The density of CD8-positive cells did not significantly vary between pancreatic ductal adenocarcinomas (n = 488; mean = 221, median = 122), adenocarcinomas of the ampulla of Vater (n = 54; mean = 301, median = 134), and acinar cell carcinomas (n = 7; mean = 256, median = 50; p = 0.17). This evidence concerns the gene CD8A and pancreatic ductal adenocarcinoma.