During a pelvic examination, a gynecologist discovers an adnexal mass in a 32 year old woman. Resection of the mass demonstrates a malignant ovarian tumor. The tumor suppressor gene strongly associated with this tumor is also associated with cancer of which other organ or tissue?
## Core Concept
The question revolves around identifying a tumor suppressor gene associated with malignant ovarian tumors and another organ or tissue's cancer. The key concept here involves understanding the genetic underpinnings of ovarian cancer, specifically focusing on tumor suppressor genes.
## Why the Correct Answer is Right
The tumor suppressor gene strongly associated with ovarian cancer is **BRCA1**. BRCA1 (BReast CAncer 1) is a human gene that produces a protein responsible for repairing damaged DNA and thus plays a crucial role in maintaining the genetic material's stability. Mutations in the BRCA1 gene are linked to an increased risk of breast and ovarian cancers. The association of BRCA1 with breast cancer is well-established, making option **B. Breast** the correct answer. The mechanism involves the loss of function of the BRCA1 protein, leading to genomic instability and increased cancer risk.
## Why Each Wrong Option is Incorrect
- **Option A: Skin** - While certain genetic mutations can increase the risk of skin cancers, BRCA1 is not specifically associated with skin cancer risk.
- **Option C: Colon** - The primary genetic associations with colon cancer involve different genes, such as APC (adenomatous polyposis coli), MLH1, MSH2, MSH6, and PMS2, which are related to familial adenomatous polyposis (FAP) and Lynch syndrome, respectively.
- **Option D: Brain** - There are specific genetic syndromes associated with brain tumors, such as NF1 and NF2 (neurofibromin 1 and 2) for neurofibromatosis types 1 and 2, respectively. BRCA1 is not directly associated with brain cancer.
## Clinical Pearl / High-Yield Fact
A crucial clinical pearl is that women with a family history of breast or ovarian cancer should undergo genetic counseling and possible testing for BRCA1 and BRCA2 mutations. This is particularly relevant for individuals of Ashkenazi Jewish descent, where the prevalence of BRCA1 and BRCA2 mutations is higher.
## Correct Answer: B. Breast