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Expression of LINE‐1 retrotransposons in human breast cancer

Background. Several diseases have been linked to the insertion of human LINE‐1 retrotransposons (L1Hs) into structural genes. Recently, the element has been shown to be expressed in a variety of adult and pediatric germ cell cancers, leading to speculation that L1Hs‐induced insertion mutations may play a role in the etiology of some neoplasias.