Ductal carcinoma in situ (DCIS) is the growth of abnormal cells in the milk ducts of the breast. It’s an early form of noninvasive breast cancer, sometimes called precancer. Noninvasive means that the cells have not and are not going to spread into surrounding tissue. But without treatment, some cases of DCIS will change and turn into invasive breast cancer. There’s no way to know whether this will happen in your case.
The goal of treatment is to prevent DCIS from turning into invasive breast cancer. Your treatment options depend on the size, grade, and location of the cancer and on other factors. The most common treatment options are:
- Breast-conserving surgery (lumpectomy), usually followed by radiation treatment. This surgery tries to change the breast as little as possible while removing the area of DCIS.
- Mastectomy. This surgery removes the whole breast. Most people don’t need radiation after the surgery.
There are cases in which breast-conserving surgery is not an option. But most likely the choice will be up to you. There are good reasons for choosing either option.
No matter which surgery you have, your doctor may recommend hormone therapy for several years after if your cancer is hormone-receptor positive and HER2-negative. (Ask your doctor if you’re not sure what type you have.) Hormone therapy with tamoxifen or other medicines reduces the risk of you getting a new breast cancer.