But you have not actually been able to point out the basics that I am missing. You mention a specific condition which is listed as rare via a google search [0]. This condition is also caused by tumors so again perhaps a subset of these cases are completely resolved just by destroying the cells.
The fact of the matter is that I think any kind of refutation is actually pretty difficult for you (perhaps due to the medical training). It likely would have been easier had you just agreed and said "Yes if you can destroy the cancer cells you can treat >90% of all cancer."