As expected, patients with AI had the highest CRP (8.69 mg/dL, p < 0.001) and IL-6 levels (82.7 ng/L, p = 0.007) when compared to patients with IDA (0.12 mg/dL, 3.4 ng/L, respectively) or unclassified/multifactorial anemia (7.79 mg/dL, 70.3 ng/L, respectively). This evidence concerns the gene IL6 and anemia (phenotype).