Cramer vets biotech giants Biogen, Celgene, Gilead and Regeneron for positive prospects By: CNBC.com News May 10, 2018 at 18:31 PM EDT Jim Cramer examines "the four horsemen of biotech" to see if their weakening stocks can regain momentum. Read More >> Related Stocks: Biogen Idec Celgene Corp Gilead Sciences Regeneron Pharmaceuticals