Trientine: An ethylenediamine derivative used as stabilizer for EPOXY RESINS, as ampholyte for ISOELECTRIC FOCUSING and as chelating agent for copper in HEPATOLENTICULAR DEGENERATION.X-Ray Therapy: Medical treatment involving the use of controlled amounts of X-Rays.Rats, Inbred LEC: A cinnamon-colored strain of Long-Evans rats which carries a mutation causing fulminant hepatitis and jaundice, with an associated gross accumulation of copper in the liver. This strain is a model for Wilson's Disease (see HEPATOLENTICULAR DEGENERATION).Chelating Agents: Chemicals that bind to and remove ions from solutions. Many chelating agents function through the formation of COORDINATION COMPLEXES with METALS.Hepatolenticular Degeneration: A rare autosomal recessive disease characterized by the deposition of copper in the BRAIN; LIVER; CORNEA; and other organs. It is caused by defects in the ATP7B gene encoding copper-transporting ATPase 2 (EC 184.108.40.206), also known as the Wilson disease protein. The overload of copper inevitably leads to progressive liver and neurological dysfunction such as LIVER CIRRHOSIS; TREMOR; ATAXIA and intellectual deterioration. Hepatic dysfunction may precede neurologic dysfunction by several years.Fibrosarcoma: A sarcoma derived from deep fibrous tissue, characterized by bundles of immature proliferating fibroblasts with variable collagen formation, which tends to invade locally and metastasize by the bloodstream. (Stedman, 25th ed)Copper: A heavy metal trace element with the atomic symbol Cu, atomic number 29, and atomic weight 63.55.Specific Pathogen-Free Organisms: Animals or humans raised in the absence of a particular disease-causing virus or other microorganism. Less frequently plants are cultivated pathogen-free.