Each breast has 15 to 20 sections called lobes, which have many smaller sections called lobules. The lobes and lobules are connected by thin tubes called ducts. Reproduction and Development Development of the embryo. After successful fertilisation of the egg the embryo is formed. This is followed by the fetal period, during which the fetus develops.
Inheritance is the passing of hereditary traits from one generation to the next - genetics .
Worldwide 700,000 cases are diagnosed each year. The most common type of breast cancer that found in the cells of the breast ducts, other types include those of the lobes, and inflammatory breast cancer. If the cells are responsive to these hormones then these may be used to stop the lump growing. Further treatment depends on the stage of the cancer. Chemotherapy, surgery and radiotherapy may be required.