If my surgeon cuts into a tumor, instead of around it, will my cancer spread?

If my surgeon cuts into a tumor, instead of around it, will my cancer spread?

In general, surgeons attempt to avoid cutting through a tumour. There is a theoretical concern that if the tumour is cut through it could potentially cause seeding of the breast cancer. However, we have had many years of experience of surgeons cutting margins around a tumour that they end up cutting through and they have to go back and to take a wider margin. It does not appear to increase a woman's risk of a local relapse from a breast cancer. Having said that, surgeons do everything that they can to avoid cutting through the tumour.