Teratomas

In addition, for reasons that are still poorly understood, the amniotic cells do not seem to form the tumors known as teratomas that sometimes arise from embryonic stem cells implanted in animals. ❋ Unknown (2007)

They isolated these GFP-free clusters and found that they exhibited all of the hallmarks of induced pluripotent cells: they expressed embryonic stem cell genes, they had similar patterns of DNA methylation, they could become multiple types of cells and they could form tumors called teratomas when injected under the skin of laboratory mice. ❋ Unknown (2010)

DNA methylation, they could become multiple types of cells and they could form tumors called teratomas when injected under the skin of laboratory mice. ❋ Editors (2010)

In the tumor formation test, the team injected cells from each stage into mice with weakened immune systems to see if they formed tumors known as teratomas - containing cells that have differentiated into all three primary tissue layers. ❋ Unknown (2009)

Pluripotent cells can become any cell in the body and form tumors called teratomas when transplanted into mice. “It†™ s time to reinterpret the data, †said Renee Reijo-Pera, PhD, professor of obstetrics & gynecology at Stanford, “and to accept that we†™ re beginning to discover many different types of stem cells. ❋ Unknown (2009)

"They have been stymied by three primary problems; the potential for tissue rejection the cells 'propensity to form tumors called teratomas, and the problem of some embryonic stem cells appearing to be pre-cancerous making them very risky to inject into a living patient," ❋ Unknown (2009)

An EXIT procedure is a surgical procedure that is used to deliver babies who have airway compression due to cervical teratomas, cystic hygromas or blockage of the airway such as congenital high airway obstruction (CHAOS). ❋ Unknown (2010)