Statistical analysis of necropsy data from small groups of mice (e.g., 60 per group) is often insufficient to confidently determine if a drug alters specific cancer types or causes of death.

“if a particular kind of of cancer let's say liver cancer kills 10% of the mice you only have six cases and yeah if that goes up to nine or goes down to three that would answer your question with a yes but statistically we just don't have enough cases to be confident”