Most cancer types 'just bad luck'

[GreatGazoo]

38. Um, It DIDN'T happen. Those are far from the only carcinogens in existance but

from what I read, our immune system did NOT evolve some "part" that fights cancer. In fact:

One of the confounding characteristics of cancer has long been that the body’s usually active patrol against viruses tends to leave deadly cancer cells alone to fester, mutate and spread.

The immune system has this blind spot by design – an immune system that has an ability to attack itself leads to autoimmune diseases, so as protection, it screens out its own tissue.

For decades, scientists assumed that cancer was beyond the reach of the body’s natural defenses. But after decades of skepticism that the immune system could be trained to root out and eliminate these malignant cells, a new generation of drugs is proving otherwise.

The treatment consists of infusing antibodies that enhance the immune system to recognize cancer cells and attack it. What’s more, since the immune system has a built-in memory, it continues to go after cancer cells, so the response can be longer lasting and more complete.

http://www.ucsf.edu/news/2014/01/111531/killing-cancer-through-immune-system

In other words, new drugs can trigger the immune system to fight certain cancers but the drugs are needed to do so precisely because the human body did not evolve any "Separate system" to do so.

Prove me (and UCSF) wrong.