Cutting out a tumour can be very difficult to do without damaging/destroying the rest of the organ it is in or the surrounding tissues. This can be due to access problems, how fragile the tissue is where the tumour is, or that there wouldn’t be much organ left after removing the tumour and enough healthy tissue around the tumour which you need to to do to try and make sure you got all of the tumour.
If the cancer has spread then it can be too hard to find it all and there would be too much damage removing all of it from everywhere it has spread too.
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