Researchers from Case Western Reserve University School of Medicine and the Dana-Farber Cancer Institute have made a fundamental discovery relevant to the understanding and treatment of heart failure
It does not say "prevent" heart-failure, anywhere in the article. It is implied in the article that treatment could be greatly improved by this therapy, however, I'm not sure where the line in the summary about prevention comes from.
Newly-published research using data commissioned by Congress shows big rises in patent troll activity over the last five years — from 22% to 40% of all patent suits filed, with 4 out of five litigants being patent trolls
However, the actual article states that
Not only has the number of cases increased, but so has the proportion of these non-product-related litigants, from 22 percent to 40 percent of cases filed. They found that four of the top five patent litigants in America exist solely to file lawsuits.
The missing word, in the summary, of course, is TOP, without which the summary makes very little sense, statistics and common-sense wise.