ER

Formalin-fixed, paraffin embedded tissue block or cell block, or 1 unstained charged slide for each test requested plus 3-4 additional unstained slides cut at 4 microns. Adequate space on each slide for control tissue is required.

SP1 recognizes human estrogen receptor alpha. Estrogen receptor is most frequently used as a prognostic marker in breast cancer, and is also used in a panel of antibodies for the work up of carcinomas of unknown primary.