You should not forget about oncoviruses (e.g. EBV, HPV), also many oncogenes have viral homologs (e.g. RAF genes, https://en.wikipedia.org/wiki/C-Raf https://en

You should not forget about oncoviruses (e.g. EBV, HPV), also many oncogenes have viral homologs (e.g. RAF genes, https://en.wikipedia.org/wiki/C-Raf https://en.wikipedia.org/wiki/C-Raf)