Immunohistochemical staining of STAT6 showing nuclear positivity in 51/53 cases. A. Case #1, strong staining and diffuse positive (4+) for STAT6, 200×; B. Case #24, moderate staining and diffuse positive (4+) for STAT6, 200×; C. Case #38, weak staining diffuse positive (3+) for STAT6, 200×.