What is the difference between early cancer screening products and genetic testing on the market?

Cancer genetic testing can only tell us whether a person has genes related to hereditary cancer, but this answer can't explain whether this person will definitely get cancer in his life or when he will get cancer. Early cancer screening products on the market, taking miRNA detection as an example, can more sensitively detect whether there is cancer risk in the subject by detecting a group of tumor-specific mirnas in the blood.