Pathway-based analysis of breast cancer

Area of Science:

• Oncology
• Molecular Biology
• Genomics

Background:

• Breast cancer pathogenesis involves more than just HER2 and ER pathways.
• Identifying additional altered pathways may lead to novel therapeutic strategies.

Purpose of the Study:

• To comprehensively analyze altered cancer pathway-related genes and proteins in breast cancer.
• To identify novel therapeutic targets by understanding pathway dysregulation.

Main Methods:

• Analyzed mRNA expression of 1243 cancer pathway genes in 13 invasive ductal carcinoma and 5 benign breast tissues using real-time PCR.
• Measured protein and phosphoprotein levels of 131 cancer pathway-related molecules in 33 paired breast cancer samples using a Protein Pathway Array.

Main Results:

• Significant differences in mRNA expression were observed between benign and cancer tissues, with some genes uniquely expressed in either.
• 57 proteins were significantly differentiated between tumor and normal tissues, with notable discrepancies between mRNA and protein expression.
• Pathway analysis revealed over 15 altered pathways, with p53, IL17, HGF, NGF, PTEN, and PI3K/AKT pathways shared between mRNA and protein data.

Conclusions:

• Breast cancer exhibits widespread pathway dysregulation at both mRNA and protein levels.
• mRNA expression levels do not consistently correlate with protein levels, indicating complex regulatory mechanisms.