Immunohistochemical staining showed strong and diffuse paired-box gene 8 (PAX8) and CK7 staining, with patchy and weak CD10 and GATA-3 staining, and negativity for RCC, HMWCK, p63, P504S, S100, CK20, SMA, and desmin (Figures 3A, 3B). Here, PAX8 is linked to renal cell carcinoma.