Etoposide 150 mg/m2 twice weekly for 2 weeks and then weekly; dexamethasone initially 10 mg/m2 for 2 weeks followed by 5 mg/m2 for 2 weeks, 2.5 mg/m2 for 2 weeks, 1.25 mg/m2 for one week, and one week of tapering

Etoposide 150 mg/m2 once a week; dexamethasone initially 10 mg/m2 for 2 weeks followed by 5 mg/m2 for 2 weeks, 2.5 mg/m2 for 2 weeks, 1.25 mg/m2 for one week, and one week of tapering

dexamethasone initially 10 mg/m2 for 2 weeks followed by 5 mg/m2 for 2 weeks, 2.5 mg/m2 for 2 weeks, 1.25 mg/m2 for one week, and one week of tapering, with or without IvIG (0.5 g/kg IV, once every 4 weeks)

150 mg/m2 twice weekly for 2 weeks and then weekly

A complete response was defined as normalization of all of the quantifiable symptoms and laboratory markers of HLH, including levels of sCD25(pg/ml), ferritin(μg/L), and triglyceride(mmol/L); hemoglobin(g/L); neutrophil counts(×109/L); platelet counts(×109/L); and alanine aminotransferase (ALT(U/L)).

A partial response was defined as at least a 25% improvement in 2 or more quantifiable symptoms and laboratory markers as follows: sCD25(pg/ml) response was>1.5-fold decreased; ferritin (μg/L)and triglyceride(mmol/L) decreased at least 25%; for patients with an initial neutrophil count of<0.5 ×109/L, a response was defined as an increase by at least 100% to>0.5× 109/L; for patients with a neutrophil count of 0.5 to 2.0 × 109/L, an increase by at least 100% to >2.0 × 109/L was considered a response; and for patients with ALT >400 U/L, response was defined as an ALT (U/L)decrease of at least 50%.

Adverse events including pancreatitis, liver function damage, myelosuppression, infection, bleeding and so on.