Different cells in the body have different life spans. Red blood cells live for months, white blood cells, a few weeks and the cells that form the skin die within days. Nervous and muscular cells, unless damaged by disease or injury, live the entire life span. A benign tumor grows very slowly, has a normal cell nucleus, contains chromosomes that are normal in shape and number, conforms closely in appearance to the surrounding tissue, is localized and non-metastasizing and may be encapsulated. Benign tumors may cause discomfort and disrupt body functions.
Carcinomas are the cancer of the epithelial tissue.
Sarcomas are the cancer of the connective, muscular and vascular tissue. Cancer may affect any of the structures necessary for the production and comprehension of speech. Some are ciliated. They protect body from disease, heat, etc and remove contaminants and pathogens from the body. Connectives tissues have relatively few cells that are interspersed with a large amount of nonliving substances called the matrix .