The BRCA1 gene has been known since 1994, where Yoshio Miki, described its role in the inheritance of breast and ovarian cancer. Recently, we have been hearing a lot about the role of this gene in the development of Alzheimer's disease. BRCA1 is classified as a tumour suppressor gene and its role in the human body is still a great mystery. Perhaps it will help in the fight against dementia and contribute to the discovery of new therapeutic solutions?