sentences:  By pure chance, in May 2016, an American pathologist named Rolf F. Barth was visiting the Sun Yat-sen Memorial Hall in Guangzhou when he noticed a faded copy of the original autopsy report on display.The autopsy was performed immediately after Sun's death by James Cash, a pathologist at PUMCH.Based on a tissue sample, Cash concluded that the cause of death was an adenocarcinoma in the gallbladder that had metastasized to the liver.