Amongst the ""hallmarks of cancer" (there's a pair of papers with that title) is tissue invasion, angiogenesis and immunosuppression - and there are genes for t

Amongst the ""hallmarks of cancer" (there's a pair of papers with that title) is tissue invasion, angiogenesis and immunosuppression - and there are genes for that because the placenta needs those so the fetus can survive and reach term. What I'd really like to know is incidence of cancer in marsupials, birds and fishes, one would predict it to be markedly lower.