Abecma
idecabtagene vicleucel · BCMA CAR-TNot explicitly stated; mouse MED 6.16x10^5 CAR+ cells corresponds to HED 2.05x10^8 CAR+ T cells (100 kg)
The public FDA and EMA reviews of Provenge don't say how the first human dose was chosen. That rationale is in the IND, which is confidential, so it is missing for most approved products.
FDA expects preclinical proof-of-concept and toxicology studies to identify active dose levels and support the choice of starting dose and escalation. The 2013 guidance gives no numeric formula or scaling rule for the starting dose.
NOAEL / key findings: No NOAEL; cell dose not limited by toxicity; highest feasible dose used in animal studies; no obvious adverse effects in mice (EMA assessment report, p. 34)