The present invention provides an antisense nucleic acid compound inhibiting expression of vascular endothelial growth factor as well as therapeutic and diagnostic agents comprising the same as an active ingredient. A compound which nucleotide sequence is substantially complementary to a nucleotide sequence located upstream of a translation region in a gene coding for vascular endothelial growth factor and which inhibits 50% or more of the expression of vascular endothelial growth factor in cells is used as the antisense nucleic acid.
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