Oxalate induces breast cancer

Area of Science:

• Oncology
• Biochemistry

Background:

• Microcalcifications are early indicators of breast cancer, crucial for early detection and conservative treatment.
• The formation mechanism of mammary microcalcifications remains largely unknown.
• Breast cancers with microcalcifications often indicate a poorer prognosis.

Purpose of the Study:

• To investigate the biological significance of oxalates in the breast tumor microenvironment.
• To determine the role of oxalates in breast cancer development and progression.

Main Methods:

• Combined Capillary Electrochromatography, histology, and gene expression (qRT-PCR) to analyze patient-matched normal and tumor breast tissues.
• Assessed oxalate concentration in human breast tissues.
• Tested the potential carcinogenicity of oxalate by inoculation into mice.

Main Results:

• Breast tumor tissues exhibited higher oxalate concentrations than adjacent non-pathological tissues.
• Oxalate was found to induce breast cell proliferation and stimulate the expression of the pro-tumorigenic gene c-fos.
• Oxalate injection into the mammary fatpad of mice generated highly malignant, undifferentiated fibrosarcoma-like tumors, but not when injected elsewhere.

Conclusions:

• Chronic exposure to oxalate promotes the transformation of normal breast epithelial cells into tumor cells.
• Oxalate induces proliferation and proto-oncogene (c-fos) expression in breast cancer cells.
• Oxalate exhibits carcinogenic effects in the mammary fatpad, suggesting that controlling oxalate may reduce breast cancer incidence.