Cancer cells

Cancer cells accumulate to form tumors. Tumors can be benign or malignant. Benign tumors are not cancerous. They are often taken and often do not repeat. Cells in benign tumors do not spread to other parts of the body. Most importantly, benign tumors are rarely life-threatening. Malignant tumors are cancerous. Cells in malignant tumors are abnormal and divide uncontrolled and irregular. These tumors can compress, infiltrate or destroy normal tissues. If cancer cells are separated from the tumor from which they are formed, they can go to other parts of the body through blood or lymph circulation. They form tumor colonies where they go and continue to grow. The spread of cancer to ot her parts of the body in this way is called metastasis.