Testing Lincoln's "Shroud of Turin"

The museum holding the pillowcase with Lincoln's blood and brains on it faces a request for DNA material.
Was the 16th president dying of cancer at the time of the assassination?

John Sotos, a cardiologist, an author, and a consultant for the television series House, wants to test the artifact to confirm what eyewitness accounts and 130 period images already tell him: Lincoln had a rare genetic cancer syndrome called multiple endocrine neoplasia type 2B (MEN2B).
Apparently cancer detection by photograph has not of itself progressed enough.