Graft versus Host Disease Market to grow at 9.9% CAGR (2020-2034), driven by branded therapies, strong pipeline, and increased awareness. Market size in the US was $1 billion in 2023, expected to grow at 7.4% CAGR (2024-2034). Emerging therapies like Axatilimab and CSL964 to transform market. Key companies include Equillium, Biocon, Takeda, and CSL Behring.