There is yet more evidence partial breast removal surgery to treat cancer is not likely to be a one-time operation.
The latest study in the British Medical Journal looked at data collected on more than 55,000 women. One in five had to undergo another operation to remove more breast tissue.
In the U.S., repeat surgery rates may be even higher, about one in four, according to another study earlier this year.
Breast-conserving surgery includes lumpectomies and partial mastectomies.
