There is no so-called benefit of blood type O on cancer, because there is no direct relationship between cancer and blood type, and no blood type can achieve the effect of complete cure after suffering from cancer. Cancer is a kind of malignant tumor disease, and there is no scientific research to show that O-type blood is good for cancer, which is unscientific and has no sufficient scientific theory and basis. Moreover, cancer is caused by a variety of factors, and any blood type may develop cancer lesions. Even after the development of cancer lesions in people with blood type O, if they are not treated in time, the cancer cells may spread and metastasize, which will also pose a threat to their lives. In our daily life, we need to go to the hospital for regular medical checkups, through which we can know whether there are occupying lesions as early as possible, so as to achieve early detection and early treatment.