Sarcoma cancer cell. Coloured scanning electron micrograph (SEM). The movement of cancer cells around the body (metastasis) is an important part of a cancer's malignancy. Sarcomas are cancers of the connective tissues, which include muscles, blood vessels, nerves and fat. Sarcomas are a rare type of cancer and are often hard to detect. The processes on the edges of the cells allow them to move to other parts of the body. Magnification: x2000 when printed 10 centimetres wide