Registration Dossier

Administrative data

Key value for chemical safety assessment

Genetic toxicity in vitro

Description of key information

Ziprasidone was tested in the Ames bacterial mutation assay, the in vitro mammalian cell gene mutation mouse lymphoma assay, and the in vivo chromosomal aberration assay in mouse bone marrow. There was a reproducible mutagenic response in the Ames assay in one strain of S. typhimurium in the absence of metabolic activation. Positive results were obtained in the in vitro mammalian cell gene mutation assay.

Link to relevant study records

Referenceopen allclose all

Endpoint:
genetic toxicity in vitro, other
Type of information:
experimental study
Adequacy of study:
other information
Reliability:
4 (not assignable)
Rationale for reliability incl. deficiencies:
secondary literature
Reference:
Composition 0

Ziprasidone was tested in the Ames bacterial mutation assay, the in vitro mammalian cell gene mutation mouse lymphoma assay, and the in vivo chromosomal aberration assay in mouse bone marrow. There was a reproducible mutagenic response in the Ames assay in one strain of S. typhimurium in the absence of metabolic activation. Positive results were obtained in the in vitro mammalian cell gene mutation assay.

Positive results were obtained in both the in vitro mammalian cell gene mutation assay and the in vitro chromosomal aberration assay in human lymphocytes.

Conclusions:
Ziprasidone was tested in the Ames bacterial mutation assay, the in vitro mammalian cell gene mutation mouse lymphoma assay, and the in vivo chromosomal aberration assay in mouse bone marrow. There was a reproducible mutagenic response in the Ames assay in one strain of S. typhimurium in the absence of metabolic activation. Positive results were obtained in the in vitro mammalian cell gene mutation assay.
Executive summary:

Ziprasidone was tested in the Ames bacterial mutation assay, the in vitro mammalian cell gene mutation mouse lymphoma assay, and the in vivo chromosomal aberration assay in mouse bone marrow. There was a reproducible mutagenic response in the Ames assay in one strain of S. typhimurium in the absence of metabolic activation. Positive results were obtained in the in vitro mammalian cell gene mutation assay.

Endpoint:
genetic toxicity in vitro, other
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
other information
Justification for type of information:
1. HYPOTHESIS FOR THE ANALOGUE APPROACH

Ziprasidone and ziprasidone hydrochloride monohydrate have the same common functional groups, breakdown products and common mechanism of action.
The only structural difference is that the source molecule is the salified monohydrate form of ziprasidone.
In dilute aqueous conditions of defined pH a salt will behave no differently to the parent acid, at identical concentration of the particular speciated form present and will be fully dissociated.


2. SOURCE AND TARGET CHEMICAL(S) (INCLUDING INFORMATION ON PURITY AND IMPURITIES)

The purity of the chemical source substance i.e. ziprasidone hydrochloride monohydrate is not well specified in the reference document (secondary literature). However, the source of the data is the FDA Pharmacology review with application number 20-825, so, since this is a review of a substance used as an active pharmaceutical ingredient we can be assumed that impurity relevant for the hazard profile of the substance are not present in the test material.

For the chemical target, there are no relevant (for the hazard assessment of the substance) impurities, as reported by the Company.


3. ANALOGUE APPROACH JUSTIFICATION

As a results of the bibliographic search performed for ziprasidone is well clear that toxicological information on the ziprasidone hydrochloride monohydrate may be used to assess adverse health effects arising from exposure to ziprasidone - with the application of a molecular weight correction, if relevant -, if for this latter no data are available.

While the structure and the molecular weight of the two substance (i.e. source and target) are very similar, and the mechanism of action is common, the salts form i.e. the source substance is more soluble in water, so it is foreseeable that its bioavailability is greater and the read-across represents, in this case, a conservative approach to assess the heath adverse effects of ziprasidone.

Value of solubility :
Ziprasidone about 0.5 μg/mL
Ziprasidone hydrochloride about 210 μg/mL


4. DATA MATRIX

Analogue approach has been applied for the hazard assessment of the following endpoint of ziprasidone:
- Acute oral toxicity
- Acute dermal toxicity
- Skin corrosion/irritation
- Eye Irritation/corrosion
- Repeated dose toxicity
- Carcinogenicity
- Mutagenicity
- Toxicity to reproduction
Reason / purpose:
read-across source
Related information:
Composition 1
Test material information:
Composition 1

Ziprasidone was tested in the Ames bacterial mutation assay, the in vitro mammalian cell gene mutation mouse lymphoma assay, and the in vivo chromosomal aberration assay in mouse bone marrow. There was a reproducible mutagenic response in the Ames assay in one strain of S. typhimurium in the absence of metabolic activation. Positive results were obtained in the in vitro mammalian cell gene mutation assay.

Conclusions:
Ziprasidone was tested in the Ames bacterial mutation assay, the in vitro mammalian cell gene mutation mouse lymphoma assay, and the in vivo chromosomal aberration assay in mouse bone marrow. There was a reproducible mutagenic response in the Ames assay in one strain of S. typhimurium in the absence of metabolic activation. Positive results were obtained in the in vitro mammalian cell gene mutation assay.
Endpoint conclusion
Endpoint conclusion:
adverse effect observed (positive)

Additional information

Justification for classification or non-classification

There was a reproducible mutagenic response in the Ames assay in one strain of S. typhimurium in the absence of metabolic activation. Positive results were obtained in the in vitro mammalian cell gene mutation assay.