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MULTISTEP 
CARCINOGENESIS 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
KANDAKUMAR S 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Ph.D RESEARCH SCHOLAR 
PERIYAR UNIVERSITY 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
16.09.2014
Molecular Oncology Lab (MOL) 
Hallmarks of Cancer 
Six fundamental changes 
1. Self sufficiency in growth factors 
2. Insensitivity to growth-inhibitory signals 
3. Evasion of apoptosis 
4. Limitless replicative potential 
5. Sustained angiogenesis 
6. Ability to invade and metastasize 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
16.09.2014
Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
16.09.2014
Molecular Oncology Lab (MOL) 
Molecular Basis of multistep 
carcinogenesis 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
16.09.2014
CARCINOGENESIS 
Carcinogenesis is a multistep process at both the phenotypic 
and the genetic levels. 
CARCINOGENS 
It starts with a (genetic damage): 
Environmental 
Chemical 
Radiation 
Viral 
Inhereted 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
16.09.2014
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
16.09.2014
16.09.2014
Multistep Carcinogenesis 
Colon Cancer: 
APC – RAS – P53 
Hyperplasia – Adenoma – Carcinoma 
Tumor progression and heterogeneity 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
16.09.2014
Molecular Basis of multistep 
carcinogenesis 
Neoplastic transformation is a progressive process 
involving multiple “hits” or genetic changes. 
Accumulation of multiple mutations since we need six 
fundamental changes 
Evidence is both 
Epidemiologic: cancer increase with age 
Molecular : cancers analyzed show 
multiple genetic mutations 
16.09.2014
Molecular Basis of multistep 
carcinogenesis 
Alterations in DNA cause changes in one or both of 
the following types of genes: 
Proto-oncogenes 
Tumor suppressor genes 
Best example is colonic cancer 
APCRAS18qp53 
16.09.2014
Molecular Basis of Multistep 
Carcinogenesis 
16.09.2014
Molecular Basis of multistep 
Carcinogenesis 
16.09.2014
Development of Sustained 
Angiogenesis 
Tumors cannot enlarge beyond 1-2 mm thickness unless 
they are vascularized, hypoxia will induce apoptosis by 
activation of TP53 . 
Angiogenesis is required for tumor growth & metastasis. 
Tumor-associated angiogenic factors may be produced 
by the tumor or by inflammatory cells 
TP53 inhibit angiogenesis by stimulation of 
anti-angiogenesis molecules 
VEGF is under the control of RAS oncogene . 
Proteases are involved in regulating angiogenic & 
antiangiogenic factors . 
16.09.2014
Ability to Invade & Metastasize 
1)Invasion of extracellular matrix 
2)Vascular dissemination & homing of 
tumor cells 
16.09.2014
Vascular dissemination & homing of tumor 
cells 
Tumor cells binds to leukocytes, this protect them from 
host defense mechanisms 
Tumor cells adhere to vascular endothelium & pass through 
BM 
Site of extravasations & Meyts depends on: 
-Blood & Lymphatic supply 
-Organ tropism/adhesion molecules 
16.09.2014
16.09.2014
16.09.2014
16.09.2014
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
THANK YOU 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
Molecular Oncology Lab (MOL) 
16.09.2014

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KANDAKUMAR S (KK) Molecular Oncology Lab (MOL) seminar

  • 1. MULTISTEP CARCINOGENESIS Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) KANDAKUMAR S Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Ph.D RESEARCH SCHOLAR PERIYAR UNIVERSITY Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) 16.09.2014
  • 2. Molecular Oncology Lab (MOL) Hallmarks of Cancer Six fundamental changes 1. Self sufficiency in growth factors 2. Insensitivity to growth-inhibitory signals 3. Evasion of apoptosis 4. Limitless replicative potential 5. Sustained angiogenesis 6. Ability to invade and metastasize Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) 16.09.2014
  • 3. Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) 16.09.2014
  • 4. Molecular Oncology Lab (MOL) Molecular Basis of multistep carcinogenesis Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) 16.09.2014
  • 5. CARCINOGENESIS Carcinogenesis is a multistep process at both the phenotypic and the genetic levels. CARCINOGENS It starts with a (genetic damage): Environmental Chemical Radiation Viral Inhereted Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) 16.09.2014
  • 6. Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) 16.09.2014
  • 8. Multistep Carcinogenesis Colon Cancer: APC – RAS – P53 Hyperplasia – Adenoma – Carcinoma Tumor progression and heterogeneity Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) 16.09.2014
  • 9. Molecular Basis of multistep carcinogenesis Neoplastic transformation is a progressive process involving multiple “hits” or genetic changes. Accumulation of multiple mutations since we need six fundamental changes Evidence is both Epidemiologic: cancer increase with age Molecular : cancers analyzed show multiple genetic mutations 16.09.2014
  • 10. Molecular Basis of multistep carcinogenesis Alterations in DNA cause changes in one or both of the following types of genes: Proto-oncogenes Tumor suppressor genes Best example is colonic cancer APCRAS18qp53 16.09.2014
  • 11. Molecular Basis of Multistep Carcinogenesis 16.09.2014
  • 12. Molecular Basis of multistep Carcinogenesis 16.09.2014
  • 13. Development of Sustained Angiogenesis Tumors cannot enlarge beyond 1-2 mm thickness unless they are vascularized, hypoxia will induce apoptosis by activation of TP53 . Angiogenesis is required for tumor growth & metastasis. Tumor-associated angiogenic factors may be produced by the tumor or by inflammatory cells TP53 inhibit angiogenesis by stimulation of anti-angiogenesis molecules VEGF is under the control of RAS oncogene . Proteases are involved in regulating angiogenic & antiangiogenic factors . 16.09.2014
  • 14. Ability to Invade & Metastasize 1)Invasion of extracellular matrix 2)Vascular dissemination & homing of tumor cells 16.09.2014
  • 15. Vascular dissemination & homing of tumor cells Tumor cells binds to leukocytes, this protect them from host defense mechanisms Tumor cells adhere to vascular endothelium & pass through BM Site of extravasations & Meyts depends on: -Blood & Lymphatic supply -Organ tropism/adhesion molecules 16.09.2014
  • 19. Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) THANK YOU Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) Molecular Oncology Lab (MOL) 16.09.2014

Editor's Notes

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