Thanks for the different perspective. What did you mean by "unnecessary treatment" though? If you have cancer, doesn't it need to be treated? Doesn't cancer anywhere always cause harm to the body?
Breast cancer for example is diagnosed by increasing levels of invasiveness. First a mammogram, then possibly a 3D mammogram, then an ultrasound, then a biopsy. There are possibilities for false positives all along this path and increasing levels of possible complications when performing procedures. If a false positive gets to a biopsy and you get an infection from it, you would not have ever gotten that infection if they didn't start testing you so young. False positives are very common with breast cancer screening.
Not to mention the fact that getting a biopsy can cause the cancer to spread all over the body where it might never have grown beyond its original position had it been left untouched.
For many detectable tumors, the best answer is "wait and see", not "immediately remove". There are many reasons for this- surgery itself is risky, the tumor itself might not ever become harmful.
