Used in research to modulate immune cell activity, particularly in studies involving B-cell signaling and inflammation. It helps investigate pathways involved in autoimmune diseases and certain cancers, especially hematologic malignancies. Due to its selectivity for the PI3Kδ isoform, it enables targeted suppression of overactive immune responses without broadly affecting other cellular functions. Commonly applied in preclinical models to evaluate therapeutic potential and mechanism of action in immune-related disorders.