Clear Cell Renal Cell Carcinoma

A 58-year-old Indian male presents with incidental discovery of a 4 cm left renal mass on CT abdomen done for unrelated abdominal pain. Imaging shows a golden-yellow, well-circumscribed cortical lesion with heterogeneous enhancement and a tumor thrombus extending into the renal vein. Histopathology reveals the pattern marked **A** in the diagram—nests of polygonal cells with abundant clear cytoplasm separated by delicate sinusoidal vascular channels. Immunohistochemistry shows PAX8+, CA9+, and CD10+. Which of the following molecular alterations is the hallmark driver of this tumor subtype?

A 58-year-old male smoker with hypertension presents with incidental discovery of a 6 cm left renal mass on CT imaging. The mass is solid, heterogeneously enhancing, and hypervascular. Histopathology reveals the structure marked **A** — polygonal tumor cells with clear cytoplasm arranged in nests. Which of the following best explains the molecular pathogenesis underlying this histologic appearance?

A 68-year-old man with a 40-year smoking history and hypertension is found to have a left renal mass on incidental CT imaging. Histopathological examination reveals nests of large cells with abundant clear cytoplasm separated by a delicate branching capillary network, as marked by **A** in the diagram. Which of the following molecular alterations is the PRIMARY driver of the characteristic hypervascular phenotype in this tumor?