HLH was suspected due to the presence of multiple suggestive features, including high ferritin levels (33,539 ng/mL), thrombocytopenia (platelets of 53 k/μL), two lineages of cytopenia (hemoglobin of 7.7 g/dL), hypertriglyceridemia (310 mg/dL), and high serum IL-2R of (5944.2 pg/mL). This evidence concerns the gene IL2RA and hemophagocytic syndrome.