👉 Metasomatism is a medical term that refers to a state where an individual has a fusion of two or more different types of cells, such as somatic and endocrine cells. Metasomatism can occur in many disorders, including cancer, autoimmune diseases, and certain forms of neurodegenerative diseases. In some cases, metasomatism can lead to the development of tumors that are not typically associated with either type of cell.