The specific causes of<unk>  are still unknown. The risk factors for developing this condition are similar to those for invasive breast cancer. Some women are however more prone than others to developing<unk> . Women considered at higher risks are those who have a family history of breast cancer, those who have had their periods at an early age or who have had a late menopause. Also, women who have never had children or had them late in life are also more likely to get this condition. Long-term use of estrogen-progestin hormone replacement therapy (HRT) for more than five years after menopause, genetic mutations (BRCA1 or BRCA2 genes), atypical hyperplasia, as well as radiation exposure or exposure to certain chemicals may also contribute in the development of the condition. Nonetheless, the risk of developing noninvasive cancer increases with age and it is higher in women older than 45 years.
Ductal carcinoma in situ
Basal cell adenoma
Extramammary Paget's disease
Inverted papilloma
Carcinoma in situ
Lymphomatoid papulosis
Squamous cell papilloma
Lobular carcinoma in situ