B7-H4 represents a site-specific immunotherapy target in small bowel gastrointestinal stromal tumor
This study identifies B7-H4 as a site-specific, highly upregulated immune checkpoint in small bowel gastrointestinal stromal tumors (GISTs) that drives an immunosuppressive microenvironment, distinguishing them from gastric GISTs and highlighting B7-H4 as a promising therapeutic target for this aggressive subtype.