Chidamide combines with VP-16 and methylprednisolone

Chidamide 30mg TIW po，etoposide 100 mg/m2 was administered day1; methylprednisolone 2mg/kg days 1 to 3,then 0.75mg/kg day 4 to 6，0.25mg/kg day 7 to 9，and 0.1mg/kg day 10 to 21

A complete response was defined as normalization of all of the quantifiable symptoms and laboratory markers of HLH, including levels of sCD25, ferritin, and triglyceride; hemoglobin; neutrophil counts; platelet counts; and alanine aminotransferase (ALT).

A partial response was defined as at least a 25% improvement in 2 or more quantifiable symptoms and laboratory markers as follows: sCD25 response was>1.5-fold decreased; ferritin and triglyceride 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 decrease of at least 50%.Overall response rate (ORR) is defined as the ratio of patients with CR and PR to overall patients

EBV-DNA copies in peripheral blood for patients with EBV positive when they enrolled

Adverse events including liver function damage, myelosuppression, infection, bleeding