All of the following are predisposing factors for breast carcinoma except: September 2008
**Core Concept**
The question tests the understanding of risk factors associated with breast carcinoma, a malignancy arising from the epithelial cells of the breast. Various genetic, hormonal, and environmental factors contribute to the development of breast cancer.
**Why the Correct Answer is Right**
One of the key risk factors for breast carcinoma is a family history of the disease, particularly in first-degree relatives. This is due to the inheritance of genetic mutations in tumor suppressor genes such as BRCA1 and BRCA2, which increase the risk of breast and ovarian cancer. Other risk factors include early menarche, late menopause, nulliparity, and exposure to radiation.
**Why Each Wrong Option is Incorrect**
* **Option A:** Family history is a well-established risk factor for breast carcinoma. Individuals with a first-degree relative (mother, sister, or daughter) diagnosed with breast cancer have a higher risk of developing the disease.
* **Option B:** Radiation exposure is a known risk factor for breast carcinoma, particularly in individuals exposed to high doses of radiation at a young age.
* **Option C:** Hormonal factors, such as early menarche and late menopause, increase the risk of breast carcinoma. This is due to the prolonged exposure to estrogen and progesterone, which stimulate the growth of breast cells.
**Clinical Pearl / High-Yield Fact**
A family history of breast cancer is a significant risk factor, with a first-degree relative increasing the risk by 2-3 times. This emphasizes the importance of a thorough family history in assessing an individual's risk of breast carcinoma.
**Correct Answer: A. Family history is a predisposing factor for breast carcinoma.**