VEGFA and intervertebral disk degenerative disorder: To evaluate the polymorphisms frequency and the vascular endothelial growth factor gene haplotype [-2578C/A (rs699947), −1154G/A (rs1570360), +405G/C (rs2010963), −460T/C (rs833061) and +936C/T (rs3025039)] in patients with disc degeneration and also in the Control Group.