In the US, 6.9% of people develop lung cancer, 0.6% brain cancer and 0.00072% get tumours in their laryngeal (voice box) cartilage at some point in their lifetime.
在美国,患肺癌的人数占全国人口的6.9%,脑癌人数占0.6%,0.00072%的人曾患有喉软骨肿瘤。
Toxins from cigarette smoke could explain why lung cancer is more common.
香烟产生的毒素能够解释为什么肺癌相比其他癌症更为常见。
But the digestive system is exposed to more environmental toxins than the brain, yet brain tumours are three times as common as those in the small intestine.
尽管消化系统比之大脑更易受到周围毒素的影响,但患上脑瘤的风险却是患上小肠癌的三倍。
Root of cancer
癌症的根源
The team at Johns Hopkins University School of Medicine and Bloomberg School of Public Health believe the way tissues regenerate is the answer.
这个来自约翰霍普金斯大学彭博公共卫生医药学院的研究团队认为答案在于细胞组织的再生。
Old tired cells in the body are constantly being replaced with new ones made by dividing stem cells.
人体通过不断分裂干细胞替代衰老的细胞。
But with each division comes the risk of a dangerous mutation that moves the stem cell one step closer to being cancerous.
但是每一次的分裂都暗藏着突变风险,它会使干细胞更倾向于癌变。
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