Indeed, that definitely helped (I didn't read TFA). https://en.wikipedia.org/wiki/Clonally_transmissible_cancer https://en.wikipedia.org/wiki/Clonally_transmis

Indeed, that definitely helped (I didn't read TFA). https://en.wikipedia.org/wiki/Clonally_transmissible_cancer https://en.wikipedia.org/wiki/Clonally_transmissible_cancer has other interesting examples, including the case of a surgeon who caught his patient's cancer after getting injured during the surgery.