Environmental biologists have studied it for years – cancer biologists are just starting to think about it – and it has the potential to result in a fundamental change in our understanding of cancer. I am talking about ecosystems.
We all learned in elementary school that diversity helps an ecosystem thrive. Bees need flowers so they can make honey from the nectar. Flowers need bees for pollination. Neither would be able to exist without each other.
How does this concept apply to cancer? Our traditional view of cancer is that cancer cells within a tumor are the same. One cell starts growing out of control, pushes out the normal cells, and the result is cancer. Indeed, we talk about cancer as being “monoclonal,” i.e. all cells being the same. A major goal of cancer research over the past decade has been to understand the changes in genes that drive the monoclonal growth of cancer cells. In some cases, such as chronic myelogenous leukemia and some cases of melanoma, we have identified the gene that causes the cancer to behave badly, and have been able to treat the cancer successfully by targeting the product of the rogue gene.