0000950123-04-005202 8-K 2 20040426 12 7 20040427 REGENERON PHARMACEUTICALS INC 0000872589 2834 133444607 NY 1231 8-K 34 000-19034 04757171 777 OLD SAW MILL RIVER RD TARRYTOWN NY 10591-6707 9143477000 8-K 1 y96701e8vk.htm FORM 8-K EX-99.A 2 y96701exv99wa.htm PRESS RELEASE