Dr. David Greene R3 Stem Cell is committed to improving treatment options for COPD and other chronic illnesses through novel medicines such as R3 Stem Cell Therapy. Dr. David Greene R3 Stem Cell aims to improve patient outcomes by providing the most effective therapy for each individual's specific needs. If you or a loved one suffers from COPD, talk to Dr. Greene about whether R3 Stem Cell Therapy is the answer you've been seeking.