Molecular Mechanisms of Sebaceous Neoplasia in Lynch Syndrome

Sebaceous neoplasia arising in the context of Lynch syndrome reflects a convergence of inherited DNA repair defects and tumour‐specific mutational processes. Germline pathogenic variants in key mismatch repair genes—most commonly MSH2 and MLH1—render cells unable to correct replication errors at repetitive DNA sequences, giving rise to microsatellite instability. In sebaceous glands this leads to a characteristic accumulation of frameshift mutations in both coding and non‐coding regions, driving clonal expansion of atypical sebocytes. Tumourigenesis frequently involves a “second hit” in the wild-type allele through promoter hypermethylation or somatic loss of heterozygosity, culminating in complete loss of MMR function. The resulting high mutational burden generates neoantigens that prime local immune surveillance but may also select for immune-evasive phenotypes. Histologically, affected lesions range from benign adenomas to aggressive carcinomas, and their molecular profiles inform strategies for early detection, genetic counselling and targeted therapies. Recognition of sebaceous tumours as cutaneous sentinel events in Lynch syndrome has global significance, enabling cascade testing, personalised chemoprevention―notably with low-dose aspirin―and consideration of immune-checkpoint inhibitors in advanced cases.

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Technical terms

Lynch syndrome: Hereditary cancer predisposition caused by germline mutations in DNA mismatch repair genes, predisposing to colorectal, endometrial and extra-colonic tumours, including sebaceous neoplasms.

Muir-Torre syndrome: Variant of Lynch syndrome characterised by at least one sebaceous skin tumour and one internal malignancy, reflecting underlying MMR gene mutations.

Mismatch repair (MMR): DNA repair pathway that corrects base–base mismatches and insertion–deletion loops arising during replication.

Microsatellite instability (MSI): Sequence variation at short tandem repeat loci due to defective MMR, leading to increased mutation rates and neoantigen formation.

References

1. Genetic Drivers in Sebaceous Neoplasms: A Review of Germline and Somatic Mutations and Their Role in Treatment and Management Strategies. Cancers (2025).
2. Clinical and Molecular Features of Skin Malignancies in Muir-Torre Syndrome. Genes (2021).
3. Characterization of sebaceous and non-sebaceous cutaneous manifestations in patients with lynch syndrome: a systematic review. Familial Cancer (2022).