Efficacy of Short Course of Intravenous Dexamethasone and Intravenous Immunoglobulin Therapy in Infection-Related Secondary Hemophagocytic Lymphohistiocytosis (isHLH) (isHLH-IVD/IVIg)

Rationale/Gaps in Existing Knowledge: Therapy of Infection-associated Secondary Hemophagocytic lymphohistiocytosis (sHLH) in adult lacks evidence from randomized trial guiding first-line immunomodulation and current therapeutic practice primarily extrapolated from decades old pediatric HLH protocols and retrospective studies. In presence of infection very expensive therapy with intravenous Immunoglobulin (IVIG) is preferred over Dexamethasone, however the comparative efficacy of IVIG and Dexamethasone alone remains undefined, especially in resource-constraints settings. (ii) Novelty: This will be among the first randomized controlled trials in adults with infection-associated sHLH, directly comparing efficacy of IVIG with Dexamethasone. The study uniquely integrates clinical outcomes with economic feasibility in a low-middle income setting. (iii) Objectives: Primary objectives will be to compare the efficacy of intravenous (IV) Dexamethasone and IVIG in achieving clinical remission and recovery of HLH-associated cytokines (IL-1, IL-6, TNF-α, IFN-γ, GM-CSF) and Ferritin level. Secondary objectives include assessment of hematologic recovery, adverse events, and short-term mortality. (iv)Method: In this Randomized controlled open-label, non-inferiority clinical trial participants with sHLH, will be allocated (1:1) to receive either short-course of IV Dexamethasone or IVIG along with infection-directed standard care and will be followed-up for 4 weeks to evaluate predefined clinical outcome and laboratory parameters. (v) Expected Outcome: The study aims to establish whether IV Dexamethasone is non-inferior to IVIG for achieving clinical remission, recovery of HLH-associated cytokines level and reduction of short-term mortality. Results are expected to reform evidence-based, cost-effective therapeutic strategies for infection-associated sHLH and improve access to care in resource-constraint healthcare systems.