Several research works concerning the tumorigenesis factors have confirmed the oconogenic viruses as a major cause of some cancers and other neoplastic growths. This field is full of arguments and controversial conclusions. Some of these arguments and conclusions are even related to a single virus. There are different study designs, populations, clinical and pathological criteria, social statuses of probands studied, etc., involved in these studies. Some of these studies even implicated other viruses responsible for cancers. These differences even led to contradictory conclusions, which can be noticed in today’s literature. However, there is a general agreement on the suspected roles played by viruses in initiating the development of cancer.
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