Breast hyperplasia is generally divided into six grades: Grade 1 is negative; Grade 2 is simple breast hyperplasia; Grade 3 is a benign lesion with less than 2 percent risk of malignancy; Grade 4 is subdivided into ABC, where Grade A is mild with 95% being benign, Grade B is moderately suspicious of malignancy, and Grade C has a relatively high degree of malignancy, with about 95% being malignant; Grade 5 has 98% chance of being breast cancer; Grade 6 involves pathological biopsy to confirm the diagnosis of breast cancer lesions.