Cancer Outcomes in DCIS Patients Without Locoregional Treatment

Background The vast majority of women diagnosed with ductal carcinoma in situ (DCIS) undergo treatment. Therefore, the risks of invasive progression and competing death in the absence of locoregional therapy are uncertain. Methods We performed survival analyses of patient-level data from DCIS patients who did not receive definitive surgery or radiation therapy as recorded in the US National Cancer Institute’s Surveillance, Epidemiology, and End...