Between 300,000 and 400,000 women in 65 countries from Europe to Latin America have implants made with sub-standard silicone gel by 72-year-old Jean-Claude Mas's now-bankrupt company Poly Implant Prothese (PIP).
France last week advised 30,000 women to have their PIP implants removed because of an increased risk of rupture and Venezuela's government announced Tuesday that women with the implants could have them removed for free.
Authorities in other countries have advised women to consult their doctors over the implants, while it emerged Monday that US authorities had already raised the alarm over the company in 2000.
Lawsuits filed in the US cite defective merchandise not suited for its intended purpose and violations of consumer legislation by PIP, which was once the world's third-largest producer of silicone implants.
With Mas due in a French court next year, questions are increasingly being asked over why it took until 2010 for French authorities to intervene, while Mas's lawyer has been actively defending his client in the press.
"He's at home... he's not on the run at all. Moreover he can't walk because he's just been operated on," lawyer Yves Haddad told AFP on Tuesday, saying he simply "doesn't want to talk" publicly.
Haddad said that Mas freely admits using unapproved silicone gel, but remains adamant it is safe.
"PIP knew it wasn't in compliance, but it wasn't a toxic product," the lawyer said, adding it "had not been proven" the implants were any more likely to leak.
"The fact that it's an irritant (when ruptured) is the same for all silicone gels," Haddad said, also denying that his client had ever been a sausage butcher or wine merchant, as reported by the French press.
PIP used two types of silicone in its implants, Haddad said. One of them was an approved gel made by American firm Nusil, but it also used an "identical" homemade gel that was five times cheaper.
According to PIP's 2010 bankruptcy filing, it had exported 84 percent of its annual production of 100,000 implants.
Prosecutors in Marseille, near PIP's laboratory at Seyne-sur-Mer on the Mediterranean, have received more than 2,000 complaints from Frenchwomen who received the implants, and are pursuing a criminal investigation.
On Tuesday it emerged that the US Food and Drug Administration had already in 2000 sent a letter to PIP warning of "serious" quality control violations involving its saline implants.
Although the complaint targeted saline rather than the silicone implants at the centre of the current scandal, the letter outlined a list of quality assurance problems.
The FDA warned they "may be symptomatic of serious underlying problems in your firm's manufacturing and quality assurance systems."
The FDA said it could not confirm that the results of the inspection were related to French authorities, including the AFSSAPS health agency which only warned of potential problems with PIP in 2010.
Nicknamed Professor Nimbus after a bespectacled and bearded comic book character by former colleagues, Mas worked at pharmaceutical giant Bristol-Myers (now Bristol-Myers Squibb) before meeting up with plastic surgeon Henri Arion who introduced breast implants to France in 1965, Haddad said.
Mas's trial for "aggravated fraud" is due to open late 2012, while a manslaughter inquiry has also been opened after at least one suspicious death in France.
The boss of a nearby competitor laboratory told French daily Liberation's Wednesday edition that Mas "really made a lot of big mistakes."
"Now he's going to have to make amends. You can also ask yourself why the AFSSAPS didn't do anything sooner. Why they let it reach this point?" the competitor said, pointing to Mas's likely only remaining line of defence.