The purpose of this study is to study normal and sarcoma cells. To study these cells we need to have human tissue. You will be having or have already had a procedure to remove tissue. We would like to use some of this tissue. We will use it for laboratory studies on the diagnosis,behavior and treatment of sarcoma. We will perform an extensive analysis of your samples. We will only use extra tissue left over after all needed testing has been done or remove an additional small amount of tissue if you are having a biopsy. We will also take blood samples before and/or after your procedure to measure biochemical factors that may help us predict the behavior of sarcoma.