Johnson & Johnson is suspending worldwide sales of surgical tools known as power morcellators, of which it is the biggest maker. The halt stems from concerns that the devices, used in a common uterine surgery to remove fibroids, could in some cases spread cancer in the body, the Wall Street Journal reports. One in 350 women having the surgery could have a cancer called uterine sarcoma, says the FDA, which warned of the issue earlier this month. Morcellators, the Journal explains, generally operate on tissue by sending long blades through small incisions. The FDA may consider new labeling rules for the devices, Tech Times reports.