BEIJING - China's top drug safety watchdog said Friday that it has not found evidence of any ruptures in 743 French-made breast implants sold in the country.

The implants, produced by Poly Implant Prothese (PIP), caused a global health scare after French authorities recently advised women in France who carry PIP implants to have them removed over potential rupture risks.

The French medical regulatory agency said on December 30 that 20 cancer cases had been found in women wearing PIP implants, but added that a link between the cancer cases and the implants had not been confirmed.

The implants were banned in March 2010 after an official inspection found that industrial-grade silicone was used in some of PIP's products without approval from health authorities.

China's State Food and Drug Administration (SFDA), in a probe of a China-based PIP implant sales agent, found that the company imported 912 such products in question after gaining import approval from the SFDA in April 2009.

As of Thursday, 743 PIP implants that were sold by the Chinese company had been traced with no reports of ruptures, according to the administration, which has urged further efforts to trace the products.

The administration warns those who have purchased PIP implants in China to be wary of potential ruptures.