Mutation in p53 gene is associated with which malignancy ?
**Core Concept**
The p53 gene is a tumor suppressor gene that plays a crucial role in regulating the cell cycle, apoptosis, and DNA repair. Mutations in the p53 gene can lead to loss of its function, resulting in uncontrolled cell growth and cancer development.
**Why the Correct Answer is Right**
The p53 gene is often referred to as the "guardian of the genome" due to its critical role in maintaining genomic stability. Mutations in the p53 gene are associated with a wide range of cancers, including Li-Fraumeni syndrome, which is characterized by a high risk of developing multiple types of cancer, including breast cancer, brain tumors, and leukemia. The most common malignancy associated with p53 mutations is Li-Fraumeni syndrome-related **breast cancer**, although other malignancies like **osteosarcoma**, **adrenocortical carcinoma**, and **brain tumors** are also commonly seen.
**Why Each Wrong Option is Incorrect**
* **Option A:** While p53 mutations are associated with various cancers, they are not typically linked to **prostate cancer**. Prostate cancer is more commonly associated with mutations in the BRCA2 gene.
* **Option B:** **Glioblastoma** is a type of brain tumor, but it is not the most common malignancy associated with p53 mutations. While p53 mutations have been found in some cases of glioblastoma, they are not as strongly linked to this cancer as they are to Li-Fraumeni syndrome-related breast cancer.
* **Option C:** **Colorectal cancer** is a common malignancy, but it is not typically associated with p53 mutations. Instead, colorectal cancer is often linked to mutations in the APC gene.
**Clinical Pearl / High-Yield Fact**
The Li-Fraumeni syndrome is a rare genetic disorder characterized by a high risk of developing multiple types of cancer, including breast cancer, brain tumors, and leukemia. Patients with Li-Fraumeni syndrome often have a family history of cancer and may develop cancer at a young age.
**Correct Answer:** C.