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The efficacy of stem cell (SC) transplantation in patients with type 1 diabetes mellitus (T1DM) has remained to be fully elucidated. In the present study, a systematic review and meta-analysis was performed to determine the clinical outcomes. Electronic databases, including PubMed, MEDLINE, WanFang and the Cochrane Library were screened for relevant studies published until January 13, 2018. The references of retrieved papers, systematic reviews and trial registries were manually screened for additional papers. Two authors were involved in screening the titles in order to select eligible studies, extract data and assess the risk of bias. Studies were pooled using a random-effects model as well as the Begg's funnel plot and subgroup analysis was performed using Stata 14.0 software. A total of 47 studies were retrieved for detailed evaluation, of which 22 met the inclusion criteria. No substantial publication bias was identified. The meta-analysis revealed that SC therapy increased C-peptide levels when compared with placebo treatment in randomized-controlled trials [RCT; standardized mean difference (SMD), 0.93; 95% confidence interval (CI) 0.23-1.63] and self-controlled trials (SMD, 0.66; 95% CI, -0.22 to 1.54). An analysis demonstrated that SC therapy was more efficient at reducing the glycated hemoglobin level compared with the control group in RCTs (SMD, 0.56; 95% CI; 0.06-1.06; and SMD, 1.63; 95% CI, 0.92-2.34, respectively). The graphs demonstrated that SC transplantation resulted in a reduction of insulin requirement. Furthermore, subgroup analyses revealed that patient age, medical history and the SC injection dose may be sources of the heterogeneity observed. The greatest benefit of SC transplantation was seen in patients aged ≥18 years or a medical history of &lt;3 months. In addition, the SC injection dose of ≥10 7 IU/kg/day was more effective than &lt;10 7 IU/kg/day when the cellular composition included mesenchymal SCs and hematopoietic SCs. In conclusion, SC therapy represents an efficient option for patients with T1DM. This systematic review was registered at the International prospective register of systematic reviews (no. 42018093930).

Stem cell transplantation for the treatment of patients with type�1 diabetes mellitus: A meta‑analysis