This research was a true experimental study. The sample size was calculated using the Lemeshow formula (n = 5 rats), with correction factors of 20%. The rats were randomly grouped into the following three groups: the treatment group (five experimental rats had SCI with HNSC-secretome), the control group (five experimental rats had SCI without HNSC-secretome), and the normal group (five experimental rats did not have SCI and did not get HNSC-secretome). The treatment group received a 30 µL HNSC-secretome intrathecal injection at the T10 level three days after the SCI and laminectomy [8 (link),14 (link)]. All groups were replicated five times. The authors observed the study over 28 days [15 (link)]. The independent variable of the study is HNSC-secretome, where as the dependent variables are neuropathic pain, locomotor function, TNF-α, F2-Isoprostane, MMP-9, TGF-β, and BDNF.