Association between folate metabolism polymorphisms and breast cancer: a case-control study

Area of Science:

• Genetics and Epidemiology
• Molecular Biology
• Oncology

Background:

• Folate metabolism gene polymorphisms are implicated in various cancers.
• Understanding these genetic factors and their interaction with lifestyle is crucial for breast cancer risk assessment.

Purpose of the Study:

• To investigate the association between MTHFR, MTR, and MTRR gene polymorphisms and breast cancer risk.
• To examine the interaction of these polymorphisms with tobacco and alcohol consumption.
• To evaluate the association with clinicopathological variables.

Main Methods:

• Case-control study involving 606 Brazilian women (128 breast cancer patients, 478 controls).
• Genotyping of MTHFR (C677T, A1298C), MTR (A2756G), and MTRR (A66G) polymorphisms using PCR-RFLP and real-time PCR.
• Statistical analysis to determine odds ratios (OR) and confidence intervals (CI).

Main Results:

• Age ≥50 years (OR: 2.65) and alcohol consumption (OR: 1.76) were associated with increased breast cancer risk.
• MTHFR A1298C polymorphism showed a reduced risk in codominant (CC OR: 0.22), recessive (OR: 0.22), and log-additive (OR: 0.70) models.
• No significant associations were found for MTHFR C677T, MTR, or MTRR polymorphisms with breast cancer risk.

Conclusions:

• Age and alcohol consumption are significant risk factors for breast cancer in this population.
• The MTHFR A1298C polymorphism may offer a protective effect against breast cancer.
• This study provides novel insights into folate pathway gene polymorphisms and breast cancer in a specific Brazilian region.