Note to self: schedule a follow-up chest X-Ray on that SPN.
This is not new, you can differentiate some cancer cells with many chemicals http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Search&db=pubmed&term=cancer+differentiation+agents
Realize that the NY Times's version of medical ethics is, "Judge not, lest ye be judged." If we have to clone and then dissect--mice for now, but later little human beings--to perform our experiments, who are you to object? (BTW, if they stop at mice, I don't think there'll ever be opposition...)
It's been known for quite some time that transformed cells which have lost contact with the extracellullar matrix will, when induced to reattach, will revert to their normal cell type.