PTH and pancreatic ductal adenocarcinoma: In the chronic pancreatitis group, 3 patients had low levels of PTH, 1 (3.3%) had elevated levels of this hormone, and 26 patients had normal levels (86.7%); these figures were similar to those found in patients with pancreatic ductal adenocarcinoma (1 patient had low levels, 3.0%, 1 had high levels, 3.0%, and 31 had normal concentrations, 93.9%).