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Testing Targeted Therapies in Cancer using Structural DNA Alteration Analysis and Patient-Derived Xenografts
Published on: July 25, 2020
Distinct genomic and immunologic tumor evolution in germline TP53-driven breast cancers
Nabamita Boruah1, David Hoyos2, Renyta Moses1
1Division of Hematology-Oncology, Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA.
Nature Communications
|May 21, 2026
Summary
Li-Fraumeni Syndrome (LFS) breast cancer (BC) often involves TP53 loss and chromosomal instability. Unlike sporadic BC, LFS-BC shows reduced p53 target gene activation and altered T-cell responses during tumor progression.
Area of Science:
- Oncology
- Genetics
- Immunology
Background:
- Li-Fraumeni Syndrome (LFS) is caused by pathogenic germline TP53 alterations.
- Breast cancer (BC) is the most prevalent cancer in females with LFS.
- Understanding LFS-BC is crucial for targeted therapies.
Purpose of the Study:
- To compare Li-Fraumeni Syndrome-associated breast cancer (LFS-BC) with sporadic premenopausal breast cancer.
- To identify key molecular and immunological differences in LFS-BC.
- To elucidate TP53-driven tumorigenesis in breast tissue.
Main Methods:
- Multimodal analysis of LFS-BC and sporadic BC.
- Genomic analysis for TP53 alterations and copy number variations.
- Gene expression profiling of p53 target genes.
- Immunohistochemistry for CD8+ T-cell infiltration and proliferation.
Main Results:
- LFS-BC predominantly shows biallelic TP53 loss, with ERBB2 amplification as the main oncogenic variant.
- LFS-BC exhibits a high burden of short amplified aneuploid segments compared to sporadic BC.
- Pro-apoptotic p53 target genes (BAX, TP53I3) are not upregulated in LFS-BC.
- LFS-BC has lower CD8+ T-cell infiltration but higher proliferating cytotoxic T-cells than sporadic BC.
- Tumor progression in LFS-BC correlates with increased chromosomal instability and decreased T-cell proliferation.
Conclusions:
- TP53 loss in LFS-BC drives distinct genomic and immune landscapes.
- Aberrant p53 pathway function impacts tumor progression and immune evasion in LFS-BC.
- These findings highlight critical events in mutant p53-driven breast tumorigenesis.
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