The prognosis of grade 3 breast cancer is not good, but it is not completely incurable. Breast cancer grade 3 is a classification based on the morphology of tumor tissues, which mostly refers to low differentiated breast cancer with strong metastasis and invasiveness, rapid development of the disease and greater difficulty in treatment, and relatively serious condition, and the overall clinical cure rate is not high, which should be analyzed in combination with the staging and type of the disease. Generally speaking, the five-year survival rate of early grade 3 breast cancer can still reach more than 80%, but if it is in the middle or late stage, it will be more difficult to treat, and the five-year survival rate may only be about 10%, and some patients may even be lower, so early detection and early treatment is the key.