How does cancer spread?

How does cancer spread? While studying human brain tumour cells, a team of scientists at the Research Institute of the McGill University Health Centre (RI-MUHC) found some answers to this crucial, yet so far unanswered question. They looked at a gene called EGFRvIII, which is present in patients with glioblastoma — a highly aggressive form of brain cancer that spreads quickly and that is difficult to treat.
Go to Source