In addition, 2 days after stem cell collection, the number of CD34+ cells collected in the RAD group was also significantly lower than that in the PAD group (1.26 ± 1.93 × 106/kg vs. 8.25 ± 6.91 × 106/kg, p < 0.001; Figure 1B). This evidence concerns the gene CD34 and peripheral arterial disease.