Clinical Implications of Rabphillin-3A-Like Gene Alterations in Breast Cancer
Balananda-Dhurjati Kumar Putcha1, Xu Jia1, Venkat Rao Katkoori1
1Department of Pathology, University of Alabama at Birmingham, Birmingham, Alabama, United States of America.
Plos One
|June 13, 2015
Summary
Genetic alterations in the rabphagphilin-3A-like (RPH3AL) gene are linked to aggressive breast cancer. Loss of heterozygosity (LOH) in RPH3AL correlates with poor patient survival and advanced disease characteristics.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- The rabphagphilin-3A-like (RPH3AL) gene is a putative tumor suppressor.
- Understanding its role in breast cancer is crucial for developing targeted therapies.
Purpose of the Study:
- To evaluate the clinical significance of genetic alterations in the RPH3AL gene in breast cancers.
- To correlate RPH3AL alterations with clinicopathological features and patient survival.
Main Methods:
- DNA and RNA were extracted from formalin-fixed, paraffin-embedded (FFPE) breast cancers and normal tissues.
- Loss of heterozygosity (LOH) at RPH3AL and TP53 loci was assessed.
- RPH3AL sequencing, SNP genotyping, and expression analysis (RNA and protein) were performed.
Main Results:
- Loss of heterozygosity (LOH) at the RPH3AL locus was observed in 80 of 121 cancers and associated with nodal metastasis, advanced stage, large tumor size, and poor survival.
- Patients with LOH at both RPH3AL and TP53 loci had significantly shorter survival.
- Low RPH3AL RNA and protein expression were detected in cancers compared to normal tissues.
Conclusions:
- Genetic alterations in RPH3AL, including LOH and mutations, are associated with aggressive breast cancer behavior.
- RPH3AL alterations are a significant indicator of poor patient survival in breast cancer.
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