An example of a sporadic disease is breast cancer. Other examples are sporadic fatal insomnia and sporadic Creutzfeldt-Jakob disease. Sporadic diseases are diseases that occur in the apparent absence of any environmental or inherited cause.
Breast cancer can be sporadic, or it can occur as an inherited disorder. Most cases of breast cancer are sporadic. Most inherited cases are linked to mutations of the BRCA1 and BRCA2 genes.
Fatal insomnia can occur as a sporadic disease or as an inherited disorder called familial fatal insomnia.
Creutzfeldt-Jakob disease can occur as a sporadic form or as an inherited disorder. It can also be acquired by exposure to brain tissue.