The study by Bastos et al. on Caucasians from the Portuguese population showed a trend toward increased risk of thyroid cancer for people who are homozygous for the RAD51 rs180132 polymorphic allele variant (adjusted OR = 1.9; 95% CI = 1.0–3.5; p = 0.057) [44]. This evidence concerns the gene RAD51 and thyroid cancer.