Cancer

     Cancer starts when cells in bodies start to grow out of control.Cancer cells expand throughout the body and invades other parts or tissues of the body.Cancer cells can form tumors, but leukemia cancer rarely forms  tumors.Instead they are in blood and bone marrow.Whenever cancer cells get in your blood system they have access throughout the whole body. This process is called Metastasis. Cancer is named where it starts, so if  it starts in  your colon,it's colon cancer.Prostate cancer that runs through the bones is Metastatic prostate cancer, not bone cancer.Different kinds of  cancer behave diverse, so if  you have leukemia, and take a lung cancer treatment,there is likely a leading cause of death. Not all tumors in your body have cancer. Tumors that don't have cancer are benign.but benign tumors can be life threatning.