Although cancer is a global disease, the challenges in tackling it can be very different.
People in more developed countries are more likely to die from lung, breast, colorectal or prostate cancers. Thanks to animal research there have been many new treatments for these diseases, such as tamoxifen or Avastin, which have helped to lower mortality rates over the past 20 years.
People in less developed countries are heavily affected by stomach, liver and cervical cancers. These are often caused by infections and could be prevented by vaccines or antibiotics. These treatments have been developed through animal research and as they reach the people who need them most, they will prevent millions of cancer cases.
Link to high-res: http://www.understandinganimalresearch.org.uk/resources/image-library/1632/two-worlds-of-cancer/