Estrogen A female hormone. Fecal occult blood test Commonly called a stool guaiac. A test to check for hidden blood in stool. In early studies of gene therapy for cancer, researchers are trying to improve the body's natural ability to fight the disease or to make the tumor more sensitive to other kinds of therapy. Hormones Chemicals produced by glands in the body.
Hormones control the actions of certain cells or organs.
Hormone therap y Treatment that prevents certain cancer cells from getting the hormones they need to grow. Tomoxifen Imaging Procedures that produce pictures of areas inside the body. The complex group of cells and organs that defends the body against infection and disease. Immunotherapy See Biological therapy. Impotence Inability to have an erection.