Bluebird scrambles to find out if its gene therapy caused cancer in clinical trial February 16, 2021 Auto Bot BioPharma, biopharma nl, bluebird bio, Cambridge, Cambridge Massachusetts, gene therapy, Pharma, sickle cell disease 0 Cancer is a known risk of lentiviral-based gene therapies. Though bluebird says its gene therapy is engineered to avoid that risk, the company is suspending two clinical trials pending the outcome of its inquiry.