Treatment of Systemic Lupus Erythematosus With Human Umbilical Cord Mesenchymal Stem Cells

Inclusion criteria: 1. Fully understand the purpose, nature, methods of the trial, as well as possible adverse reactions, voluntarily participate as a subject, and sign the informed consent form. 2. Age 18-65 years old (inclusive of the boundaries, based on the date of signing the informed consent form), regardless of gender; 3. The subjects (both male and female) must agree not to have a reproductive plan during the trial period and after the injection administration for at least 12 months, and voluntarily take effective contraceptive measures with their partners (see Appendix 1), and have no plans for sperm donation or egg donation; 4. According to the diagnostic classification criteria of the European League Against Rheumatism (EULAR) and the American College of Rheumatology (ACR) in 2019, diagnosed with systemic lupus erythematosus (SLE);