The KTB is a repository bank of whole blood, DNA, plasma, serum and frozen human breast tissue. The donors to this repository are volunteers. What sets the KTB apart from all other tissue and blood repositories is that the vast majority of our donors are without evidence of breast cancer. Each sample is annotated with detailed medical information about the donor. Even though donors will not benefit directly from their donation, they are providing an invaluable resource to enable research to maximize its potential today and in generations to come.