How much is the risk of ovarian cancer increased above normal in a woman with non autosomal dominant genotype with one first degree relative with ovarian cancer :
**Core Concept**
The risk of ovarian cancer in women with a family history of the disease is a complex multifactorial issue, influenced by both genetic and environmental factors. The presence of a first-degree relative with ovarian cancer increases the risk, but the magnitude of this increase depends on the genetic predisposition of the individual.
**Why the Correct Answer is Right**
Women with a first-degree relative (mother, sister, or daughter) with ovarian cancer have a 1.9- to 3.4-fold increased risk of developing ovarian cancer compared to the general population. This increased risk is primarily due to shared environmental and genetic factors, although the presence of specific genetic mutations such as BRCA1 and BRCA2 can significantly elevate the risk. The non-autosomal dominant genotype suggests that the risk is not solely attributed to a single dominant mutation, making the risk increase less pronounced compared to women with a known BRCA mutation.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not provided, so it cannot be evaluated.
**Option B:** Incorrect because the risk of ovarian cancer is not increased by a factor of 10 in women with a first-degree relative with ovarian cancer.
**Option C:** Incorrect because the risk of ovarian cancer is not doubled in women with a first-degree relative with ovarian cancer.
**Clinical Pearl / High-Yield Fact**
Women with a family history of ovarian cancer should be aware of the increased risk and discuss their individual risk assessment with a healthcare provider. This includes considering genetic testing for BRCA1 and BRCA2 mutations and undergoing regular screening with transvaginal ultrasound and CA-125 blood tests.
**Correct Answer:** B. 2.3 to 2.5 times