IFN-γ, interleukin 2 (IL-2), and TNF-α cytokine release, CD3, CD8, and CD56 expression, and cancer cell mortality [20]. This evidence concerns the gene IL2 and breast cancer.