Safety of Cultured Allogeneic Adult Umbilical Cord Derived Mesenchymal Stem Cell Intravenous Infusion for RA

This study tests stem cells derived from umbilical cord tissue as a potential treatment for Rheumatoid Arthritis (RA), an autoimmune condition causing joint pain, swelling, and damage. These cells come from donated adult umbilical cords and are not from embryos. **You may be eligible if...** - You have a confirmed diagnosis of Rheumatoid Arthritis - You understand and are willing to sign an informed consent form **You may NOT be eligible if...** - You have an active infection - You have active cancer - You are pregnant - You have had a previous organ transplant - You have serious organ failure or major lab abnormalities - You are a pre-menopausal woman not using contraception - You have an allergy to sulfur Talk to your doctor to see if this trial is right for you.