As a cancer researcher, I tried to answer why cancer is refractory from a genetic point of view. One of the big reasons why cancer is refractory is its genetic heterogeneity. In cancer, it refers to: the same cancer may be caused by different mutations. There are many literatures in this field, and I try to speak in very common language. We can think of cancer as a very large army, in which every soldier is equivalent to a cancer cell. So how big is this army? When we can see it in the hospital, it has reached the order of 10 9 (that is, 1 billion). Difficulty 1. Cancer [Base Camp] Various Arms Now the question arises, are the Read More …