The correct answer is - Cancer cells can travel either through the bloodstream or the lymph system.
The site where cancer begins is called primary cancer. The cancer cells from the origin site get detached and spread to other parts of the body. Break away cancer cells primarily spread through the bloodstream or lymphatic system. At the new site they can start to grow into new tumors. The Name of the cancers are based on where they first started developing, for example breast cancer, lung cancer.
