How Amgen Could Take A Hammer To Sales Of Alexion's Biggest Drug

Alexion Pharmaceuticals (ALXN) stock crashed Friday after officials agreed to review Amgen's (AMGN) challenge to the patents covering Alexion's blockbuster drug, Soliris.

https://www.investors.com/news/technology/alexion-stock-crashes-amgen-seeks-invalidate-soliris-patents/?src=A00444A&