[NYer]

I believe I recall reading that some country permitted embryonic cells to be implanted into the head of someone suffering from brain cancer. The cells turned into tumors, killing him

Yes ... the United States. Stem Cells Used to Fight Woman's Brain Tumor.

I don't recall the outcome; do you?

[ican'tbelieveit]

Took me a few articles: http://www.blubberblog.org/files/b2ae46460137487eb8b821a5b89004ee-217.html

She passed away shortly afterwards.