This sub-type has a worse prognosis , because the red color and warmth of the skin indicate that tumor cells have already spread into many lymphatic vessels.
In situ cancers are confined within the lining of the ducts or lobules. These are early cancers or precancerous lesions that have not developed the ability to become invasive. They are generally of two types. Ductal in situ carcinomas (also called intraductal or ductal carcinoma in situ [DCIS]) do have the ability over a long period to become invasive cancer if untreated. So these tumors have to be completely removed. In situ lobular cancers (also called lobular carcinoma in situ [LCIS]) are best understood as markers for the risk of developing cancer. It is not usually possible to remove all lobular carcinomas in situ without removing all of both breasts. This is excessive treatment in most situations, so very careful follow-up is often recommended after removal of the in situ lesion. Treatment at the time of diagnosis may also include radiotherapy (for DCIS only).
Nearly all breast cancers arise from glandular tissue (adenocarcinomas), although other types also occur, including squamous cell carcinomas, sarcomas, carcinosarcomas, cystosarcoma phylloides and sweat gland carcinomas. There are several less common types, which have a generally better prognosis than infiltrating ductal cancer such as medullary carcinoma (6 percent of cases), mucinous (2.5 percent) and tubular (1 percent). Each type has prognostic and therapeutic implications.
How It Spreads After cancer starts, it may be several years before a lump appears. There are wide differences in the way a breast cancer behaves.
