When the oxygen level of a cell drops below 40 %, an acidic environment that promotes the growth of cancer cells is created. (hope4cancer.com)
«I think that we've produced a 3 - D microenvironment which is much more like that found in vivo for growing embryoid body, which explains the higher levels of cell proliferation.» (sciencedaily.com)
(High levels of cell proliferation is a marker for breast cancer.) (johnleemd.com)