Does CD117 stain mast cells?
Staining for CD117 occurs in a variety of tumor types, although strong staining is present mainly in mast cell disease and gastrointestinal stromal tumors, for which CD117 is the preferred marker.
What does CD117 positive mean?
Other mesenchymal tumors that were variably CD 117 positive included clear cell sarcoma (7 of 15), metastatic melanoma (9 of 25), and malignant fibrous histiocytoma (1 of 20). These results indicate that CD117 is a specific marker for GIST among tumors that occur in the GI tract and adjacent regions.
What is CD117 a marker for?
Measuring the amount of CD117 in tumor tissue may help diagnose cancer and plan treatment. CD117 is a type of receptor tyrosine kinase and a type of tumor marker. Also called c-kit and stem cell factor receptor.
Is CD117 the same as kit?
CD117 (KIT) is a type III receptor tyrosine kinase operating in cell signal transduction in several cell types. Normally KIT is activated (phosphorylated) by binding of its ligand, the stem cell factor. This leads to a phosphorylation cascade ultimately activating various transcription factors in different cell types.
What is CD117 and CD34?
Background & objective: CD117 is highly expressed in acute non-lymphoblastic leukemia (ANLL), and may be used as an immunologic marker of myeloid leukemia. However CD117 is also expressed in some acute lymphoblastic leukemia (ALL) cases. CD34 is highly expressed in both ALL and ANLL.
What stains mast cells?
toluidine blue
Mast cells stain metachromatically with toluidine blue with greater intensity in cells containing smaller granules. Most stains for mast cells rely on the cell’s content of heparin, other glycosaminoglycans, and esterase.
What is negative for CD117?
Staining for CD117 was considered negative if less than 5% of the tumor cells were weakly stained.
Is GIST cancerous?
A gastrointestinal stromal tumor (GIST) is a type of cancer that begins in the digestive system. GIST s happen most often in the stomach and small intestine. A GIST is a growth of cells that’s thought to form from a special type of nerve cells. These special nerve cells are in the walls of the digestive organs.
What does CD33 positive mean?
In normal cells, CD33 is involved in cell signaling, cell adhesion, and cell growth. Cancer cells that make too much CD33 may grow more quickly. Knowing whether a cancer is CD33 positive may help plan treatment. Cancers that may be CD33 positive include acute myeloid leukemia and some types of lymphoma.
What is the FLT3 gene?
The FLT3 gene provides instructions for making a protein called fms-like tyrosine kinase 3 (FLT3), which is part of a family of proteins called receptor tyrosine kinases (RTKs). Receptor tyrosine kinases transmit signals from the cell surface into the cell through a process called signal transduction.
What does tryptase measure?
Tryptase is an enzyme that is released, along with histamine and other chemicals, from mast cells when they are activated as part of a normal immune response as well as in allergic (hypersensitivity) responses. This test measures the amount of tryptase in the blood.
What does DOG1 positive mean?
DOG1 positivity was relatively common in esophageal squamous cell and gastric carcinomas, whereas it was rare in colorectal carcinomas. DOG1 should be added into the diagnostic panel evaluating GI and other abdominal tumors, but limitations in its sensitivity and specificity should be recognized.
What percentage of AML is CD33 positive?
About 85–90% of AML cases express the CD33 antigen. CD33 has consequently gained clinical importance as a suitable tumor-associated antigen and target for antibody-based AML therapies.
Is CD33 a dimer?
SGN-CD33A: a novel CD33-targeting antibody–drug conjugate using a pyrrolobenzodiazepine dimer is active in models of drug-resistant AML. Blood (2013) 122 (8): 1455–1463.