Ask HN: Why is cancer trending?

In the last week at least, two big-name and well-regarded celebrities have died unexpectedly from cancer.

Also last week Joe Biden gave a big address at University of Pennsylvania regarding cancer and how the White House will be embarking on policies to make curing cancer a "moonshot" health project.

I can't account for the rise in interest beginning in 2015 but, at least with how it's displayed on the graph, the change from December 2014 to December 2015 was only 9 points.