No anti-pertuzumab antibodies detected in 7- and 26-week monkey studies; not immunogenic
“No antibodies to pertuzumab were detected in the 7- and 26-week toxicity studies. Despite possible interference in the ELISA assays, it appears that pertuzumab was not immunogenic in Cynomolgus monkeys.”
TCR similar in human and monkey: haired skin, mammary gland, prostate, urinary bladder, stomach, consistent with HER2 distribution
“In vitro tissue cross-reactivity studies showed similar patterns of pertuzumab binding to human and cynomolgus monkey tissues, with haired skin, mammary gland, prostate, urinary bladder and stomach identified as the major target organs, consistent with the known distribution of HER2.”
✓ VerifiedFDA pharmacology/toxicology review, p. 6Source ↗
Modality-specific risk
Embryo-fetal toxicity: fetal abnormalities secondary to oligohydramnios from HER2 blockade
“Hence, the observed external, visceral and skeletal abnormalities were considered secondary to intrauterine restriction resulting from the oligohydramnios (low amniotic fluid volume).”
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