retrospective data collection to study: type of HLH familial vs secondary, sex, age, presence of infectious cause, involvement central nervous system ( SNC), hepatic involvement, presence of hemophagocytosis, presence of splenomegaly, presence of involvement of other organs, the value of neutrophils (PMN), the value of hemoglobin, platelets, albumin, triglycerides, ferritin, LDH, type of therapy and the response to therapy after 2 months
Monocentric, observational, retrospective, no profit study aimed to analyze factors that are significantly impacting the outcome of patients diagnosed with HLH.