Adrenal gland- Adrenocortical adenoma showing weak to moderate PR immunostaining in the majority of tumor cells.
Adrenal gland- Adrenocortical carcinoma with weak PR immunostaining of a fraction of tumor cells.
Adrenal gland- PR negative pheochromocytoma.
Breast- Invasive breast cancer of no special type (NST) with strong PR immunostaining of tumor cells.
Breast- Invasive lobular breast cancer with strong PR immunostaining of tumor cells.
Colon- PR negative colorectal adenocarcinoma.
Kidney- PR negative clear cell renal cell carcinoma.
Liver- PR negative hepatocellular carcinoma.
Lung- PR negative small cell carcinoma.
Lymph node- PR negative diffuse large B-cell lymphoma.
Lymph node- PR negative Hodgkin’s lymphoma.
Ovary- Endometroid carcinoma with strong PR immunostaining of tumor cells.
Ovary- Granulosa cell tumor with weak to moderate PR immunostaining of a majoritiy of tumor cells.
Ovary- PR negative Brenner tumor.
Ovary- Serous high-grade carcinoma with strong PR immunostaining in most tumor cells.
Pancreas- Neuroendocrine tumor with strong PR immunostaining of all tumor cells.
Pancreas- PR negative ductal adenocarcinoma.
Pancreas- PR negative neuroendocrine tumor.
Penis- PR negative squamous cell carcinoma.
Pharynx- PR negative squamous cell carcinoma.
Prostate- PR negative adenocarcinoma (Gleason 3+3=6). Some stroma cells show PR positivity, however.
Prostate- Small cell carcinoma with weak to moderate PR immunostaining of few scattered tumor cells.
Salivary gland- PR negative Warthin tumor.
Skin- PR negative Merkel cell carcinoma.
Soft tissue- PR negative granular cell tumor.
Soft tissue- PR negative liposarcoma.
Stomach- PR negative gastric adenocarcinoma.
Stomach- PR negative gastrointestinal stromal tumor (GIST).
Testis- Leydig cell tumor containing scattered tumor cells showing moderate to strong PR immunostaining.
Testis- PR negative seminoma.
Thyroid- Medullary cancer with moderate PR immunostaining of all tumor cells.
Thyroid- PR negative papillary carcinoma.
Urinary bladder- PR negative muscle-invasive urothelial carcinoma.
Uterus- Endometroid endometrium carcinoma with strong PR immunostaining of tumor and stroma cells.
Uterus- Leiomyoma depicting strong PR immunostaining of all tumor cells.
Uterus, cervix- PR negative squamous cell carcinoma. Stroma cells are PR positive, however.