Framed behind glass in the Grand Army of the Republic Civil War Museum and Library in northeast Philadelphia is a small piece of bloodstained pillowcase on which the head of the dying president rested after he was shot at Ford's Theater in Washington 144 years ago.
Sotos, a cardiologist and author, is hoping a DNA test of the strip will reveal whether Lincoln was afflicted with multiple endocrine neoplasia, type 2B. The disorder, which occurs in one in every 600,000 people, would explain Lincoln's unusual height, his relatively small and asymmetric head and bumps on his lips seen in photos, he said.
The disorder leads to thyroid or adrenal cancer, and Sotos cites Lincoln's weight loss in office and an appearance of ill health during his final months. He said a finding that Lincoln had the genetic disorder and probably cancer could shed light on his presidency.
"I'm not interested in how Lincoln might have died. I'm interested in how he might have lived," Sotos said.
Several months ago, Sotos petitioned the museum for permission to test the pillowcase. Gary Grove, a Civil War enthusiast who advised the museum's board of directors, said the issue has been contentious in several meetings.
"There are strong voices both ways," Grove said. "It has taken up a good portion of those board meetings."
Eric Schmincke, president of the museum and its board, said members may decide at a meeting May 5. They must consider not only possible damage to the artifact but also moral issues, he said.
"You have to look at it as questioning someone that more or less can't defend themselves," Schmincke said.
Sotos, while declining to discuss the proposed DNA testing, pointed out that Lincoln has no living direct descendants who would be affected. "Every letter he every wrote has been published, every letter his wife wrote that we can find has been published," he said.
Schmincke said genetic material goes far beyond writings.
"That's him - that's his blood, his brain matter that's on there," he said. Schmincke also questioned what a positive result would mean.
"If they find it's cancer ... it's 140-plus years later," he said. "Would it have been different? We can only guess or surmise."
If Lincoln was seriously ill and knew it, Sotos said, that might explain stories of his premonitions about death.
"I don't think it was mysticism, I think that was him knowing what his body was telling him," Sotos said. "Then if you're a historian, I think you have to say ... how does that affect how you run the war, your clemency toward soldiers who may have deserted their post, the way you reconcile with the South?"