Loss of ‘Y’ chromosome is associated with which of the following types of renal cell carcinoma (RCC)?
**Core Concept**
Loss of the Y chromosome is a cytogenetic abnormality that can be detected in certain types of renal cell carcinoma (RCC). This phenomenon is often observed in the context of chromosomal instability and genetic alterations that contribute to tumorigenesis.
**Why the Correct Answer is Right**
The correct answer is associated with papillary renal cell carcinoma (RCC), specifically type 1. The loss of the Y chromosome is a characteristic genetic feature of type 1 papillary RCC. This type of RCC accounts for approximately 15% of all RCC cases and is often associated with a better prognosis compared to other subtypes. The loss of the Y chromosome is thought to occur due to the inactivation of the centromere-specific kinetochore protein, CENP-A, which is essential for proper chromosome segregation.
**Why Each Wrong Option is Incorrect**
* **Option A:** Chromophobe RCC is characterized by large cells with pale cytoplasm and a low nuclear-to-cytoplasmic ratio, but it is not typically associated with loss of the Y chromosome.
* **Option B:** Clear cell RCC is the most common subtype of RCC, accounting for approximately 70-80% of cases, but it is not characteristically associated with loss of the Y chromosome.
* **Option D:** Collecting duct RCC is a rare subtype of RCC, but it is not typically associated with loss of the Y chromosome.
**Clinical Pearl / High-Yield Fact**
It is essential for pathologists and clinicians to recognize the distinct cytogenetic and histopathological features of different RCC subtypes, as this information can have significant implications for patient prognosis and treatment.
**Correct Answer:** C.