Historical background of tumor Historical background of tumor markers markers • The first TM reported was Bence Jones The first TM reported was Bence Jones protein. Since its discovery in 1847 by protein. Since its discovery in 1847 by precipitation of a protein in acidified precipitation of a protein in acidified boiled urine , the measurement of B.J.P boiled urine , the measurement of B.J.P has been a diagnostic test for Multiple has been a diagnostic test for Multiple myloma (plasma cell tumor). myloma (plasma cell tumor). • The general application of TM for The general application of TM for monitoring cancer patient start with the monitoring cancer patient start with the discovery of AFP in 1963 and CEA in 1965. discovery of AFP in 1963 and CEA in 1965.
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Historical background of tumor markers The first TM reported was Bence Jones protein. Since its discovery in 1847 by precipitation of a protein in acidified.
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Historical background of tumor markersHistorical background of tumor markers
• The first TM reported was Bence Jones protein. Since its The first TM reported was Bence Jones protein. Since its discovery in 1847 by precipitation of a protein in acidified discovery in 1847 by precipitation of a protein in acidified boiled urine , the measurement of B.J.P has been a boiled urine , the measurement of B.J.P has been a diagnostic test for Multiple myloma (plasma cell tumor).diagnostic test for Multiple myloma (plasma cell tumor).
• The general application of TM for monitoring cancer The general application of TM for monitoring cancer patient start with the discovery of AFP in 1963 and CEA patient start with the discovery of AFP in 1963 and CEA in 1965.in 1965.
Definition of TMDefinition of TM
• A substance produced or induced by tumor cells A substance produced or induced by tumor cells and released into blood , body fluids or expressed and released into blood , body fluids or expressed on cell surface , that can be used to differentiate a on cell surface , that can be used to differentiate a tumor from normal tissue or to determine the tumor from normal tissue or to determine the presence of a tumor.presence of a tumor.
• Few markers are specific for a single individual Few markers are specific for a single individual tumortumor
) ) tumor-specific markerstumor-specific markers( ( • Most are found with different tumors of the same Most are found with different tumors of the same
• Screening in general population• Clinical staging of cancer• Prognostic indicator for disease progress• Evaluation of treatment success• Detection the recurrence of cancer• Monitoring response to therapy• Radioimmunolocalization of tumor
Recommended Cancer ScreeningRecommended Cancer ScreeningTestsTests
CancerTechnique
BreastMammography
CRCASigmoidoscopy
CervicalPAP
NeuroblastomaVMA
HCCAFP
ProstatePSA
OvarianCA 125
Predictive MarkersPredictive Markers
ER and PR: For predicting response toER and PR: For predicting response to
hormone therapy in breast cancerhormone therapy in breast cancer
HER-2: For predicting response toHER-2: For predicting response to
trastuzumab (Herceptin) in breast cancertrastuzumab (Herceptin) in breast cancer
Disease ManagementDisease Management
• Most TM are used to monitor treatment and Most TM are used to monitor treatment and progression of cancer .progression of cancer .
• Single determination does not allow definite Single determination does not allow definite conclusion.conclusion.
• Combining different markers can improve the Combining different markers can improve the diagnostic precision.diagnostic precision.
• Normal level ( negative result ) does not exclude Normal level ( negative result ) does not exclude malignancy.malignancy.
Oncofetal Ags :Oncofetal Ags :Normally produced proteins during fetal life, decrease to low levels or disappear after birth and reappear in cancer patients
CEACEAColorectal, GIT, pancreas, lung, breastColorectal, GIT, pancreas, lung, breast
Carcinofetal Carcinofetal ferritinferritin
LiverLiver
Squamous cell Squamous cell AgAg
Cervix, lung, skin, head & neckCervix, lung, skin, head & neck
Carbohydrate markers: Carbohydrate markers: Either are antigens on the tumor cell surface or are Either are antigens on the tumor cell surface or are secreted by the tumor cellssecreted by the tumor cellsThey are high molecular weight mucins or blood group They are high molecular weight mucins or blood group antigensantigens
TMTMcancercancer
CA 125CA 125Ovarian , endometrialOvarian , endometrial
Urine ( VMA , HVA )Urine ( VMA , HVA )Nuroblastoma , Nuroblastoma , phyochromocytomaphyochromocytoma
HydroxypolineHydroxypolineUrineUrineBone metastasis Bone metastasis (breast) , MM(breast) , MM
Genetic MarkersGenetic Markers
• Two classes of genes are involved in the development Two classes of genes are involved in the development of cancer :of cancer :
1.1. Oncogens : Oncogens :
cell activation genes that code for products involved in cell activation genes that code for products involved in normal cellular processes such as growth factor normal cellular processes such as growth factor signaling pathways.signaling pathways.
over expression ( activation ) of oncogens will lead to over expression ( activation ) of oncogens will lead to abnormal cell growth , resulting in malignancy (mostly abnormal cell growth , resulting in malignancy (mostly hematological malignancy ).hematological malignancy ).
Some oncogens found in human tumorsSome oncogens found in human tumors
oncogenoncogenfunctionfunctioncancercancer
N-ras mutationN-ras mutationSignal Signal transductiontransduction
AML, AML, nuroblastomanuroblastoma
K-ras mutationK-ras mutationSignal Signal transductiontransduction
Genes involved in the recognition and repair of damaged Genes involved in the recognition and repair of damaged DNADNA..
The loss of function of this genes cause inability of DNA The loss of function of this genes cause inability of DNA repair and lead to tumor formation ( mostly solid tumors )repair and lead to tumor formation ( mostly solid tumors ) ..
The oncogenicity is derived from the loss of the gene rather The oncogenicity is derived from the loss of the gene rather than activationthan activation. .
Some S. genes found in human tumorsSome S. genes found in human tumors
Genetic Testing for CancerGenetic Testing for CancerSusceptibilitySusceptibility
Genetic testing should be carried outGenetic testing should be carried out::
# # If the individual has personal or family historyIf the individual has personal or family history
suggestive of cancer susceptibilitysuggestive of cancer susceptibility
# # If the test can be adequately interpretedIf the test can be adequately interpreted
# # If the test will aid the diagnosis or influence the If the test will aid the diagnosis or influence the medical or surgical management of the patient medical or surgical management of the patient or family or family membersmembers
J Clin Oncol 2003;21:1J Clin Oncol 2003;21:1
How to identify tumor markerHow to identify tumor marker? ? On cellOn cell