[Howlin]

And often give rise to cancer cells.

Got a link that proves that?

[cgk]

And often give rise to cancer cells.

Got a link that proves that?

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The other discussion on this same topic here on FR mentions it: Aside from the ethics, embryonic cells have displayed a tendency to produce cancerous tumors called teratomas.

When injected into SCID mice, these cells formed teratomas; tumors containing a mix of differentiated human cell types

Cancer results when cells lose their internal "brakes" and keep dividing when further proliferation is no longer desirable. Researchers must find a delicate balance between fostering the growth of new cells to replenish damaged tissues and making sure that cells don't overgrow and become cancerous.

“‘We’re not against stem-cell research of any kind,’ said [Tulane University research professor Brian] Butcher. ‘But we think there are advantages to using adult stem cells. For example, with embryonic stem cells, a significant number become cancer cells, so the cure could be worse than the disease. And they can be very difficult to grow, while adult stem cells are easy to grow.’” -Heather Heilman, “Great Transformations,” The Tulanian (Spring 2004 issue), at http://www2.tulane.edu/article_news_details.cfm?ArticleID=5155. CD30 and its ligand: possible role in regulation of teratoma stem cells.