The maker of a popular type of breast implant is asking doctors to stop using them until questions are resolved about their potential risk of cancer to women.

Bristol-Myers Squibb Co. said it was confident the implants are safe but that it could not market them in a "climate of absolute confidence" because of recent published reports raising questions about the cancer risk.The company on Wednesday voluntarily suspended shipments of silicone implants coated with polyurethane foam and marketed under the trade names Meme and Replicon.

It also asked surgeons not to implant them in patients until the Food and Drug Administration finishes analyzing the cancer risk.