You must have immunotherapy confused with something else. It teaches your immune system to recognize cancer and then your immune system knows how to combat cancer, which provides a durable response. With old chemo the cancer cells will evolve and become resistant to it, which is why it only helps for a year or so. Look up Yervoy, Anti PD-1, and Anti PD-L1 drugs.
And your second statement is plain wrong. http://healthhubs.net/images/cancer-survival-trends.gif Survival rates for most cancers have increased significantly. It's just that because of population growth and the baby boomers in the USA becoming older that cancer diagnosis are rising, but survival rates are also rising so that total cancer deaths are remaining fairly constant. These statistics, since they last for 5 years, are also behind the times with the recent advancements in the last 5 years.
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