In relation to cytokine levels in F0 group, statistically significant decrease in group of patients with fibrosis (F1, F3) was recorded for IFNγ (p = 0.039), IL-2 (p = 0.033), IL-17 (p = 0.039) and IL-13 (p = 0.047). The gene discussed is IFNG; the disease is fibrosis.