Adrenal gland – C-peptide negative adrenocortical adenoma

Adrenal gland – C-peptide negative pheochromocytoma

Breast – C-peptide negative invasive breast cancer of no special type (NST)

Breast – C-peptide negative invasive lobular breast cancer

Colon – C-peptide negative colorectal adenocarcinoma

Esophagus – C-peptide negative adenocarcinoma

Esophagus – C-peptide negative squamous cell carcinoma

Kidney – C-peptide negative chromophobe renal cell carcinoma

Kidney – C-peptide negative clear cell carcinoma

Kidney – C-peptide negative papillary renal cell carcinoma

Liver – C-peptide negative cholangiocellular carcinoma

Liver – C-peptide negative hepatocellular carcinoma

Lung – C-peptide negative adenocarcinoma

Lymph node – C-peptide negative diffuse large B-cell lymphoma

Ovary – C-peptide negative serous high-grade carcinoma

Pancreas – C-peptide negative acinar cell carcinoma

Pancreas – C-peptide negative neuroendocrine tumor

Pancreas – C-peptide negative neuroendocrine tumor

Pancreas – Neuroendocrine tumor (Insulinoma) with strong C-peptide immunostaining of tumor cells

Pancreas – Neuroendocrine tumor (insulinoma) with strong C-peptide positivity of tumor cells

Pancreas – Neuroendocrine tumor (insulinoma) with strong C-peptide staining of all tumor cells

Pancreas – Neuroendocrine tumor with many intermingled C-peptide positive cells

Pancreas – Neuroendocrine tumor with numerous intermingled cells showing strong C-peptide staining

Penis – C-peptide negative squamous cell carcinoma

Prostate – C-peptide negative adenocarcinoma (Gleason 3+3=6)

Salivary gland – C-peptide negative Warthin tumor

Stomach – C-peptide negative gastric adenocarcinoma (diffuse type)

Stomach – C-peptide negative gastrointestinal stromal tumor (GIST)

Testis – C-peptide negative embryonal carcinoma

Testis – C-peptide negative seminoma

Thyroid – C-peptide negative anaplastic carcinoma

Thyroid – C-peptide negative medullary carcinoma

Thyroid – C-peptide negative papillary carcinoma

Urinary bladder – C-peptide negative muscle-invasive urothelial carcinoma