What are the ways cancer spreads?

Cancer

is a malignant disease originating from epithelial cells, with strong invasiveness. Most cases are caused by malignant proliferation of cells due to various reasons, but it is not infectious, so simple cancer is not contagious. However, if cancer is infected with viruses, fungi and other pathogens, the pathogen will be transmitted through respiratory tract, blood and other transmission routes during contact with people. For patients with hepatitis B virus, hepatitis C virus and other viral infections, they can also be transmitted through sexual life and mother-to-child transmission.