Grade is a “score” that tells you how different the cancer cells’ appearance and growth patterns are from those of normal, healthy breast cells. Your pathology report will rate the cancer on a scale from 1 to 3: Grade 1 or low grade (sometimes also called well differentiated): Grade 1 cancer cells look a little bit different from normal cells, and they grow in slow, well-organized patterns. Not that many cells are dividing to make new cancer cells. Grade 2 or intermediate/moderate grade (moderately differentiated): Grade 2 cancer cells do not look like normal cells and are growing and dividing a little faster than normal. Grade 3 or high grade (poorly differentiated): Grade 3 cells look very different from normal cells. They grow quickly in disorganized, irregular patterns, with many dividing to make new cancer cells.