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Difficulty: MediumGynecologic Oncology

A clinical geneticist is discussing screening and prophylactic strategies with several women who have strong family histories of malignancy. For each described genetic mutation and associated gynecologic cancer risk profile, identify the correct corresponding hereditary syndrome.

  • Autosomal dominant mutation in DNA mismatch repair genes (e.g., MSH2, MLH1) conferring a 40-60% lifetime risk of endometrial cancer as well as an increased risk of ovarian cancer.Lynch syndrome
  • Autosomal dominant mutation in a tumor suppressor gene on chromosome 17q21 conferring a 40-50% lifetime risk of high-grade serous ovarian cancer.BRCA1-associated hereditary syndrome
  • Autosomal dominant mutation in a tumor suppressor gene on chromosome 13q12 conferring a 15-20% lifetime risk of ovarian cancer, notably associated with male breast cancer in the family tree.BRCA2-associated hereditary syndrome
  • Autosomal dominant mutation in the PTEN gene characterized by macrocephaly, mucocutaneous lesions, and an elevated risk of early-onset endometrial cancer.Cowden syndrome
  • Autosomal dominant mutation in the STK11 gene manifesting with gastrointestinal polyposis, perioral lentigines, and a specific risk for ovarian sex cord tumors with annular tubules.Peutz-Jeghers syndrome

Answer

The genetic mutation profiles correctly pair with their respective hereditary syndromes based on the specific genes involved (mismatch repair, BRCA1/2, PTEN, STK11) and their distinct pattern of gynecologic and extragynecologic malignancies.
Gynecologic malignancies are frequently associated with specific germline mutations. Recognizing the extragynecologic manifestations and the specific genes involved (such as mismatch repair genes in Lynch syndrome, PTEN in Cowden syndrome, and STK11 in Peutz-Jeghers syndrome) is essential for identifying these hereditary syndromes and initiating appropriate screening and prophylactic surgical interventions.

Step-by-Step Solution

1
Identify the syndrome associated with mismatch repair gene mutations (MSH2, MLH1, etc.).
This profile corresponds to Lynch syndrome.
Lynch syndrome causes hereditary nonpolyposis colorectal cancer and has endometrial cancer as its most common extracolonic malignancy.
2
Differentiate between the chromosome 17 and chromosome 13 mutations associated with ovarian cancer.
Chromosome 17 mutations correspond to BRCA1 (higher ovarian cancer risk), while chromosome 13 mutations correspond to BRCA2 (strongly associated with male breast cancer).
BRCA1 and BRCA2 have distinct chromosomal locations and differing penetrance profiles for ovarian cancer and male breast cancer.
3
Identify the syndrome linked to PTEN mutations and endometrial cancer.
This describes Cowden syndrome.
Cowden syndrome is a PTEN hamartoma tumor syndrome characterized by macrocephaly, mucocutaneous findings, and high risk of endometrial, breast, and follicular thyroid cancers.
4
Identify the syndrome associated with STK11 mutations and sex cord tumors.
This describes Peutz-Jeghers syndrome.
Peutz-Jeghers syndrome uniquely presents with mucocutaneous lentigines, gastrointestinal hamartomas, and a specific risk for ovarian sex cord tumors with annular tubules (SCTAT).

Key Concept

Hereditary Cancer Syndromes in Gynecologic Oncology
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Topics

Gynecologic Oncology

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