Killing cancer cells is easy. Killing them without killing healthy cells is the hard part, so much of modern cancer research is focused on finding reliable ways to target cancers. As reported by Medical News Today, scientists are making headway in the use of viruses to achieve this aim. Viral mechanisms can be tailored to exploit differences between cancerous and healthy cells, as demonstrated in this research work. Reliable ways to prevent, diagnose, and cure cancer are essential to healthy life extension. We will soon be using regenerative medicine to repair age-worn organs, but this alone will not protect us from increasing risk of cancer as the years pass.