Is late-stage renal cancer metastasis to the lungs contagious?

People's living standards have improved a lot now, and their daily diet is rich in nutrition. However, the incidence of kidney cancer has increased instead of decreased. We have found in clinic that the number of new cases of kidney cancer in the past five years has increased several times compared with 20 years ago. Moreover, about 70% of these patients were found during physical examinations and had no symptoms. It is collectively called "incidental kidney cancer" internationally and clinically also called "small kidney cancer" (less than 4 cm).

Can kidney cancer be transmitted to other people?
It is currently believed that kidney cancer is closely related to the patient's decreased immunity. Those who often catch colds may have decreased immunity, which must be taken seriously. In modern society, while enjoying improved living standards, people also pay a corresponding price, such as high work pressure, long-term staying up late, or lack of exercise in a relatively closed office building for a long time; and excessive entertainment, such as playing mahjong in a closed and unventilated room, and actively or passively smoking, may lead to a decrease in one's own immunity, thus the possibility of kidney cancer. In addition, long-term exposure to harmful exhaust gas (containing lead, cadmium, etc.) in places with a lot of cars may also be an important cause of decreased immunity, so the general public, especially the elderly, should try to avoid leisure and entertainment in the above-mentioned places.
An internationally authoritative urology journal recently reported the latest research results from around the world, which stated that smoking, obesity, high blood pressure, or hormone abuse and excessive drinking may all be important risk factors for kidney cancer; in addition, aromatic hydrocarbons, aromatic amines, aflatoxins and viruses, occupational environmental factors (excessive exposure to radiation), genetic and family factors (many people in the family have cancer, etc.) may all be risk factors for kidney cancer. Eating more fruits and vegetables, which contain antioxidants such as carotenoids, vitamins A, D and E, can help reduce the occurrence of kidney cancer.