Ran into this today on Machine Design.

http://machinedesign.com/medical/mass-spectrometry-leads-quicker-safer-biopsies

I did some follow up, here.

http://www.ornl.gov/ornl/news/news-releases/2015/new-tool-on-horizon-for-surgeons-treating-cancer-patients

And here.

http://link.springer.com/article/10.1007%2Fs13361-011-0145-5#page-1

I’ve got some ideas for improving their source, but without access to a mass spec, there’s no point in following up.  I think I will sketch them up in a book.