Dose escalation PET imaging for safety and effective therapy dose optimization of a bispecific antibody.

ABSTRACT: Selecting the dose for efficacy and first-in-human studies of bispecific antibodies (BsAbs) is a challenging process. Herein, positron emission tomography (PET) imaging with ⁸⁹Zr-labeled IBI322, an anti-CD47/PD-L1 BsAb, was used to optimize the safety and effective therapy dose. By labeling with ⁸⁹Zr, we aimed to assess the pharmacokinetics (PK), safety, and target engagement of IBI322 with dose escalation dynamic PET imaging in humanized transgenic animal models bearing MC38 tumors (knock-in of hCD47 and hPDL1). ⁸⁹Zr-labeled IBI322 specifically accumulated in tumors with a tumor-to-muscle ratio of 12.37 ± 1.42 at 168 h (0.22 mg/kg) and the biodistribution of normal tissues from PET imaging could be used for preliminary safety prediction. According to the P

SUBMITTER: Wang Y 

PROVIDER: S-EPMC7153848 | biostudies-literature | 2020 Jan-Dec

REPOSITORIES: biostudies-literature