Читать книгу The SAGE Encyclopedia of Stem Cell Research - Группа авторов - Страница 232

In situ breast cancer refers to cancer in which the cells have remained within their place of origin—they have not spread to breast tissue around the duct or lobule. One type of noninvasive cancer called ductal carcinoma in situ (DCIS) is considered a precancerous lesion. This means that if it were left in the body, DCIS could eventually develop into an invasive cancer. Another type of noninvasive cancer called lobular carcinoma in situ (LCIS) is not considered precancerous because it won’t eventually evolve into invasive cancer. LCIS does, however, increase the risk of cancer in both breasts.

Invasive (infiltrating) breast cancers spread outside the membrane that lines a duct or lobule, invading the surrounding tissues. The cancer cells can then travel to other parts of your body, such as the lymph nodes. The type of tissue where breast cancer arises determines how the cancer behaves and what treatments are most effective. Parts of the breast where cancer begins include:

Figure 1 Anatomy of the human female breast

Source: Medline Plus.