Is BI-RADS category 4B an early stage of cancer?

Breast category 4B does not necessarily indicate early-stage cancer, but rather suggests the possibility of a malignant lesion.

The breast is a human tissue and an accessory gland of the skin. In males, breast tissue gradually regresses by around one and a half years of age; the gland contains ducts but lacks alveoli and lobular structure. In contrast, in females, breast tissue proliferates during puberty and becomes nearly mature after menstruation begins. Generally speaking, breast category 4B does not necessarily mean early cancer, but indicates a potential risk of malignancy. Breast category 4B refers to the detection of a breast nodule during ultrasound examination, classified as BI-RADS category 4. The BI-RADS category 4 is further subdivided into three subcategories—A, B, and C—and 4B specifically refers to the B subcategory, indicating an intermediate likelihood of malignancy, with a probability ranging from approximately 10% to 50%.

If a patient is diagnosed with breast category 4B, it is recommended to promptly visit a hospital for a biopsy to obtain a definitive diagnosis, followed by active treatment once confirmed.