Dr. Paul Ewald has argued, as an evolutionary biologist, that most cancers must be infectious, and may be the result of co-infections acquired within the family. He proposed in “Plague Time: The New Germ Theory”, that if cancer was a genetic disease, cancer would have disappeared from the population in a few generations. Instead, cancer is becoming more prevalent.
https://www.youtube.com/watch?v=WbG6mzYUnyU&feature=youtu.be&fbclid=IwAR07cSRiUzBpr1LyW6_XXDtifWuQI9z0N3RTdP37Hv9HXv6oyu1qvRAe1gg