ALB and systemic lupus erythematosus: The cumulative survival rate, the cumulative incidence of proteinuria, the urinary level of albumin, and the serum levels of creatinine, albumin, blood urea nitrogen and anti-double-stranded DNA antibodies were the outcomes used by most studies selected in this systematic review to assess the potential of hMSCs administration for the treatment of systemic lupus erythematosus.