Commission Regulation (EU) No 544/2011 (repealed)Show full title

TIER II

5.3. Specific toxicity, pathogenicity and infectiveness studies

In certain cases, it can be necessary to carry out supplementary studies to further clarify the adverse human effects.

In particular, if results from earlier studies indicate that the micro-organism may cause long-term health effects, studies on chronic toxicity, pathogenicity and infectiveness, carcinogenicity and reproductive toxicity must be carried out. Furthermore, where a toxin is produced, kinetic studies must be performed.

Studies required must be designed on an individual basis, in the light of the particular parameters to be investigated and the objectives to be achieved. Before performing such studies, the applicant shall seek agreement of the competent authorities on the type of study to be performed.

5.4. In vivo studies in somatic cells

Circumstances in which required

If all the results of the in vitro studies are negative further testing must be done with consideration of other relevant information available. The test can be an in vivo study or an in vitro study using a different metabolising system from that/those previously used.

If the in vitro cytogenetic test is positive, an in vivo test using somatic cells (metaphase analysis in rodent bone marrow or micronucleus test in rodents) must be conducted.

If either of the in vitro gene mutation tests is positive, an in vivo test to investigate unscheduled DNA synthesis or a mouse spot test must be conducted.

5.5. Genotoxicity — In vivo studies in germ cells

Aim of the test and test conditions

See point 5.4 of Part A.

Circumstances in which required

When any result of an in vivo study in somatic cells is positive, in vivo testing for germ cell effects may be justified. The necessity for conducting these tests will have to be considered on a case-by-case basis, taking into account other relevant information available including use and expected exposure. Suitable tests would need to examine interaction with DNA (such as the dominant lethal assay), to look at the potential for inherited effects and possibly make a quantitative assessment of heritable effects. It is recognised that in view of their complexity, the use of quantitative studies would require strong justification.

(END OF TIER II)