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Scientist over the years have been studying cancer. Over the years we've discovered new things. Back in 1971 President Richord Nixon signed a thing on cancer. Then we thought cancer was cells that muliplied now we know their are many diseases to it. The number of deaths have gone down a huge amount.

U.S. have dropped by 22% for men and 14% for women between 1990 and 2007. And in 1975, only 50% of people diagnosed with cancer could expect to live for another five years; now nearly 70% do. This article would fall under "significance".

 http://healthland.time.com/2011/09/21/cancer-researchs-40th-anniversary-how-far-have-we-come/#ixzz1YbtEr8pi