PAX8 and renal cell carcinoma: Histopathological examination revealed they were paired box gene 8-positive (PAX8+), cluster of differentiation 10-positive (CD10+), RCC-positive, creatine kinase-positive (CK+), vimentin-positive, hepatocyte-negative, and thyroid transcription factor 1-negative (TTF-1−) (Fig. 3).