I asked myself that question today, and I did a google search to find the answer (please correct me if you know otherwise).
The answer is: (at least) 200 different types of cancer.
With so many types of human cancer, you can begin to understand how it affects such vast quantities of people.
If you want to learn more about different types of cancer, go to the National Cancer Institute. Not only do they have a list of common cancer types, they also have a very extensive A to Z list of cancers.
Image Credit: National Cancer Institute

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