An estrogen-induced enzyme present in breast tissue and in other cells that helps break down tissue. Large quantities of Cathepsin-D in breast tissue may indicate a high level of invasion into surrounding healthy tissue. A mass of protoplasm containing a nucleus or nuclear material. A cell is the unit of structure of all animals and plants. Cells and cell products make up all the tissues of the body.
Cells originate only from pre-existing cells, meaning new cells arise by cell division.
The growth and development of cells result from the increase in numbers of cells into different types of tissues. The sequence of biochemical and physical events that happen during the growth of cells. In studies of tissue culture, these cyclic changes are divided into specific periods or phases, including DNA synthesis or S phase. An area of normal tissue that surrounds cancerous tissue, as seen during examination under a microscope. A type of early breast cancer starting in the breast ducts.