The huge number of researchers aiming to find a treatment or cure for the many different forms of cancer could not possibly work together as effectively as a small group can. They certainly cannot all fit in one lab or even one conference venue. Its not just a matter of testing things but with coming up with things to test because if any naturally occurring substance "cured" cancer, we would have found out already. As with all types of research, they publish their results, read each other's journal articles, and use their ideas to add to that collective knowledge. Just to add to the complexity, ideas can have multiple uses - e.g. something intended to help with something else might turn out to kill cancer cells and vice versa. And, although cancer is a huge problem that affects so many people, it is not the only medical problem that the world faces. The important thing is that people are doing research and we should keep trying to direct money towards research on cancer and other important issues. There is not a cure yet but treatments are constantly being developed and made more effective so lives are being saved.