[Viruses and malignant diseases]

Although we live in the age of fast scientific progress, what causes malignant diseases in humans is still unknown. The idea of viral etiology of malignant diseases is 80 years old, but during the last years this connection has been undoubtedly proved in some viral infections. There are numerous diseases of viral etiology possibly connected with malignomas in humans. However, literature data point to the fact that this connection has not been proved for certain. Fast development of antiviral therapy and reliable proofs about oncogenic effects of certain viruses should open possibilities for adequate therapeutic approaches to diseases most often lethal.