Cancer is type of disease involves abnormal growth of cell. It can easily transmit & forms tumors to one organ to another organ. Metastasis is the spread of a cancer or other disease from one organ or part of the body. Metastasis is the spread of cancer cells to new areas of the body. Through metastasis the cancer cells are spreading to the different parts of the body through the blood and lymph nodes. Tumors formed from cells that have spread are called secondary tumors. The cancer may have spread to areas near the primary site is regional metastasis and to parts of the body that are farther away is distant metastasis. So it is also called as the 4th stage of the cancer.