Table I.

Primer sequences used in reverse transcription-quantitative polymerase chain reaction analysis.

Gene	Primer sequence	Product size, bp
β-actin (13)		162
Forward	5′-GACTTAGTTGCGTTACACCCTTTCT-3′
Reverse	5′-GAACGGTGAAGGTGACAGCAGT-3′
HIF-1α (14)		150
Forward	5′-TCTGGGTTGAAACTCAAGCAACTG-3′
Reverse	5′-CAACCGGTTTAAGGACACATTCTG-3′
CXCR4 (14)		184
Forward	5′-TCTGTGACCGCTTCTACC-3′
Reverse	5′- AGGATGAGGATGACTGTGG-3′
VEGF (14)		176
Forward	5′-TGCTTCTGAGTTGCCCAGGA-3′
Reverse	5′-TGGTTTCAATGGTGTGAGGACATAG-3′

HIF-1α, hypoxia-inducible factor-1α; CXCR4, C-X-C motif chemokine receptor 4; VEGF, vascular endothelial growth factor.