On the contrary, no association could be found between BRCA1 gene hypermethylation and tumor histology (OR = 0.78: 95% CI: 0.59–1.03; p = 0.08, fixed effects model, Figure 2a), tumor grading (OR = 0.78: 95% CI: 0.46–1.32; p = 0.36, fixed effects model, Figure 2c), and breast cancer molecular classification (OR = 1.59: 95% CI: 0.68–3.72; p = 0.29, random effects model, Figure 2e). This evidence concerns the gene BRCA1 and breast cancer.