Despite a stronger market, prices of Immunex Corp. andRegeneron Pharmaceuticals Inc. common stock slid further onThursday. Immunex (NASDAQ:IMNX) closed at $47.50, down$1, as investors continued to react to the negative report onLeukine granulocyte macrophage colony stimulating factor byOppenheimer & Co. biotech analyst Jeff Casdin.

Regeneron stock (NASDAQ:REGN) closed down $1.13 at $14.75.That's 33 percent below the April 2 initial public offering priceof $22.

Centocor Inc. common stock, which lost $1.75 Wednesday afterthe company announced a 2-for-1 stock split, gained $2.88 onThursday, closing at $73.13. The Dow was up nearly 31 points.

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