Grading of breast cancer
Grading refers to the appearance of the cancer cells under the microscope. The grade gives an idea of how quickly the cancer may develop. There are three grades: grade 1 (low-grade), grade 2 (moderate or intermediate grade) and grade 3 (high‑grade). Low-grade means that the cancer cells look very like the normal cells of the breast. These cancer cells are usually slow-growing and less likely to spread. In high-grade tumours the cells look very abnormal. They are more likely to grow quickly and to spread.