I think long term CART persistence is a myth. Cancers evolve to survive from CART killing. The roles of 836 + cetuximab are: 1. 400 MG cetuximab primes TME 2. 2 doses 836 deplete terminal exhausted T cells, cancer clones with high shedding 3. cetuximab/ endogenous NK ADCC for long term OS/PFS