Muir-Torre Syndrome.

Area of Science:

• Oncology
• Dermatology
• Genetics

Background:

• Muir-Torre syndrome (MTS) is an autosomal dominant disorder associated with an increased risk of sebaceous neoplasms and visceral malignancies, particularly colorectal, genitourinary, and breast cancers.
• The syndrome is typically caused by mutations in DNA mismatch repair (MMR) genes, leading to microsatellite instability and a predisposition to cancer.
• A strong family history of cancer is a key indicator for suspecting hereditary cancer syndromes like MTS.

Observation:

• A 64-year-old male diagnosed with MTS presented with a history of multiple sebaceous carcinomas and adenomas.
• He had a history of colon cancer (resection 17 years prior) and recently diagnosed urothelial carcinoma.
• The patient exhibited an extensive family history of various cancers, including colon, lung, bone, kidney, skin, and testicular cancers, with consanguineous parents.

Findings:

• The patient's family pedigree revealed a high prevalence of cancers across multiple generations and lineages.
• The affected family members had a spectrum of malignancies, consistent with Lynch syndrome-related cancers, often seen in MTS.
• The consanguinity in the parents may increase the risk of autosomal recessive conditions or compound heterozygosity, though MTS is typically autosomal dominant.

Implications:

• This case underscores the critical role of comprehensive family cancer history assessment and genetic counseling in patients with sebaceous neoplasms.
• Early diagnosis and genetic testing for DNA mismatch repair gene mutations are crucial for Lynch syndrome/MTS patients.
• Proactive surveillance protocols for both cutaneous and visceral malignancies are essential for affected individuals and their at-risk relatives.