Evidence map›Paper›PMID 42509465›Full record

ArticleBritish journal of cancer2026

FGFR4-associated APOBEC3 mutagenesis characterizes HER2-enriched subtype of human breast cancer.

Ju-Yul Jeong, Chae-Yi Kim, A-Reum Nam, Je-Yoel Cho

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Article in British journal of cancer, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

4 authors.

Ju-Yul JeongDepartment of Biochemistry, Brain Korea 21 Project and Research Institute for Veterinary Science, Seoul National University, College of Veterinary Medicine, Seoul, Republic of Korea.
Chae-Yi KimComparative Medicine Disease Research Center (CDRC), Science Research Center (SRC), Seoul National University, Seoul, Republic of Korea.
A-Reum NamComparative Medicine Disease Research Center (CDRC), Science Research Center (SRC), Seoul National University, Seoul, Republic of Korea.
Je-Yoel ChoDepartment of Biochemistry, Brain Korea 21 Project and Research Institute for Veterinary Science, Seoul National University, College of Veterinary Medicine, Seoul, Republic of Korea. jeycho@snu.ac.kr.ORCID http://orcid.org/0000-0003-1030-3577

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundCharacterising somatic mutation profiles in human breast cancer (HBC) is essential for understanding tumour progression and guiding therapeutic strategies.

methodsWe performed genomic and transcriptomic analyses to profile the mutational landscape of HBC. In addition to our primary analysis of HBC, we conducted comparative genomic analyses to evaluate the extent to which these mutational processes are recapitulated in canine mammary tumour (CMT), a widely proposed translational model.

resultsAPOBEC3 (A3)-associated mutations were extensive in HBC but largely absent in CMT, likely due to structural differences in A3 proteins and lower basal expression. Transcriptomic stratification of HBC by A3 activity uncovered that tumours with A3 activity showed a strong association with the PAM50-HER2-Enriched (HER2E) subtype, and FGFR4 was significantly correlated with the expression and enzymatic function of APOBEC3A/B.

conclusionsThese findings demonstrate that CMT is an unsuitable model for A3-mediated mutagenesis, emphasising the need to consider the limitations of cross-species mutational modelling in comparative oncology. Moreover, this study identifies a potential regulatory association between FGFR4 and A3, offering insights into the underlying mechanisms of A3-driven mutagenesis and suggesting that the FGFR4-A3 activity could be considered alongside other molecular biomarkers for the classification of the HER2E subtype.

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