References

Cancer information / Cancer 101 / What is cancer? / Types of tumours

Cancer Research UK. (2014, October 28). How Cancers Grow. Retrieved from: http://www.cancerresearchuk.org/about-cancer/what-is-cancer/how-cancers-grow.

Cancer Research UK. (2014, October 29). Types of Cancer. Retrieved from: http://www.cancerresearchuk.org/about-cancer/what-is-cancer/how-cancer-starts/types-of-cancer.

National Cancer Institute. (2015, February 9). What Is Cancer?. Retrieved from: https://www.cancer.gov/about-cancer/understanding/what-is-cancer.

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