Insertional mutagenesis assessed: in vitro immortalization (IVIM) assay and integration site analyses; low risk
“Per the applicant, based on these data, the risk of insertional mutagenesis following BB305 transduction is low.”
✓ VerifiedFDA pharmacology/toxicology review, p. 24Source ↗
Carcinogenicity
Not conducted (acceptable based on product type)
“No traditional carcinogenicity studies were conducted with lovo-cel which is acceptable based on the product type.”
✓ VerifiedFDA pharmacology/toxicology review, p. 26Source ↗
Reproductive & developmental
Not conducted (no reproductive tissue findings in mouse studies; busulfan risk addressed in label)
“Per the applicant, developmental and reproductive toxicology studies were not conducted because there were no adverse findings in the male and female reproductive tissues of mice administered mBMCs transduced with BB305 LVV”
✓ VerifiedFDA pharmacology/toxicology review, p. 22Source ↗
Safety pharmacology
Not conducted
“No safety pharmacology studies with lovo-cel were conducted.”
✓ VerifiedFDA pharmacology/toxicology review, p. 15Source ↗
betibeglogene autotemcel · HBB T87Q (LVV, ex vivo HSC)
Insertional mutagenesis assessed instead of standard genotox: in vitro immortalization assay (low potential) and integration site analysis (no clonal dominance)