Sebaceomas in a Muir-Torre-like Phenotype in a Patient with MUTYH-Associated Polyposis

Area of Science:

• Genetics
• Oncology
• Dermatology

Background:

• MUTYH-associated polyposis (MAP) is an inherited disorder caused by mutations in the MUTYH gene, a key player in DNA base excision repair.
• MAP increases the risk of colorectal adenomas and cancer due to unrepaired oxidative DNA damage.
• Muir-Torre syndrome, a variant of Lynch syndrome, is characterized by sebaceous skin neoplasms and an elevated risk of gastrointestinal cancers.

Observation:

• A patient presented with multiple sebaceous tumors, a phenotype typically associated with Muir-Torre syndrome.
• Genetic analysis revealed the patient had MUTYH-associated polyposis (MAP).

Findings:

• This case illustrates a rare presentation of MAP with a Muir-Torre-like phenotype, characterized by multiple sebaceous neoplasms.
• The findings suggest a potential overlap or similar clinical presentation between MAP and Muir-Torre syndrome, despite different genetic underpinnings.

Implications:

• Patients with multiple sebaceous neoplasms should be evaluated for both Lynch syndrome and MUTYH-associated polyposis.
• Genetic testing for MAP is crucial in individuals presenting with sebaceous tumors, even without a family history of colorectal cancer.
• This case broadens the understanding of clinical manifestations associated with DNA repair gene mutations.