VEGFA and hereditary spastic paraplegia: VEGFA levels were 0.1003 ± 0.003661 pg/mg protein in the control group, 0.09768 ± 0.0009 pg/mg in OLP, 0.1119 ± 0.001292 pg/mg in HSP, 0.08887 ± 0.08887 pg/mg in PIP.