Second Case of Tumors Associated With Heterozygous NTHL1 Variant

Area of Science:

• Genetics
• Oncology
• Molecular Biology

Background:

• Homozygous mutations in the NTHL1 gene are linked to increased cancer risk, particularly for colon and breast cancers, and define NTHL1 tumor syndrome (NTS), an autosomal recessive condition.
• The cancer risk associated with heterozygous NTHL1 mutations remains largely uncharacterized.
• Previous research documented a case of benign tumors in a patient with a heterozygous NTHL1 mutation.

Observation:

• This study presents a second case involving a patient with a heterozygous NTHL1 mutation.
• The patient developed a diverse range of tumors, including a gastrointestinal stromal tumor, pilocytic astrocytoma, tall cell papillary thyroid cancer, invasive ductal papilloma, and spinal tumors (nerve sheath tumors and hemangiomas).

Findings:

• The presented case demonstrates that heterozygous NTHL1 mutations can be associated with an increased risk of developing multiple, distinct types of cancer.
• The tumor spectrum observed in this patient with a heterozygous mutation suggests a potential overlap in clinical manifestation with NTHL1 tumor syndrome (NTS).

Implications:

• These findings suggest that heterozygous NTHL1 mutations may contribute significantly to cancer predisposition.
• Further research is warranted to elucidate the precise mechanisms by which heterozygous NTHL1 mutations influence tumorigenesis.
• Clinical surveillance and genetic counseling for individuals with heterozygous NTHL1 mutations may need to be reconsidered.