Additional Study Information: The purpose of this registry is to keep track of people who are undergoing therapy for ductal carcinoma in situ (DCIS) and who are having molecular testing known as DCISionRT. A Registry is a databank of people who have something in common. Molecular testing looks at how certain genes are used by your tumor cells. The goal of this Registry is to help researchers understand the value of molecular testing in the choice of therapy for DCIS patients. The Registry will record information including the results of molecular testing on tumor tissue. This Registry will eventually contain information from thousands of people who are undergoing DCIS treatment.