Acinar cell carcinoma of the pancreas exhibiting a moderate focal CPA1 positivity. (CPA1 immunohistochemistry)

Acinar cell carcinoma of the pancreas showing strong CPA1 immunostaining in all tumor cells. (CPA1 immunohistochemistry)

Complete absence of CPA1 immunostaining in a ductal adenocarcinoma of the pancreas. (CPA1 immunohistochemistry)

Complete absence of CPA1 immunostaining in a neuroendocrine carcinoma of the pancreas. (CPA1 immunohistochemistry)

Ductal adenocarcinoma of the pancreas lacking CPA1 immunostaining. (CPA1 immunohistochemistry)

Moderate focal CPA1 immunostaining involving about 70% of tumor cells of a pancreatic acinar cell carcinoma. (CPA1 immunohistochemistry)

Neuroendocrine tumor of the pancreas without CPA1 immunostaining. (CPA1 immunohistochemistry)

Strong CPA1 immunostaining in a pancreatic acinar cell carcinoma. (CPA1 immunohistochemistry)