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Which nonclinical studies did approved bispecifics skip?

From the FDA and EMA reviews of all 18 approved bispecifics. Each answer links to the regulator's own sentence.

Check my plan against these
Short answer
18 of 18 skipped carcinogenicity; 18 of 18 skipped genotoxicity.
No genotoxicity studies18/18
No carcinogenicity study18/18
No dedicated repro tox14/18

Precedent by precedent

18 approved bispecifics, with the reviewers' own words.

Bizengri

zenocutuzumab · HER2 x HER3
Genotoxicity
Not conducted (ICH S6(R1))
“Standard genotoxicity studies are not considered appropriate for this class of biological product, in line with the ICH S6 (R1) guideline.”
✓ VerifiedFDA multi-discipline review, p. 85Source ↗
Carcinogenicity
Not conducted (ICH S6(R1), ICH S9)
“Carcinogenicity studies have not been performed with MCLA-128 as they are not considered appropriate for this class of biological product, in line with the ICH S6 (R1) and ICH S9 guidelines.”
✓ VerifiedFDA multi-discipline review, p. 85Source ↗
Reproductive & developmental
Not conducted; literature weight-of-evidence (HER2/HER3 essential for embryo-fetal development); boxed warning
“The Applicant did not conduct reproductive or embryo-fetal developmental toxicology studies with zenocutuzumab.”
✓ VerifiedFDA multi-discipline review, p. 58Source ↗

Blincyto

blinatumomab · CD19 x CD3
Genotoxicity
Not conducted (ICH S6(R1); protein of natural amino acids)
“In vitro and in vivo genotoxicity studies were not performed in accordance with ICH S6 (R1).”
✓ VerifiedEMA assessment report, p. 31Source ↗
Carcinogenicity
Not conducted (ICH S9, advanced cancer indication)
“As it is being developed for advanced cancer indications, no carcinogenicity studies have been conducted, in accordance with ICH S9.”
✓ VerifiedEMA assessment report, p. 31Source ↗
Reproductive & developmental
Mouse EFD with surrogate: placental transfer, no embryo-fetal toxicity or teratogenicity; no fertility studies
“Studies in mice using the surrogate showed no drug-related effects in male or female reproductive organs and did not reveal any embryo-fetal toxicity or teratogenicity.”
✓ VerifiedFDA pharmacology/toxicology review, p. 5Source ↗

Columvi

glofitamab · CD20 x CD3
Genotoxicity
Not conducted (ICH S6(R1))
“genotoxicity studies have not been conducted with glofitamab. It is not expected that glofitamab would interact directly with DNA or other chromosomal material.”
✓ VerifiedFDA multi-discipline review, p. 66Source ↗
Carcinogenicity
Not conducted (ICH S9, advanced cancer)
“Carcinogenicity studies with glofitamab have not been conducted and are not planned. Glofitamab is intended for the treatment of patients with advanced cancer.”
✓ VerifiedFDA multi-discipline review, p. 66Source ↗
Reproductive & developmental
Not conducted (weight-of-evidence assessment; B-cell depletion and cytokine release risk to pregnancy)
“While no animal studies were conducted to assess the reproductive and developmental risks of glofitamab, a weight of evidence (WoE)-based risk assessment report was submitted.”
✓ VerifiedFDA multi-discipline review, p. 41Source ↗

Elrexfio

elranatamab · BCMA x CD3
Genotoxicity
Not conducted (ICH S6(R1))
“Genotoxicity studies with elranatamab have not been conducted since they are generally not required for protein-based biotherapeutics per ICH S6(R1).”
✓ VerifiedEMA assessment report, p. 43Source ↗
Carcinogenicity
Not conducted (ICH S9 / S6(R1))
“Carcinogenicity studies with elranatamab have not been conducted since they are generally not required for advanced cancer and protein-based biotherapeutics per ICH S9 and ICH S6(R1), respectively.”
✓ VerifiedEMA assessment report, p. 43Source ↗
Reproductive & developmental
Not conducted (weight-of-evidence); reproductive organs assessed in 3-month monkey study, no effects
“Embryofetal developmental toxicity was evaluated using a weight of evidence (WOE) risk assessment”
✓ VerifiedFDA multi-discipline review, p. 48Source ↗

Epkinly

epcoritamab · CD20 x CD3
Genotoxicity
Not conducted (ICH S6(R1), ICH S9)
“Genotoxicity studies were not conducted for epcoritamab per ICHS6(R1) and ICH S9 guidance.”
✓ VerifiedFDA multi-discipline review, p. 57Source ↗
Carcinogenicity
Not conducted (ICH S6(R1), S1A, S9)
“Carcinogenicity studies were not conducted for epcoritamab per ICHS6(R1), ICH S1A, and ICH S9 guidance.”
✓ VerifiedFDA multi-discipline review, p. 57Source ↗
Reproductive & developmental
Not conducted; EFD waived due to monkey immunogenicity; WOE assessment; no reproductive organ findings in 5-week study
“An EFD toxicity study of epcoritamab in cynomolgus monkeys was waived for phase 3 trials and registration of epcoritamab across ICH regions (FDA, EMEA, and PMDA) given the high potential for immunogenicity of epcoritamab in cynomolgus monkeys.”
✓ VerifiedFDA multi-discipline review, p. 57Source ↗

Hemlibra

emicizumab · FIXa x FX
Genotoxicity
Not conducted (ICH S6)
“Genotoxicity studies were not conducted as these types of studies are not applicable to biotechnology-derived pharmaceuticals (per ICH S6).”
✓ VerifiedFDA multi-discipline review, p. 41Source ↗
Carcinogenicity
Not conducted (no pharmacologically relevant rodent; waived with ECAC concurrence)
“Carcinogenicity studies were not conducted due to lack of a pharmacologically relevant rodent species.”
✓ VerifiedFDA multi-discipline review, p. 42Source ↗
Reproductive & developmental
Not conducted (99% of patients male); no reproductive organ effects in 26-week monkey study
“Animal reproductive and developmental toxicology studies were not conducted with emicizumab as hemophilia A is inherited in an X-linked recessive manner.”
✓ VerifiedFDA multi-discipline review, p. 42Source ↗

Imdelltra

tarlatamab · DLL3 x CD3
Genotoxicity
Not conducted (ICH S6(R1))
“Therefore, no genotoxicity studies have been conducted or are planned, consistent with ICH Harmonised Tripartite Guideline S6”
✓ VerifiedFDA multi-discipline review, p. 73Source ↗
Carcinogenicity
Not conducted (ICH S9)
“No carcinogenicity studies have been conducted nor are any planned in accordance with ICH S9 (ICH, 2010).”
✓ VerifiedFDA multi-discipline review, p. 73Source ↗
Reproductive & developmental
Mouse EFD study with surrogate muS757 (GD6, GD13): no maternal or EFD toxicity up to 4500 µg/kg; placental transfer; no fertility studies
“Two administrations of a tarlatamab surrogate, mus757, that binds mouse CD3 and DLL3, to pregnant mice on gestational days (GD) 6 and GD 13 did not result in maternal toxicity or embryo-fetal development toxicity at doses ≤4500 µg/kg.”
✓ VerifiedFDA multi-discipline review, p. 50Source ↗

Kimmtrak

tebentafusp · CD3 x gp100 (TCR fusion)
Genotoxicity
Not conducted (fusion protein; ICH S6/S9)
“Based on the biologic properties of tebentafusp, a fusion protein, genetic toxicology studies are not warranted.”
✓ VerifiedFDA multi-discipline review, p. 45Source ↗
Carcinogenicity
Not conducted (advanced cancer indication)
“Carcinogenicity studies were not warranted for the proposed indication.”
✓ VerifiedFDA multi-discipline review, p. 46Source ↗
Reproductive & developmental
Not conducted (no relevant species); weight-of-evidence; FDA concluded possible fetal harm to skin, inner ear, eye
“Due to the specificity for human targets, embryo-fetal development (EFD) studies cannot be conducted in nonclinical species. Therefore, a weight of evidence assessment was conducted to evaluate the risk of tebentafusp administration on pregnancy and embryo-fetal development.”
✓ VerifiedFDA multi-discipline review, p. 46Source ↗

Korjuny

catumaxomab · EpCAM x CD3
Genotoxicity
Not conducted (ICH S6(R1))
“Genotoxicity studies have not been performed according to ICH S6(R1).”
✓ VerifiedEMA assessment report, p. 38Source ↗
Carcinogenicity
Not conducted (ICH S6); no proliferation of EpCAM+ or CD3+ cells in vitro
“Standard carcinogenicity studies are generally inappropriate for biotechnology-derived pharmaceuticals according to ICH S6.”
✓ VerifiedEMA assessment report, p. 38Source ↗
Reproductive & developmental
Not conducted (no relevant species; late-stage malignancy)
“Studies to investigate reproductive and developmental toxicity have not been performed due to the lack of an appropriate animal species, the intended patient population with late-stage malignant disease.”
✓ VerifiedEMA assessment report, p. 38Source ↗

Lunsumio

mosunetuzumab · CD20 x CD3
Genotoxicity
Not conducted (ICH S6(R1))
“In accordance with the current ICH guidance (ICH S6(R1) 2011), genotoxicity studies have not been conducted with mosunetuzumab because the potential of biotechnology products, in particular high molecular weight monoclonal antibodies, to elicit DNA damage in somatic or germ cells via electrophilic reactions is unlikely.”
✓ VerifiedFDA multi-discipline review, p. 58Source ↗
Carcinogenicity
Not conducted (ICH S6R1, oncology indication)
“No carcinogenicity studies have been conducted with mosunetuzumab and are not planned for the intended oncology indication, as per Guidance for Industry S6R1.”
✓ VerifiedFDA multi-discipline review, p. 59Source ↗
Reproductive & developmental
Not conducted (dedicated DART); NHP EFD/PPND waived on weight of evidence; no reproductive organ effects in 26-week monkey study
“A briefing book, including the WOE-based risk assessment and a request to waive a non-human primate embryo-fetal and prenatal/postnatal development study, was submitted to the FDA (dated 3 April 2018; Reference ID: 4277993).”
✓ VerifiedFDA multi-discipline review, p. 59Source ↗

Lynozyfic

linvoseltamab · BCMA x CD3
Genotoxicity
Not conducted (antibody not expected to interact with DNA)
“No genotoxicity studies were conducted with linvoseltamab as antibodies are not expected to interact directly with DNA or other chromosomal material.”
✓ VerifiedEMA assessment report, p. 33Source ↗
Carcinogenicity
Not conducted (ICH S9, advanced malignancy)
“As linvoseltamab is intended for use in patients with advanced malignancies, carcinogenicity studies were not conducted with linvoseltamab, consistent with ICH S9 guideline Nonclinical Evaluation of Anticancer Pharmaceuticals.”
✓ VerifiedEMA assessment report, p. 33Source ↗
Reproductive & developmental
Not conducted; weight-of-evidence (T-cell activation, cytokine release, B-cell depletion, placental IgG transfer)
“The Applicant provided a weight of evidence (WOE)-based risk assessment to assess the potential for reproductive and developmental toxicities.”
✓ VerifiedFDA multi-discipline review, p. 73Source ↗

Ordspono

odronextamab · CD20 x CD3
Genotoxicity
Not conducted (antibody not expected to interact with DNA)
“Antibodies, such as odronextamab, are not expected to interact directly with DNA or other chromosomal material. Therefore, no genotoxicity studies were conducted with odronextamab.”
✓ VerifiedEMA assessment report, p. 35Source ↗
Carcinogenicity
Not conducted (ICH S9, advanced malignancy)
“As odronextamab is intended for use in patients with advanced malignancies, carcinogenicity studies were not conducted with odronextamab”
✓ VerifiedEMA assessment report, p. 35Source ↗
Reproductive & developmental
No EFD study; fertility endpoints in 16-week monkey study unaffected; risk assessment in lieu (fetal B-cell lymphocytopenia, CRS)
“Embryo-fetal developmental toxicology studies with odronextamab were not conducted as such studies are expected to have limited value in further understanding and communicating risks to patients with advanced cancer.”
✓ VerifiedEMA assessment report, p. 35Source ↗

Removab

catumaxomab · EpCAM x CD3
Genotoxicity
Not conducted (not submitted; biologic, no relevant model)
“Genotoxicity studies have not been submitted.”
✓ VerifiedEMA assessment report, p. 14Source ↗
Carcinogenicity
Not conducted (not submitted)
“Carcinogenicity studies have not been submitted.”
✓ VerifiedEMA assessment report, p. 14Source ↗
Reproductive & developmental
Not conducted (not submitted)
“Reproductive and developmental toxicity studies have not been submitted.”
✓ VerifiedEMA assessment report, p. 14Source ↗

Rybrevant

amivantamab · EGFR x MET
Genotoxicity
Not conducted (not appropriate for antibodies)
“Janssen did not conduct genetic toxicology studies as they are not appropriate for antibody therapies.”
✓ VerifiedFDA multi-discipline review, p. 37Source ↗
Carcinogenicity
Not conducted (advanced cancer, ICH S9)
“In addition, Janssen did not conduct dedicated studies to assess fertility or carcinogenicity as these studies are not necessary to support the development of a drug intended to treat patients with advanced cancer.”
✓ VerifiedFDA multi-discipline review, p. 37Source ↗
Reproductive & developmental
Not conducted; weight-of-evidence (EGFR/MET knockouts, lazertinib rat EFD, zalutumumab monkey EFD); embryofetal warning
“Rather than conducting a dedicated embryofetal development study, Janssen provided a weight-of-evidence-based assessment of the potential for amivantamab to cause reproductive and embryofetal toxicity.”
✓ VerifiedFDA multi-discipline review, p. 37Source ↗

Talvey

talquetamab · GPRC5D x CD3
Genotoxicity
Not conducted (ICH S6; biotechnology-derived product)
“Genotoxicity studies routinely conducted for pharmaceuticals have not been conducted and are not applicable to biotechnology-derived pharmaceuticals such as talquetamab per ICH S6.”
✓ VerifiedFDA multi-discipline review, p. 57Source ↗
Carcinogenicity
Not conducted (ICH S9; advanced cancer)
“As indicated in the ICH S9 guidance, carcinogenicity studies are not warranted to support marketing for therapeutics intended to treat patients with advanced cancer.”
✓ VerifiedFDA multi-discipline review, p. 57Source ↗
Reproductive & developmental
Not conducted (weight-of-evidence assessment; ADA limits exposure, no relevant species); reproductive organs examined in repeat-dose study
“We agree with the Applicant’s WOE-based approach for the assessment of reproductive and developmental toxicity.”
✓ VerifiedFDA multi-discipline review, p. 58Source ↗

Tecvayli

teclistamab · BCMA x CD3
Genotoxicity
Not conducted (ICH S6(R1))
“Genotoxicity studies were not conducted with teclistamab.”
✓ VerifiedFDA multi-discipline review, p. 46Source ↗
Carcinogenicity
Not conducted (ICH S9, advanced cancer)
“Carcinogenicity studies were not conducted with teclistamab.”
✓ VerifiedFDA multi-discipline review, p. 46Source ↗
Reproductive & developmental
Not conducted; weight-of-evidence assessment (BCMA biology, knockout mice); no reproductive tissue findings in 5-week study
“No reproductive and developmental toxicity studies were conducted for teclistamab.”
✓ VerifiedFDA multi-discipline review, p. 46Source ↗

Vabysmo

faricimab · VEGF-A x Ang-2
Genotoxicity
Not conducted (ICH S6(R1))
“In accordance with ICH S6(R1) guidance, standard genotoxicity studies were not conducted with faricimab.”
✓ VerifiedFDA pharmacology/toxicology review, p. 37Source ↗
Carcinogenicity
Not conducted (no rodent VEGF-A binding); weight-of-evidence carcinogenicity assessment document
“No standard rodent carcinogenicity studies have been conducted as faricimab showed no relevant binding to mouse or rat VEGF-A.”
✓ VerifiedFDA pharmacology/toxicology review, p. 37Source ↗
Reproductive & developmental
Monkey EFD (IV, GD20-48): non-dose-dependent increase in abortions, no NOAEL; fertility via 6-month study organ histology
“An embryofetal development (EFD) study in cynomolgus monkeys showed an increase incidence of abortions in faricimab treated monkeys at IV doses of 1 or 3 mg/kg administered weekly on gestation days 20 to 48.”
✓ VerifiedFDA pharmacology/toxicology review, p. 6Source ↗

Ziihera

zanidatamab · HER2 x HER2 (biparatopic)
Genotoxicity
Not conducted (ICH S6(R1), ICH S9)
“Thus, mutagenicity studies are considered inappropriate and were not conducted.”
✓ VerifiedFDA multi-discipline review, p. 45Source ↗
Carcinogenicity
Not conducted (ICH S9; advanced cancer, no mechanistic concern)
“Thus, given the intended patient population and lack of mechanistic concern, carcinogenicity studies are not planned with zanidatamab (ICH S9)”
✓ VerifiedFDA multi-discipline review, p. 46Source ↗
Reproductive & developmental
Not conducted; weight-of-evidence, HER2 antibody class embryo-fetal toxicant (oligohydramnios)
“Consequently, the conduct of de novo developmental and reproductive toxicity (DART) studies is not warranted for zanidatamab.”
✓ VerifiedFDA multi-discipline review, p. 46Source ↗