Are you ignoring AACR 2017 Abstract/Poster # 1651 of MSKCC/PPHM? Your statement appears far too broad, IMO. MSKCC/Ludwig did the work reflected on that poster.
KITE had 1 or 2 deaths in its trials also, did it not? Not as bad as JUNO...those cytokine storms can wreak havoc at inappropriate times.