The dosage of zanubrutinib is 160mg twice a day (80mg twice a day for patients over 75 years old) for 2 months. The remission rate is evaluated after treatment. If it is above PR, continue the dose maintenance treatment.

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%.

from date of inclusion to date of progression, relapse, or death from any cause

Adverse events including myelosuppression, infection, hemorrhage