Fibrosis, Mastitis, or mild hyperplasia without atypia, ordinary cysts (gross or microscopic), simple apocrine metaplasia (no associated hyperplasia or adenosis), or squamous metaplasia were classified as controls.    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference

Patients with lesions such as sclerosing adenosis, fibraoadenoma with complex features, moderate or florid hyperplasia without atypia, or atypical ductal or lobular hyperplasia were excluded from being either a case or a control.    From Wordnik.com.  [PLoS ONE Alerts: New Articles] Reference