Not sure about your point, but anyway it doesn't seem exceptionally rare to me: https://www.ncbi.nlm.nih.gov/pubmed/?term=cancer+vaccine+macaque https://www.nc

Not sure about your point, but anyway it doesn't seem exceptionally rare to me: https://www.ncbi.nlm.nih.gov/pubmed/?term=cancer+vaccine+macaque https://www.ncbi.nlm.nih.gov/pubmed/?term=cancer+vaccine+mac...