Benign cells have a built-in life expectancy; in growing, they differentiate, develop and finally die. What makes cancer cells so terrifying is that they do not die. They grow out of control, causing damage to the body until it dies.
因為好的細胞自然有一個生命期，可以從成長經歷分化發展，最後自然死亡；而癌細胞之所以可怕，就是因為它不會凋亡，因此日漸侵害人體至死。