• ductal carcinoma in situ (DCIS or intraductal carcinoma)
• lobular carcinoma in situ (LCIS) and may also be called:
  
  
  • breast cancer in situ
  • carcinoma in situ
  • stage 0 breast cancer

Patients with this condition have a 25 percent chance of developing breast cancer in either breast in the next 25 years.

Stage II is subdivided into stages IIA and IIB: 

• Stage IIA is defined by either of the following:
  
  
  • The cancer is no larger than 2 centimeters (about one inch) but has spread to the lymph nodes under the arm (the axillary lymph nodes).
    
    or
    
    
  • The cancer is between 2 and 5 centimeters (from 1 to 2 inches), but has not spread to the lymph nodes under the arm.
    
    
• Stage IIB is defined by either of the following:
  
  
  • The cancer is between 2 and 5 centimeters (1 to 2 inches) and has spread to the lymph nodes under the arm.
    
    or
    
    
  • The cancer is larger than 5 centimeters (larger than 2 inches), but has not spread to the lymph nodes under the arm.

• Stage IIIA is defined by either of the following:
  
  
  • The cancer is smaller than 5 centimeters and has spread to the lymph nodes under the arm, and the lymph nodes are attached to each other or to other structures.

  or

  • The cancer is larger than 5 centimeters and has spread to the lymph nodes under the arm.
    
    
• Stage IIIB is defined by either of the following:
  
  
  • The cancer has spread to tissues near the breast (skin or chest wall, including the ribs and the muscles in the chest).

  or
  
  
  

  • The cancer has spread to lymph nodes inside the chest wall along the breast bone

• The cancer has spread to other organs of the body, most often the bones, lungs, liver, or brain.

or

• The tumor has spread to the lymph nodes inside the neck, near the collarbone.