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Frequent PIK3CA mutations in radial scars
Katie L Wolters1, Daphne Ang, Andrea Warrick
1*Department of Pathology †Knight Cancer Institute, Oregon Health & Science University, Portland, OR.
Summary
Activating PIK3CA gene mutations, common in breast cancer, were found in a high percentage of radial scars. This suggests a potential role for these mutations in the development of breast cancer.
Area of Science:
- Oncology
- Genetics
- Pathology
Background:
- Radial scars are benign breast lesions linked to increased breast cancer risk.
- Activating PIK3CA mutations are prevalent in invasive breast cancers but unstudied in radial scars.
Purpose of the Study:
- To investigate the presence and frequency of PIK3CA hotspot mutations in radial scars.
- To explore the potential role of PIK3CA mutations in radial scar pathogenesis and their association with breast cancer risk.
Main Methods:
- Analysis of 22 radial scars from 16 surgical cases.
- DNA extraction from lesional tissue followed by screening for PIK3CA hotspot mutations using PCR and mass spectrometry.
Main Results:
- PIK3CA mutations were detected in 14 out of 22 (63.6%) radial scars, significantly higher than in invasive breast cancer.
- Specific mutations included H1047R, G1049R, E542K, and E545K.
- Mutation frequency was higher in radial scars with atypia (83.3%) compared to those without (56.3%).
Conclusions:
- The high frequency of PIK3CA mutations in radial scars suggests their involvement in breast cancer development.
- Further research is needed to elucidate the precise role of PIK3CA mutations in radial scar pathogenesis and their link to breast cancer.
- These findings highlight the importance of PIK3CA mutation analysis in understanding breast lesion progression.
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