Not conducted (classical); lentiviral integration site analysis on 14 donor products
“Genotoxicity Studies: Classical genotoxicity studies were not conducted. The provided LV integration site analysis may be relevant for evaluation of potential genotoxicity.”
✓ VerifiedFDA pharmacology/toxicology review, p. 12Source ↗
Carcinogenicity
Not conducted (rodent models not appropriate for insertional mutagenesis of modified cells)
“Genotoxicity assays and carcinogenicity studies in rodents are not appropriate to assess the risk of insertional mutagenesis for genetically modified cell therapy products.”
Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Instead of genotoxicity
Lentiviral insertion site analysis on CTL019 from 14 donors (2 healthy, 12 patients)
“A genomic insertion site analysis was performed on CTL019 from 14 individual donors (2 healthy donors and 12 patients representing pediatric ALL-derived and diffuse large B-cell lymphoma (DLBCL)-derived cells).”
✓ VerifiedFDA pharmacology/toxicology review, p. 2Source ↗
DRG histopathology
Not stated in public reviews
Not reported in the public reviews. Reviewers summarise selectively, so this usually means it wasn't discussed publicly, not that it wasn't studied.
Reproductive & developmental
Not conducted
“No preclinical reproductive studies were conducted with CTL019 to assess whether it can cause fetal harm when administered to a pregnant woman.”
✓ VerifiedFDA pharmacology/toxicology review, p. 3Source ↗
Safety pharmacology
Not conducted
“No safety pharmacology studies have been conducted (see non-clinical discussion).”
“Genotoxicity Studies: Classical genotoxicity studies were not conducted. The provided LV integration site analysis may be relevant for evaluation of potential genotoxicity.”
✓ VerifiedFDA pharmacology/toxicology review, p. 12Source ↗
Genotox: in vitro mammalian
Not conducted; lentiviral integration site analysis provided instead
“Genotoxicity Studies: Classical genotoxicity studies were not conducted. The provided LV integration site analysis may be relevant for evaluation of potential genotoxicity.”
✓ VerifiedFDA pharmacology/toxicology review, p. 12Source ↗
Genotox: in vivo
Not conducted (no classical genotoxicity studies)
“Genotoxicity Studies: Classical genotoxicity studies were not conducted. The provided LV integration site analysis may be relevant for evaluation of potential genotoxicity.”
✓ VerifiedFDA pharmacology/toxicology review, p. 12Source ↗
Carcinogenicity model
Not conducted; immunocompromised mice showed no abnormal growth or clonal expansion up to 7 months; integration site analysis
“In vivo studies in immunocompromised mice did not show signs of abnormal cell growth or signs of clonal cell expansion for up to 7 months, which represents the longest meaningful observation period for immunocompromised mouse models.”
Not required: rodent carcinogenicity studies not appropriate for genetically modified cell therapy
“Genotoxicity assays and carcinogenicity studies in rodents are not appropriate to assess the risk of insertional mutagenesis for genetically modified cell therapy products.”