In vitro immunotoxicity/cytokine release assays: only neutralising ADA and possible enhanced recall response
“Beside the potential of tislelizumab to induce neutralising ADA and to possibly induce an enhanced recall response to the re-challenge antigen, no other toxicities were detected.”
ADA in most monkeys, mostly neutralising; reduced Cmax/AUC especially at low dose, but exposure maintained
“ADA were detected in most of the animals and determined to be mostly neutralising. An impact on Cmax and AUC was evident especially in the low dose group and potentially also on AUC for the mid and high-dose group, nevertheless exposure was still present.”
Monotherapy pool: treatment-emergent ADA 16.3% (232/1424); neutralizing 0.6% (11)
“Among 1424 evaluable patients treated with tislelizumab 200 mg Q3W as monotherapy, 232 (16.3%) had treatment-emergent ADA, of which 224 (15.7%) had treatment-induced ADA, and 8 (0.6%) had treatment-boosted ADA, and 11 (0.6%) had neutralizing antibodies (Table 5-3).”
In vitro whole-blood cytokine release far below alemtuzumab/TGN1412 controls; no effects on monkey TDAR, lymphocyte subsets or serum cytokines; ADA in some monkeys