RAD51 and breast ductal adenocarcinoma: Ma and colleagues [16] detected an increase in RAD51 mRNA expression in Ductal Carcinoma In Situ-Invasive Ductal Carcinoma transition and high-tumour-grade breast cancers, while it has also been found that overexpression of RAD51 correlates with histological grading of Invasive Ductal Carcinoma [17].