What is proliferative disease w/atypia?

➢ includes monoclonal “precancers” that are associated with a modest increase in the risk of breast cancer in both breasts; ➢ overall, 13% to 17% of women with these lesions develop breast cancer. ➢ includes atypical lobular hyperplasia (ALH) and atypical ductal hyperplasia (ADH). ➢ ALH closely resembles lobular carcinoma in situ (LCIS) and ➢ ADH closely resembles ductal carcinoma in situ (DCIS ➢ The cells in ADH are uniform in appearance and form sharply marginated spaces or rigid bridges