We comprehensively analyzed by minigene assays several BC susceptibility genes, such as BRCA2 [25], along with RAD51C, RAD51D, PALB2, and ATM within the framework of the European Project BRIDGES (Breast Cancer Risk after Diagnostic Gene Sequencing; https://bridges-research.eu/, accessed on 12 July 2022) [26,27,28,29]. The gene discussed is ATM; the disease is breast cancer.