Human endogenous retrovirus (HERVs) integrated in the human genome millions of years ago and became a stable part of the inherited genetic material. Most of these HERVs are dysfunctional due to numerous mutations and thus making it impossible to generate a full, infectious retrovirus particle from a single genetic locus. However, many HERVs are still exceptionally well preserved and maintain Open Reading Frames encoding functional viral proteins. The permanence of HERV´s genes along evolution

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... ggests that these elements have proven beneficial to human survival. In this regard, the expression of certain HERV proteins is implicated in important physiological functions, such as placental development. Nevertheless, reactivation of HERVs has frequently been observed in a variety of human tumors suggesting their potential to contribute to malignant progression. Considering the role of HERVs in the carcinogenesis process, the purpose of this mini review is to deepen into HERVs expression and its possible implication in hemato-oncologic disease development.