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Nucleic Acid Studies on the Pathogenesis of Leukaemia

Recent work has lent strong support for the viral hypothesis of pathogenesis of human leukaemia. In laboratory animals both horizontal transmission from one individual to another by inoculation of leukaemia virus in the newborn, and vertical transmission through subsequent generation, have been shown to occur. With some animal leukaemias, and in general in human leukaemia, virus‐like particles cannot be detected by the electron microscope. It is generally accepted, however, that oncogenic virus infection can be transmitted through viral nucleic acids alone. Although oncogenic DNA viruses such as the Ebstein‐Barr virus might be the agent of Burkitt's lymphoma, tumour viruses which cause leukaemia in animals are usually RNA, and RNA viruses are the more likely candidates as viral agents for human leukaemia.