Transgenic animals are used for testing the safety of vaccines, drugs, studying diseases, like cystic fibrosis, haemophilia, cancer and Alzheimer's disease and study of complex growth factors such as insulin-like growth factors and have provided new insights into the genetic origin of certain diseases and have improved our understanding of pathological processes on the cellular level.
Transgenic animals were used to study aspects of tumour growth, immune regulation, growth of the cardiovascular system and atherosclerosis. These studies provided new insights into the genetic roots of certain diseases and strengthened our understanding of cellular pathological processes.