Declaration of interest
F Locke is on the advisory board of Kite Pharma and is a consultant for Cellular Biomedicine Group Inc. (CBMG). M Davila is on the advisory board of Celyad, Precision Bioscience and Servier. The authors have no other relevant affiliations or financial involvement with any organization or entity with a financial interest in or financial conflict with the subject matter or materials discussed in the manuscript apart from those disclosed.