<P> A hormone receptor is a receptor molecule that binds to a specific hormone . Hormone receptors are a wide family of proteins made up of receptors for thyroid and steroid hormones, retinoids and Vitamin D, and a variety of other receptors for various ligands, such as fatty acids and prostaglandins . There are two main classes of hormone receptors . Receptors for peptide hormones tend to be cell surface receptors built into the plasma membrane of cells and are thus referred to as trans membrane receptors . An example of this is insulin . Receptors for steroid hormones are usually found within the cytoplasm and are referred to as intracellular or nuclear receptors, such as testosterone . Upon hormone binding, the receptor can initiate multiple signaling pathways which ultimately lead to changes in the behavior of the target cells . </P> <P> Hormonal therapy and hormone receptors play a very large part in breast cancer treatment (therapy is not limited to only breast cancer). By influencing the hormones, the cells' growth can be changed along with its function . These hormones can cause cancer to not survive in the human body . </P>

The targets of steroid hormones tend to be
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