Relebactam negative in Ames, chromosomal aberration and rat bone marrow micronucleus assays
“Relebactam was shown to be negative for mutagenicity and/or clastogeniceffects in an Ames assay, a chromosomal aberration study, and in vivo in a rat bone marrow micronucleus assay.”
✓ VerifiedFDA multi-discipline review, p. 42Source ↗
Carcinogenicity
Not conducted (non-genotoxic, short treatment duration)
“In the absence of genotoxicity, and as the proposed treatment duration is relatively short, no carcinogenicity tests have been conducted.”
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
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.
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
Mouse, rat and rabbit EFD: external/skeletal malformations (incl. cleft palate) in mice only; none in rats or rabbits
“In rats and rabbits, malformations and variations were not increased by relebactam above concurrent or historical control levels. However, in mice, increases in specificexternal and/or skeletal alterations were observed.”
✓ VerifiedFDA multi-discipline review, p. 42Source ↗
Safety pharmacology
Monkey telemetry: no effects on blood pressure, heart rate, ECG/QTc, respiration or body temperature
“No MK-7655-related changes compared to vehicle control values were observed for blood pressure measurements, heart rate, electrocardiogram parameters including QTc intervals, respiratory parameters, or body temperature.”
✓ VerifiedFDA multi-discipline review, p. 44Source ↗
Genotox: Ames
Relebactam: negative
“The genotoxic potential of relebactam was characterized by the Ames test, a chromosome aberration test in CHO-cells, and an in-vivo rat bone marrow erythrocyte micronucleus test. The outcome of the studies was negative, thus, there were no indication that relebactam is genotoxic.”
Relebactam chromosome aberration in CHO cells: negative
“The genotoxic potential of relebactam was characterized by the Ames test, a chromosome aberration test in CHO-cells, and an in-vivo rat bone marrow erythrocyte micronucleus test. The outcome of the studies was negative, thus, there were no indication that relebactam is genotoxic.”
“The genotoxic potential of relebactam was characterized by the Ames test, a chromosome aberration test in CHO-cells, and an in-vivo rat bone marrow erythrocyte micronucleus test. The outcome of the studies was negative, thus, there were no indication that relebactam is genotoxic.”
Relebactam: no significant hERG effect at 318 µM (~8-fold clinical free Cmax)
“In a whole-cell voltage-clamping of CHO cells stably expressing hERG, REL had no significant effect on hERG current relative to time-dependent changes observed in the vehicle control, at a maximal testable actual concentration of 318 μM (~8-fold clinical free fraction Cmax, 38 µM).”
Not genotoxic overall: Ames negative; in vitro chromosome aberration positive without (not with) metabolic activation; rat micronucleus and comet negative