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Caner is our own cells that proliferate rapidly and without being checked. Our immune system does not recognize our own cells as a threat. Usually our immune system attacks foreign bodies. Thats why we have to find a match when performing organ transplants. Even when it comes to cancer markers, these markers are produced all the time in our bodies but the over produce when we have cancer and thats how we diagnose if we have cancer by use these values.
Cancer has been around for many years, It's just that we are recently finding ways of diagnosing it.

I love the fact that you have commented on this post, I wish more people were like you. If we as mankind sit together and share knowledge and brain power, we could change the world for the better. Thank you for taking time to read my post.

You were right! There is immunotherapy.

Immunotherapy is treatment that uses certain parts of a person’s immune system to fight diseases such as cancer. This can be done in a couple of ways:

Stimulating your own immune system to work harder or smarter to attack cancer cells
Giving you immune system components, such as man-made immune system proteins
Some types of immunotherapy are also sometimes called biologic therapy or biotherapy.

In the last few decades immunotherapy has become an important part of treating some types of cancer. Newer types of immune treatments are now being studied, and they’ll impact how we treat cancer in the future.

Immunotherapy includes treatments that work in different ways. Some boost the body’s immune system in a very general way. Others help train the immune system to attack cancer cells specifically.

Immunotherapy works better for some types of cancer than for others. It’s used by itself for some of these cancers, but for others it seems to work better when used with other types of treatment.

this article is from
https://www.cancer.org/treatment/treatments-and-side-effects/treatment-types/immunotherapy/what-is-immunotherapy.html

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