Evidence-Based Supplement & Herb Guides

Glypican-3 IHC Test: Liver Cancer Marker, Positive Staining, and HCC Meaning

Glypican-3 IHC can support hepatocellular carcinoma diagnosis. Learn what positive GPC3 staining means and how it fits with other liver tumor markers.

Glypican-3 (GPC3) immunohistochemistry is a tissue stain used mainly to support the diagnosis of hepatocellular carcinoma (HCC), particularly when a liver tumor must be...

HepPar-1 IHC Test: Hepatocellular Carcinoma Marker, Liver Tumor Origin, and Staining Meaning

HepPar-1 IHC supports hepatocellular differentiation. Learn what granular cytoplasmic staining means and how the marker helps evaluate possible HCC.

HepPar-1 immunohistochemistry is a tissue stain used to show hepatocellular differentiation and support the diagnosis of hepatocellular carcinoma (HCC). The antibody recognizes a mitochondrial...

HER2 IHC Test: Breast Cancer, Gastric Cancer, Protein Expression Score, and HER2 Status

HER2 IHC scores tumor protein expression in breast and gastric cancer. Learn what 0, 1+, 2+, and 3+ mean, when ISH is needed, how gastric scoring differs, and why HER2-low matters.

HER2 immunohistochemistry (IHC) measures HER2 protein expression on tumor-cell membranes and helps determine whether a cancer may qualify for HER2-directed therapy. It is used...

HMB-45 IHC Test: Melanoma Marker, Positive Staining, and Melanocytic Tumor Meaning

Learn what HMB-45 IHC positivity means, how the melanoma marker is interpreted with S100, SOX10, and Melan-A, and why staining alone is not diagnostic.

HMB-45 immunohistochemistry (IHC) is a tissue stain used to identify melanocytic differentiation in tumors and skin lesions. The antibody recognizes a melanosome-associated protein related...

INSM1 IHC Test: Neuroendocrine Tumor Marker, Nuclear Staining, and Diagnostic Meaning

Learn how INSM1 IHC nuclear staining identifies neuroendocrine differentiation, how it compares with synaptophysin and chromogranin, and what positive results mean.

INSM1 immunohistochemistry (IHC) is a tissue stain that helps pathologists identify neuroendocrine differentiation in tumors. INSM1 is a transcription factor involved in neuroendocrine development,...

Ki-67 IHC Test: Tumor Proliferation Index, High Score, and Prognosis Meaning

The Ki-67 IHC test measures tumor-cell proliferation. Learn what a high Ki-67 score means, how the index is counted, tumor-specific cutoffs, prognosis, and key limitations.

Ki-67 immunohistochemistry (IHC) estimates how actively tumor cells are dividing. A pathologist stains a tissue sample for Ki-67, a protein found in proliferating cells,...

Melan-A IHC Test: Melanoma Marker, Melanocytic Tumors, and Positive Staining

The Melan-A (MART-1) IHC test helps identify melanocytic differentiation. Learn what positive staining means, how it supports melanoma diagnosis, key panel markers, and major pitfalls.

Melan-A immunohistochemistry (IHC), also called MART-1 IHC, is a tissue stain that helps pathologists identify melanocytic differentiation. A positive result means the tested cells...

MITF IHC Test: Melanoma Marker, Melanocytic Tumor Diagnosis, and Positive Staining

The MITF IHC test is a nuclear melanocytic marker used in melanoma diagnosis. Learn what positive staining means, how MITF compares with SOX10 and Melan-A, and its key limitations.

MITF immunohistochemistry (IHC) is a tissue stain used to identify microphthalmia-associated transcription factor, a nuclear protein that helps control melanocyte development and pigment-related genes....

MUC1 IHC Test: Carcinoma Marker, Tumor Expression, and Staining Pattern

The MUC1 IHC test detects a widely expressed epithelial mucin. Learn what positive staining means, normal versus tumor patterns, common carcinomas that express MUC1, and major limitations.

MUC1 immunohistochemistry (IHC) detects mucin 1, a large transmembrane glycoprotein normally found on the apical surface of many glandular and ductal epithelial cells. In...

MUC2 IHC Test: GI Tumor Marker, Mucinous Cancer, and Intestinal Type

The MUC2 IHC test detects intestinal goblet-cell mucin. Learn what positive staining means in colorectal, appendiceal, pancreatic, and mucinous tumors and how MUC2 fits into IHC panels.

MUC2 immunohistochemistry (IHC) detects mucin 2, the major gel-forming mucin produced by intestinal goblet cells. In tumor pathology, MUC2 is used mainly as a...

MUC5AC IHC Test: Pancreatic, Gastric, and Mucinous Tumor Marker

The MUC5AC IHC test detects gastric-type mucin in pancreatic, gastric, and other mucinous tumors. Learn what positive staining means, common patterns, uses, and limitations.

MUC5AC immunohistochemistry (IHC) detects mucin 5AC, a secreted gel-forming mucin normally produced by gastric foveolar cells and other mucus-secreting epithelia. In pathology, MUC5AC is...

MUM1 IHC Test: Lymphoma Marker, Plasma Cell Differentiation, and Positive Staining

The MUM1/IRF4 IHC test helps identify activated B-cell and plasma-cell differentiation. Learn what positive staining means in DLBCL, myeloma, plasmablastic tumors, and other lymphomas.

MUM1 immunohistochemistry (IHC) detects the transcription factor IRF4, also called multiple myeloma oncogene 1. In normal lymphoid tissue, MUM1 is most strongly associated with...

MyoD1 IHC Test: Rhabdomyosarcoma Marker, Sarcoma Diagnosis, and Positive Staining

Understand what a positive MyoD1 IHC stain means in rhabdomyosarcoma and sarcoma diagnosis, including nuclear staining, myogenin and desmin, MYOD1 mutation testing, and key limitations.

MyoD1 immunohistochemistry (IHC) is a tissue stain used to identify skeletal-muscle differentiation in tumors. MyoD1 is a myogenic regulatory transcription factor, so the diagnostically...

Myogenin IHC Test: Rhabdomyosarcoma Marker, Skeletal Muscle Differentiation, and Positive Staining

Learn what positive myogenin IHC means in rhabdomyosarcoma, including nuclear staining, skeletal-muscle differentiation, subtype patterns, MyoD1 and desmin comparisons, and molecular testing limits.

Myogenin immunohistochemistry (IHC) is a nuclear tissue stain used to demonstrate skeletal-muscle differentiation in tumors. The myogenin protein, encoded by the MYOG gene, is...

Napsin A IHC Test: Lung Adenocarcinoma Marker, Tumor Origin, and Positive Staining

Napsin A immunohistochemistry (IHC) is a tissue stain commonly used to support a diagnosis of lung adenocarcinoma and to help evaluate the likely origin...

OCT4 IHC Test: Germ Cell Tumor Marker, Seminoma, Embryonal Carcinoma, and Positive Staining

Learn what an OCT4 IHC test means, how nuclear OCT4 staining supports seminoma or embryonal carcinoma, and why marker panels are needed for diagnosis.

The OCT4 IHC test is a tissue stain that helps pathologists identify certain germ cell tumors, especially seminoma and embryonal carcinoma. OCT4, also called...

p40 IHC Test: Squamous Cell Carcinoma Marker, Lung Tumor Typing, and Positive Staining

Learn what a p40 IHC test shows, why nuclear p40 supports squamous cell carcinoma, how it helps type lung tumors, and what positive or negative staining means.

The p40 immunohistochemistry (IHC) test is a tissue stain that helps pathologists identify squamous differentiation, especially when classifying poorly differentiated lung cancers. p40 is...

p53 IHC Test: Tumor Suppressor Marker, Abnormal Staining, and Cancer Subtype

Learn how p53 IHC is interpreted, what wild-type, overexpression, null, and cytoplasmic patterns mean, and how p53 helps classify tumors and infer TP53 status.

The p53 immunohistochemistry (IHC) test is a tissue stain that shows the pattern of p53 protein expression in tumor cells. Pathologists often use that...

p63 IHC Test: Squamous Cell Cancer, Urothelial Cancer, Tumor Origin, and Staining Meaning

Learn what p63 IHC staining means in squamous and urothelial cancer, how p63 highlights myoepithelial cells, and why p40 and other markers may be needed.

The p63 immunohistochemistry (IHC) test is a tissue stain used to identify a nuclear protein associated with basal cells, squamous differentiation, urothelial differentiation, and...

Pancytokeratin IHC Test: Epithelial Tumors, Carcinoma Marker, and Positive Staining

Learn what pancytokeratin IHC positive staining means, how broad keratin stains help identify carcinoma, and why additional markers are needed to determine tumor origin.

Pancytokeratin immunohistochemistry (IHC) is a broad tissue stain used to look for keratin proteins that are typical of epithelial cells. In a poorly differentiated...