TUMOR MARKERS Flashcards
substance being produced by the cell
Tumor Markers
when an organ is undergoing cancerous growth it is a __________
Tumor Markers
uncontrolled proliferation of cells.
Tumor or Neoplasm
a tumor that is confined or encapsulated (will not proliferate)
Benign
example of Benign
adenoma (with the exception of melanoma)
a tumor that is capable of metastasis (invades other organs of the body)
Malignant
malignant tumor examples
Carcinoma and Sarcoma
a malignant tumor that is epithelial in origin or nature
Carcinoma (e.g adenocarcinoma)
a malignant tumor that is mesenchymal in origin or nature
Sarcoma (e.g Osteosarcoma)
Roles of tumor markers
- Determine risk (PSA) – elevated level of PSA is screening clue that the patient is at risk of having cancer of the prostate.
- Screen for early cancer (calcitonin, occult blood)
- Diagnose a type of cancer (hCG, catecholamines)
- Estimate prognosis (CA125)
- Predict response to therapy (CA15-3. CA125, PSA. hCG)
- Monitor for disease recurrence or progression (most widely used function)
- Therapeutic selection (her2/neu, kras)
characteristics of an ideal tumor marker
- Specificity for a single type of cancer.
- High sensitivity and specificity for cancerous growth.
- Correlation of marker level with tumor size.
- Homogenous (i.e. minimal post-translational modifications)
- Short half-life in circulation so that when production drops, the level of marker falls off rapidly, producing low or undetectable concentration.
TYPE OF TUMOR MARKER: hormones
hCG ; calcitonin ; gastrin ; prolactin
TYPE OF TUMOR MARKER: enzymes
acid phosphatase ; alkaline phosphatase ; PSA
TYPE OF TUMOR MARKER: cancer antigen proteins and glycoproteins
CA125 ; CA 15.3; CA 19.9
TYPE OF TUMOR MARKER: metabolites
Norepinephrine, Epinephrine
TYPE OF TUMOR MARKER: normal proteins
Immunoglobulin, Glycoproteins, Carcinoembryonic or Oncofetal
TYPE OF TUMOR MARKER: oncofetal antigens
CEA, AFP
TYPE OF TUMOR MARKER: receptors
Estrogen, Progesterone, Androgen and Corticosteroid
TYPE OF TUMOR MARKER: genetic changes
Mutations, Translations
WHAT CANCER..
Markers: CA15.3, BR 27.29
Breast Cancer
WHAT CANCER..
Markers: CEA, CA 19-9
Colorectal Cancer
WHAT CANCER..
Markers: CA 72.4, CA 19-9, CEA
Gastric