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Ductal carcinoma in situ (DCIS), also known as intraductal carcinoma, is a pre-cancerous or non-invasive cancerous lesion of the breast. [1] [2] DCIS is classified as Stage 0. [3] It rarely produces symptoms or a breast lump that can be felt, typically being detected through screening mammography.
Individuals diagnosed with comedo-type DCIS (comedocarcinoma) often have a higher chance of it developing into an invasive derivative—if left untreated, this chance is nearly 100%. These individuals are also at an increased risk of cancer recurrence, with this recurrence manifesting itself earlier than in other forms of DCIS.
Invasive carcinoma of no special type (invasive carcinoma NST), invasive breast carcinoma of no special type (IBC-NST), invasive ductal carcinoma (IDC), infiltrating ductal carcinoma (IDC) or invasive ductal carcinoma, not otherwise specified (NOS) is a disease.
“I was recently diagnosed with DCIS, which stands for ductal carcinoma in situ, which is a form of breast cancer,” Fishel explained. “It is very, very, very early. It’s technically stage 0.
Consequently, finding and treating many cases of DCIS represents overdiagnosis and overtreatment. Treatment is given to all women with DCIS because it is currently impossible to predict which patients with DCIS will have an indolent, non-fatal course, and which few will inevitably progress to invasive cancer and premature death if left untreated.
Carcinoma in situ (CIS) is a group of abnormal cells. [1] [2] While they are a form of neoplasm, [3] there is disagreement over whether CIS should be classified as cancer.This controversy also depends on the exact CIS in question (e.g., cervical, skin, breast).
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