How many different types of cancer are there?

Question: How many different types of cancer are there?
- Keywords:
  cancer,
  number,
  types
Asked by to Zach on 20 Mar 2014. This question was also asked by .
- Zach Dixon answered on 20 Mar 2014:
  
  There are hundreds! Almost every type of cell can become a cancer.
  
  That is why cancer is so hard to treat and there will never be one treatment that will cure them all. We need many different treatments for all different types!

Question: How many different types of cancer are there?