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A Case of Late-Onset Li-Fraumeni-like Syndrome with Unilateral Breast Cancer
Annals of Laboratory Medicine ; : 212-216, 2013.
Article in English | WPRIM | ID: wpr-144094
ABSTRACT
Li-Fraumeni syndrome (LFS) is a rare, inherited syndrome associated with increased risk of various early-onset tumors. Since the introduction of classic LFS criteria, various criteria have been proposed to include patients with incomplete LFS features, which make up Li-Fraumeni-like syndromes (LFL). Germline missense mutations of TP53 are the primary cause of LFS and LFL. Mutations mostly reside in the DNA-binding domain of the gene and have a dominant-negative effect (DNE) over alternate wild-type alleles. Germline TP53 mutation c.566C>T results in the missense mutation GCC (Ala) to GTC (Val) at codon 189 (A189V) and has been reported in a case of multiple primary colon tumors. Herein we report a second case of the same mutation in a breast cancer patient, who has familial history of late-onset malignancies. Due to the relatively late onset of malignancies, neither case fulfils previously defined criteria for the syndrome. Mutational analysis for breast tissue in this patient showed a loss of heterozygosity. These clinical features may suggest a relatively weak DNE of A189V compared to other TP53 mutations, and in silico predictions and in vitro findings of the function of A189V mutant protein are conflicting. Considering the increased risk of malignancies and the therapeutic implications for patients who have a TP53 mutation, care must be taken when treating those who are suspected of possessing cancer-prone traits due to TP53 mutation, especially when there is a family history of late-onset cancer with low penetrance.
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Full text: Available Index: WPRIM (Western Pacific) Main subject: Pedigree / Breast Neoplasms / Exons / Tumor Suppressor Protein p53 / Li-Fraumeni Syndrome / Sequence Analysis, DNA / Combined Modality Therapy / Mutation, Missense / Multimodal Imaging / Genotype Type of study: Prognostic study Limits: Adolescent / Adult / Female / Humans Language: English Journal: Annals of Laboratory Medicine Year: 2013 Type: Article

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Full text: Available Index: WPRIM (Western Pacific) Main subject: Pedigree / Breast Neoplasms / Exons / Tumor Suppressor Protein p53 / Li-Fraumeni Syndrome / Sequence Analysis, DNA / Combined Modality Therapy / Mutation, Missense / Multimodal Imaging / Genotype Type of study: Prognostic study Limits: Adolescent / Adult / Female / Humans Language: English Journal: Annals of Laboratory Medicine Year: 2013 Type: Article