Figure 2.

Immunohistochemical staining of renal tumor. (A) Both epithelioid and spindle cells were strong and diffusely positive for desmin (Immunoperoxidase, Original magnification ×200). (B) Both epithelioid and spindle cells were strong and diffusely positive for HMB-45 (Immunoperoxidase, Original magnification ×200). (C) Estrogen receptor (ER) immunostaining showed strong and diffuse nuclear reactivity in tumor cells (Immunoperoxidase, Original magnification ×200). (D) Progesterone receptor (PR) immunostaining showed strong and moderate nuclear reactivity in tumor cells (Immunoperoxidase, Original magnification ×200).