Quotes About Immunosuppression

Some physiologic responses to acute pain and stress are mediated by neuroendocrine activation and increased sympathetic tone. As a consequence, patients develop tachycardia, increased myocardial oxygen consumption, immunosuppression, hypercoagulability, persistent catabolism, and numerous other metabolic alterations.5

You have little to no response to AAV the first time your body sees it. If you used the same vector twice you would want to bump up immunosuppression. I believe there will be many new ways to deliver genes in the future as well.