Invasive ductal carcinoma IDC , sometimes called infiltrating ductal carcinoma, is the most common type of breast cancer. Carcinoma refers to any cancer that begins in the skin or other tissues that cover internal organs — such as breast tissue. Over time, invasive ductal carcinoma can spread to the lymph nodes and possibly to other areas of the body. According to the American Cancer Society, more than , women in the United States find out they have invasive breast cancer each year. Most of them are diagnosed with invasive ductal carcinoma.
Invasive Ductal Carcinoma (IDC) Breast Cancer: Johns Hopkins Breast Center
Learn about our expanded patient care options for your health care needs. IDC is the most common form of breast cancer, representing 80 percent of all breast cancer diagnoses. As with any breast cancer, there may be no signs or symptoms. A mammogram may reveal a suspicious mass, which will lead to further testing. A woman may also find a lump or mass during a breast self-exam.
Breast cancer is classified into different types based on how the cells look under a microscope. Most breast cancers are carcinomas, a type of cancer that begins in the linings of most organs. Ductal carcinoma in situ DCIS is characterized by cancerous cells that are confined to the lining of the milk ducts and have not spread through the duct walls into surrounding breast tissue. DCIS is the most common type of noninvasive breast cancer, with about 60, new cases diagnosed in the United States each year. About one in every five new breast cancer cases is ductal carcinoma in situ.
Breast cancers that have spread into surrounding breast tissue are known as invasive breast cancer. Most breast cancers are invasive, but there are different types of invasive breast cancer. The two most common are invasive ductal carcinoma and invasive lobular carcinoma.