How Different are the Cancer Cells from Normal Cells?

Experts call this "grade." They compare cancer cells to normal breast cells. Based on these comparisons, they give a "grade" to the cancer.

There are three cancer grades:

• Grade 1 (Low Grade or Well Differentiated):
  
  Grade 1 cancer cells still look a lot like normal cells. They are usually slowgrowing.
• Grade 2 (Intermediate/Moderate Grade or Moderately Differentiated):
  
  Grade 2 cancer cells do not look like normal cells. They are growing somewhat faster than normal cells.
• Grade 3 (High Grade or Poorly Differentiated):
  
  Grade 3 cancer cells do not look at all like normal cells. They are fast-growing.