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Invasive carcinoma of no special type : ウィキペディア英語版
Invasive carcinoma of no special type

Invasive carcinoma of no special type (NST) also known as invasive ductal carcinoma or ductal NOS and previously known as invasive ductal carcinoma, not otherwise specified (NOS) is a group of breast cancers that do not have the "specific differentiating features".〔 Those that have these features belong to other types.
In this group are: pleomorphic carcinoma, carcinoma with osteoclast-like stromal giant cells, carcinoma with choriocarcinomatous features, and carcinoma with melanotic features.〔 It is a diagnosis of exclusion, which means that for the diagnosis to be made all the other specific types must be ruled out.〔
==Classification==
Invasive carcinoma of no special type (NST) is the most common form of invasive breast cancer. It accounts for 55% of breast cancer incidence upon diagnosis, according to statistics from the United States in 2004.〔Percentage values are from United States statistics 2004. Subtype specific incidences are taken from (Table 6 ) (invasive) and (Table 3 ) (in situ) from . These are divided by total breast cancer incidence (211,300 invasive and 55,700 in situ cases) as reported from Breast Cancer Facts & Figures 2003-2004 ()〕 On a mammogram, it is usually visualized as a mass with fine spikes radiating from the edges. On physical examination, this lump usually feels much harder or firmer than benign breast lesions such as fibroadenoma. On microscopic examination, the cancerous cells invade and replace the surrounding normal tissues. IDC is divided in several histological subtypes.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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