An oncogene is a gene that has the potential to cause cancer. In tumor cells, these genes are often mutated, or expressed at high levels.
Illustration of how a normal cell is converted to a cancer cell, when an oncogene becomes activated
An oncovirus or oncogenic virus is a virus that can cause cancer. This term originated from studies of acutely transforming retroviruses in the 1950–60s, when the term oncornaviruses was used to denot
Oncogene
…cancer in animals when they are introduced through viral infection, which carries an activated version of a proto-oncogene from a prior host cell (an oncovirus). Another method for identifying oncogenes is to look for genes that are activated by mutations in human cancer cells or by chromosomal translocations…
A micrograph showing cells with abnormal p53 expression (brown) in a brain tumor
Kaposi's sarcoma is a cancer that can form masses in the skin and is caused by the Kaposi's sarcoma-associated herpesvirus (KSHV), also called HHV-8.
Major capsid protein L1 pentamer, Human papillomavirus 11
Rabbit with Shope papilloma virus infection