NEW YORK, Jan 9 (Reuters) - The chief executive of Isis Pharmaceuticals Inc ISIS.O forecast on Wednesday that company shares would rebound after investors realize the true value of the drugmaker's recently announced cholesterol-drug deal with Genzyme Corp GENZ.O.
Isis shares jumped more than 50 percent to almost $22 in after-hours trading on Monday after Genzyme announced it would license Isis' experimental cholesterol fighter and could eventually pay Isis more than $1.5 billion in milestone payments and a 50 percent share of profits from the medicine.
But the stock had drifted down to $16.94 late on Wednesday, only 16 percent higher than before the Genzyme deal was announced.
"We are extremely disappointed, but we don't expect it to last," Stanley Crooke said in a telephone interview. "We think there will be a rational response to what we've accomplished. This is a drug that has worked stunningly well" in clinical trials. (Reporting by Ransdell Pierson; Editing by Andre Grenon)