The onset and recurrence of cancer is one of the major biomedical quandaries of our time. Currently, surgically removed tumors often leave behind a residual cancer cell population. As not all cancer cells can be detected to ensure complete tumor removal, systemic and widespread chemotherapy is usually injected into the-bloodstream to attempt to target the remaining cancer cells. This can result in-devastating side effects because the cancer drugs flow freely throughout the bloodstream with a reduced ability to target-specific regions. This treatment kills both healthy and unhealthy cells, and thus the quality of life of cancer patients is significantly reduced.