The stage of a cancer tells you how big it is and whether it has spread. The type tells which type of cell the cancer started from and the grade means how abnormal the cells look under the microscope.
Find out about the different staging systems for breast cancer and about breast cancer grading.
Find out about tumour, node and metastasis (TNM) staging for breast cancer.
The number system for breast cancer staging divides cancers into 4 groups, from 1 to 4.
Read about the different types of breast cancer, including breast cancer in men, and conditions related to breast cancer.