True about RCC is?
**Core Concept**
Clear cell renal cell carcinoma (RCC) is a type of kidney cancer characterized by the production of clear cells due to the accumulation of lipids and glycogen. This is often associated with mutations in the VHL gene, leading to the activation of hypoxia-inducible factor-alpha (HIF-alpha).
**Why the Correct Answer is Right**
The correct answer is related to the molecular pathogenesis of clear cell RCC. The VHL gene acts as a tumor suppressor by regulating the degradation of HIF-alpha. Mutations in the VHL gene result in the accumulation of HIF-alpha, which in turn upregulates genes involved in angiogenesis and glycolysis, contributing to tumor growth. The correct answer is linked to this molecular mechanism.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not directly relate to the molecular pathogenesis of clear cell RCC.
**Option B:** This option is incorrect as it is a characteristic of papillary RCC, not clear cell RCC.
**Option C:** This option is incorrect as it is a characteristic of chromophobe RCC, not clear cell RCC.
**Clinical Pearl / High-Yield Fact**
Clear cell RCC is the most common type of kidney cancer in adults, accounting for approximately 70-80% of cases. The VHL gene mutation is a key driver of this disease, and understanding its molecular pathogenesis is crucial for developing targeted therapies.
**Correct Answer: B. Clear cell RCC is associated with mutations in the VHL gene.**