Being an MCB major, the topic of cancer and cell reproduction is of particular interest to me. Reading of this evolutionary cause to cancer was refreshing because I was only aware of the cell mechanisms that cause it. When thinking of natural selection, competition on such a microscopic level does has never crossed my mind. The fact that cancer cells can mutate so rapidly and can vary so drastically among each other within the same tumor puts natural selection in their favor. This brought me to what I would have found to be a counter intuitive way to fight off cancer before reading this article, chemotherapy. A lot of us think of chemotherapy as one of the more effective treatments for cancer, but it can actually be deadly. Chemotherapy in high doses will select for those mutated cancer cells that are resistant to this treatment, and allow them to reproduce without competition from other cancer cells. In lower doses, one can maintain the size of the tumor by balancing an amount of chemo-resistant cancer cells and regular cancer cells. I feel as though it is important not only to understand the mechanics of cancer, but also why it has evolved this way in order to find a cure for cancer. If we can combine the findings from these two fields of study, I think the future is bright in finding a cure.