Slide show: Stages of breast cancer
Illustration of stage I breast cancer
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You have stage I breast cancer if all of the following are true:

  • The tumor is no more than 2 centimeters (3/4 inch) in diameter — about the size of a peanut without the shell.
  • The cancer hasn't spread to your lymph nodes.
  • The cancer hasn't spread outside your breast.
See more Multimedia Feb. 06, 2015