我知道有一人，十几年前患肾癌，手术，痊愈；去年患肺癌，84岁，去世......

每个人体内都有癌症基因，但是基因只有被激活才能表达，为什么得癌症的人是少数呢，因为一般情况下，直到一个人去世，癌症基因也没有被激活过。你母亲以前得过癌症，说明体内癌症基因激活过，后来治好了。但是，癌症基因一但被激活一次，就说明是癌症易感人群，所以，在接下来的阶段，一些外部加内部因素还是会激活癌症基因的。

I am a licensed physician in U.S.A. Here is the right answer for your question about your mom. this is a very commen case that if one has breast cancer she has much higher risk of breast cancer occur in the other side, so this patient should be on close surveillance so that when it realy happen she still have chance of cure. I hope or if your mom did the surveillance every year after her first breast cancer, she would have much higher chance of cure for the second breast cancer
From license physician in U.S.A.

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