The super-massive class can weigh millions or billions of stellar masses and reside at the centers of galaxies.

MSN: Existence of middleweight black holes nearly ruled out

AstraZeneca's boast was based on the results of a clinical trial called STELLAR, which compared Crestor against other medicines in the class of cholesterol drugs called statins.

FORBES: FDA Warns AstraZeneca On Crestor Marketing