How cells become cancerous is a process researchers are still trying to fully understand. Generally, normal cells grow and multiply through controlled cell division, where old and damaged cells are replaced after they die by new cells. Sometimes this process stops working, leading cells to start growing uncontrollably and develop into a tumor.
Traditionally, cancer treatments like chemotherapy, immunotherapy, radiation and surgery focus on killing cancer cells. Another type of treatment using stem cells called differentiation therapy, however, focuses on persuading cancer cells to become normal cells.
