Childhood Cancer Childhood Cancer Glossary Clinical Terms Cancer - a groups of more than 100 diseases characterized by uncontrolled growth and spread of abnormal cells. Carcinoma - cancer of the epithelium.
Epithelial cells cover or line the internal organs, body surface, internal cavities and form glands.
Histology - microscopic identification of cells and tissue. These cells also occur in almost all tissues of the body, and lymphomas therefore may develop in a wide variety of organs. Metastasis - site in the body where cancer spread to from the primary cancer. This could be a spread to an adjacent organ or to an organ unconnected to the primary site. Primary Site or Primary Cancer - the site in the body where cancer began.