Does having a breast biopsy remove the lump?

Depends: A breast biopsy is usually performed using a needle to take a sample of the mass to determine what it is (diagnosis). If the mass is small enough, it can be entirely removed using the core needle. If it is a larger mass, then a surgical removal is needed. In these cases, the core needle biopsy should still be performed first.

Not frequently: The goal of a breast core biopsy is to sample the mass, not to completely remove it. Even when there is no radiographic evidence of a mass that remains after a biopsy, it is often prudent to surgically remove the entire core biopsy bed to ensure that all the microscopic disease gets removed and the margins are negative (assuming the biopsy had atypical or malignant findings).

It depends.: A surgical excisional biopsy will remove the whole mass. An image-guided core biopsy might remove a mass if it is small enough(maybe less than 6-7mm), but the goal here is tissue diagnosis, not entire removal.