Thank you for asking questions, @Pradpharma. I add the excerpt from the minutes as follows;
Q1:
●Replies from 3 companies.
●In summary, evaluation methods other than the Ames test for unknown nitrosamines have not been clearly defined in the guidance now. The details will be determined in the future.
●According to the results of FDA research, the reactivity of nitrosamine Ames tests can vary greatly depending on differences in S9 between rats and hamsters, and differences in S9 amounts. Unless the method is at least optimized, the authorities can’t adopt it alone, can they?
Q2:
●Replies from 2 companies.
●If the nitrosamine sample is available, the Ames test of it may show negative. (By the way, NDPh is weakly carcinogenic due to nitroso transfer but is negative for normal Ames test)
●78,000 ng/day in Read-Across may apply to a product with two aromatic rings directly connected to nitrogen, like NDPh. There was a company that adopted the same approach as above.
Q3:
●Replies from 2 companies.
●Based on the information such as nitrogen has no basicity, there are no cases of recall for NDSRI with heterocyclic aromatic amines except for nitroso irbesartan, and metabolic activity via ring opening can not occur, it will probably be out of scope.
●A compound without basicity is not considered an amine. And it is a simple nitroso compound. However, it is suspected to be structurally mutagenic. It should be controlled under ICH M7 if the final product will be contaminated with it.
And you can find several similar topics in this community.
Just to provide information. Our USP Team in APAC is planning a Nitrosamine roadshow, and we will be organizing a workshop in Tokyo and Osaka. I am kindly hoping to count on your support for this event. I’ll share more information as soon as I receive it. Thanks
I watched the youtube video(Live streaming) of their meeting. Now it is not available. They were concerned MAH could not recall the drugs whose contaminants were beyond AI. In the case of amoxapine, the number of drugs on the market was not so much, according to them. And they were concerned about the drug shortages.
When the minutes are available, I will report them.