Protein Phosphatase 2A segmentation by application delineates four primary demand drivers: oncology, neurology, immunology, and other therapeutic areas. In oncology, PP2A functions as a tumor suppressor, and its modulation is investigated for solid‑tumor and hematologic malignancies, accounting for roughly 40 % of total market revenue due to extensive clinical trial pipelines and high R&D spend. Neurology applications, focused on neurodegenerative disorders such as Alzheimer’s and Parkinson’s disease, represent about 30 % of the market, reflecting growing investment in disease‑modifying therapies. Immunology, targeting autoimmune conditions and inflammatory pathways, contributes approximately 20 % of market size, driven by emerging biologics that incorporate PP2A‑based mechanisms. The residual 10 % falls under “other” applications, including metabolic and cardiovascular research, where PP2A serves as a signaling regulator but with limited commercial traction. Collectively, these application segments shape the overall Protein Phosphatase 2A market, with their relative shares informing strategic allocation of resources and forecasting.