Breast Cancer Is Usually Staged to Measure the Extent of the Disease

Breast cancer is usually staged to measure the extent of the disease and to design a specific treatment plan,using the TNM (T = tumor; N = node; M = metastasis) classification system.Review the list below and select the option that most closely describes a stage 0 carcinoma in situ (CIS) .

A) Lobular carcinoma in situ (LCIS) has abnormal cells lining the lobule and often becomes invasive.
B) Ductal carcinoma in situ (DCIS) is defined as abnormal cells lining the ductal system and is not invasive.
C) LCIS has abnormal cells infiltrating the lobule and often does not become invasive.
D) DCIS has abnormal cells lining the ductal system and is often invasive.