Abstract
Ductal carcinoma in situ (DCIS) is thought to be a direct precursor of most cases of breast cancer and its incidence increases with age. However, the globally impressive rise of DCIS cases is probably an epidemiologic "artifact" that is mainly attributed to the establishment of screening mammography in developed countries. Furthermore, considering that usually there are no clinical findings of the disease, the initial detection of DCIS is a mammographic "event" in most cases. The risk factors for DCIS are similar to those for invasive cancer including, among others, deleterious mutations in the BRCA genes, family history of breast cancer, nulliparity, late age at first birth, increased breast density, personal history of benign breast disease, and postmenopausal obesity.
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