Maybe 23andMe was (certainly they seemed to be based on the idea that all disease would be single-gene, single-mutation, mendelian inheritance). But many moder

Maybe 23andMe was (certainly they seemed to be based on the idea that all disease would be single-gene, single-mutation, mendelian inheritance). But many modern treatments for cancer use genetic tests to determine if the treatment would be effective. Because most cancer treatments are truly challenging (serious side effects), we want to know whether the patient would respond. This has already been integrated with the treatment process and from what I understand, it's not junk science, and is fairly successful.