“ However, a number of major issues with the study were identified by the Panel which made interpretation of the findings difficult. Notably, a high background incidence of chronic inflammatory disease in the lung and other organs was observed in all the animal groups including controls which did not receive aspartame, as reported by the European Ramazzini Foundation. This was considered to be a major confounding factor.”

https://www.efsa.europa.eu/en/news/efsa-assesses-new-asparta...

Not a medical professional, but inflammation is something different from cancer that they mentioned in their website. And we need to understand also the trial scenario: in the one about 5G they expose rats for more than 20 hours to a radio power more than 10 the law limits.