Stages 0 and 1

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Stage 0               

Ductal carcinoma in situ (DCIS)- abnormal cells found in the lining of the breast duct.

  • Non-invasive.
  • It is unknown which areas, if any, will become invasive.

Lobular carcinoma in situ (LCIS)- abnormal cells are found in the lobules of the breast.

  • Non-invasive
  • Seldom becomes invasive.

Paget disease- abnormal cells found only in the nipple.


Stage 1

IA

  • Cancer has formed.
  • Tumor is 2 centimeters or smaller.
  • Has not spread outside of breast.

IB

  • Small clusters of cancer cells are found in lymph nodes or
  • No tumor or tumor is 2 centimeters or smaller.

 

 


Reference

National Cancer Institute at the National Institutes of Health