Read the full article on regenerative tissue growth from stem cell injections @ wired. Here are a couple excerpts:

Restore 1 showed that Cytori’s cells could rebuild breasts lost to cancer. The next logical step was trying it out for breast augmentation. Perhaps not surprisingly, once again this happened in Japan. The country has a strong and entrenched cultural prejudice against putting anything foreign into one’s body; organ transplants were slow to be adopted in Japan and still remain rare. But if that ick factor is the immovable object, the Western-inspired desire for bigger breasts is the irresistible force.