Metastasis and Metastatic Cancer

In simple term, spreading of cancer is known as metastasis. Before writing about metastasis, I want to write about primary cancer. When cancer begins in a part of body is known as primary cancer. At an advance stage of cancer, the cells of original tumor broke down, transport to other part of body through lymphatic vessels or by blood stream, and create tumor there. This is known as metastasis and the tumor is known as metastatic tumor. The disease is known as metastatic cancer
For an example, if lung cancer cells spread to brain and form tumor over there, then the disease is metastatic lung cancer not brain cancer. In this case the brain tumor cell resemble with lung cancer cell not with brain cell.
Since blood travels through out body, so spreading of cancer is common from one part to another part of body. Common examples are breast cancer metastasizes to lungs, liver bones and brain. Prostate cancer spread to bones.
As the cancer cells travel through blood or lymphatic fluid so, it is common to found cancer cell in blood. In that case, the phenomenon is not considered as metastasis.
Treatment of metastasis
Generally, metastatic cancer is treated with chemotherapy, surgery, radiation, cryosurgery hormone therapy etc. Sometimes it needs combination of therapy. Treatment of metastatic cancer solely depends on size, age and location of cancer. Chemotherapy kills cancerous cell. Sometimes it was give with anticancer drug.