The document discusses epidermal growth factor (EGF) signaling and the EGF receptor. It notes that EGF is involved in normal cell processes like development, differentiation, and wound healing. The EGF receptor belongs to the ErbB family of receptor tyrosine kinases and plays a key role in signaling pathways regulating cell proliferation, survival, and apoptosis. Overexpression or abnormal activation of the EGF receptor and other ErbB family members is implicated in many epithelial cancers.
Lung cancer is a major cause of cancer deaths with approximately 80% of cases accounting to nonsmall cell lung cancer (NSCLC) . In NSCLC target therapy, epidermal growth factor receptor (EGFR) is a promising candidate.
This presentation consists of topics related to oncogene, proto oncogene, Tumor suppresor gene, Ras gene family and structure and functions of tumor suppressor gene.
Powerpoint presentation of CDK inhibitors as cancer treatment. Cell proliferation is a hallmark of cancer and cell cycle plays vital role in cell proliferation. Therefore by controlling the activity of cell cycle we can bring cancer in control.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
Lung cancer is a major cause of cancer deaths with approximately 80% of cases accounting to nonsmall cell lung cancer (NSCLC) . In NSCLC target therapy, epidermal growth factor receptor (EGFR) is a promising candidate.
This presentation consists of topics related to oncogene, proto oncogene, Tumor suppresor gene, Ras gene family and structure and functions of tumor suppressor gene.
Powerpoint presentation of CDK inhibitors as cancer treatment. Cell proliferation is a hallmark of cancer and cell cycle plays vital role in cell proliferation. Therefore by controlling the activity of cell cycle we can bring cancer in control.
The Indian Dental Academy is the Leader in continuing dental education , training dentists in all aspects of dentistry and offering a wide range of dental certified courses in different formats.
Indian dental academy provides dental crown & Bridge,rotary endodontics,fixed orthodontics,
Dental implants courses.for details pls visit www.indiandentalacademy.com ,or call
0091-9248678078
Cellular Signaling Pathways have direct implications on our understanding of tumor cell behavior. A general overview is presented here followed by a brief discussion of some of the major pathways currently implicated in cancer progression : Ras/RAF/MAP kinase pathway and PI3K/AKT/mTOR pathway s
Epidermal Growth Factor use in Diabetic Foot UlcersG H PRABHU
EGF is used by many diabetologists to treat Diabetic Foot Ulcers. If used early EGF can prevent progression of DFU resulting in amputations and related morbidity and mortality.
Basic Mutagenic signal Transduction or the cancer signal transduction that control cell cycle are important pathways to understand cancer in molecular level and to invent targeted treatment.
1.Receptors Link to other Enzymatic Activity.
2.Pathway of Intracellular Signal Transduction.
3.The Cyclic AMP pathway4.Cyclic GMP pathway
5.Phospholipids and Ca2+
6.The PI3-Kinase /Akt and mTOR pathways.
7.MAP Kinase Pathway.
Signal transducing machinery as targets for potential drugs.
Drugs:-
a). Diclofenac- for treating cholera toxin
b). Fasentin- for treating insulin signalling
These simplified slides by Dr. Sidra Arshad present an overview of the non-respiratory functions of the respiratory tract.
Learning objectives:
1. Enlist the non-respiratory functions of the respiratory tract
2. Briefly explain how these functions are carried out
3. Discuss the significance of dead space
4. Differentiate between minute ventilation and alveolar ventilation
5. Describe the cough and sneeze reflexes
Study Resources:
1. Chapter 39, Guyton and Hall Textbook of Medical Physiology, 14th edition
2. Chapter 34, Ganong’s Review of Medical Physiology, 26th edition
3. Chapter 17, Human Physiology by Lauralee Sherwood, 9th edition
4. Non-respiratory functions of the lungs https://academic.oup.com/bjaed/article/13/3/98/278874
Title: Sense of Taste
Presenter: Dr. Faiza, Assistant Professor of Physiology
Qualifications:
MBBS (Best Graduate, AIMC Lahore)
FCPS Physiology
ICMT, CHPE, DHPE (STMU)
MPH (GC University, Faisalabad)
MBA (Virtual University of Pakistan)
Learning Objectives:
Describe the structure and function of taste buds.
Describe the relationship between the taste threshold and taste index of common substances.
Explain the chemical basis and signal transduction of taste perception for each type of primary taste sensation.
Recognize different abnormalities of taste perception and their causes.
Key Topics:
Significance of Taste Sensation:
Differentiation between pleasant and harmful food
Influence on behavior
Selection of food based on metabolic needs
Receptors of Taste:
Taste buds on the tongue
Influence of sense of smell, texture of food, and pain stimulation (e.g., by pepper)
Primary and Secondary Taste Sensations:
Primary taste sensations: Sweet, Sour, Salty, Bitter, Umami
Chemical basis and signal transduction mechanisms for each taste
Taste Threshold and Index:
Taste threshold values for Sweet (sucrose), Salty (NaCl), Sour (HCl), and Bitter (Quinine)
Taste index relationship: Inversely proportional to taste threshold
Taste Blindness:
Inability to taste certain substances, particularly thiourea compounds
Example: Phenylthiocarbamide
Structure and Function of Taste Buds:
Composition: Epithelial cells, Sustentacular/Supporting cells, Taste cells, Basal cells
Features: Taste pores, Taste hairs/microvilli, and Taste nerve fibers
Location of Taste Buds:
Found in papillae of the tongue (Fungiform, Circumvallate, Foliate)
Also present on the palate, tonsillar pillars, epiglottis, and proximal esophagus
Mechanism of Taste Stimulation:
Interaction of taste substances with receptors on microvilli
Signal transduction pathways for Umami, Sweet, Bitter, Sour, and Salty tastes
Taste Sensitivity and Adaptation:
Decrease in sensitivity with age
Rapid adaptation of taste sensation
Role of Saliva in Taste:
Dissolution of tastants to reach receptors
Washing away the stimulus
Taste Preferences and Aversions:
Mechanisms behind taste preference and aversion
Influence of receptors and neural pathways
Impact of Sensory Nerve Damage:
Degeneration of taste buds if the sensory nerve fiber is cut
Abnormalities of Taste Detection:
Conditions: Ageusia, Hypogeusia, Dysgeusia (parageusia)
Causes: Nerve damage, neurological disorders, infections, poor oral hygiene, adverse drug effects, deficiencies, aging, tobacco use, altered neurotransmitter levels
Neurotransmitters and Taste Threshold:
Effects of serotonin (5-HT) and norepinephrine (NE) on taste sensitivity
Supertasters:
25% of the population with heightened sensitivity to taste, especially bitterness
Increased number of fungiform papillae
Prix Galien International 2024 Forum ProgramLevi Shapiro
June 20, 2024, Prix Galien International and Jerusalem Ethics Forum in ROME. Detailed agenda including panels:
- ADVANCES IN CARDIOLOGY: A NEW PARADIGM IS COMING
- WOMEN’S HEALTH: FERTILITY PRESERVATION
- WHAT’S NEW IN THE TREATMENT OF INFECTIOUS,
ONCOLOGICAL AND INFLAMMATORY SKIN DISEASES?
- ARTIFICIAL INTELLIGENCE AND ETHICS
- GENE THERAPY
- BEYOND BORDERS: GLOBAL INITIATIVES FOR DEMOCRATIZING LIFE SCIENCE TECHNOLOGIES AND PROMOTING ACCESS TO HEALTHCARE
- ETHICAL CHALLENGES IN LIFE SCIENCES
- Prix Galien International Awards Ceremony
New Directions in Targeted Therapeutic Approaches for Older Adults With Mantl...i3 Health
i3 Health is pleased to make the speaker slides from this activity available for use as a non-accredited self-study or teaching resource.
This slide deck presented by Dr. Kami Maddocks, Professor-Clinical in the Division of Hematology and
Associate Division Director for Ambulatory Operations
The Ohio State University Comprehensive Cancer Center, will provide insight into new directions in targeted therapeutic approaches for older adults with mantle cell lymphoma.
STATEMENT OF NEED
Mantle cell lymphoma (MCL) is a rare, aggressive B-cell non-Hodgkin lymphoma (NHL) accounting for 5% to 7% of all lymphomas. Its prognosis ranges from indolent disease that does not require treatment for years to very aggressive disease, which is associated with poor survival (Silkenstedt et al, 2021). Typically, MCL is diagnosed at advanced stage and in older patients who cannot tolerate intensive therapy (NCCN, 2022). Although recent advances have slightly increased remission rates, recurrence and relapse remain very common, leading to a median overall survival between 3 and 6 years (LLS, 2021). Though there are several effective options, progress is still needed towards establishing an accepted frontline approach for MCL (Castellino et al, 2022). Treatment selection and management of MCL are complicated by the heterogeneity of prognosis, advanced age and comorbidities of patients, and lack of an established standard approach for treatment, making it vital that clinicians be familiar with the latest research and advances in this area. In this activity chaired by Michael Wang, MD, Professor in the Department of Lymphoma & Myeloma at MD Anderson Cancer Center, expert faculty will discuss prognostic factors informing treatment, the promising results of recent trials in new therapeutic approaches, and the implications of treatment resistance in therapeutic selection for MCL.
Target Audience
Hematology/oncology fellows, attending faculty, and other health care professionals involved in the treatment of patients with mantle cell lymphoma (MCL).
Learning Objectives
1.) Identify clinical and biological prognostic factors that can guide treatment decision making for older adults with MCL
2.) Evaluate emerging data on targeted therapeutic approaches for treatment-naive and relapsed/refractory MCL and their applicability to older adults
3.) Assess mechanisms of resistance to targeted therapies for MCL and their implications for treatment selection
micro teaching on communication m.sc nursing.pdfAnurag Sharma
Microteaching is a unique model of practice teaching. It is a viable instrument for the. desired change in the teaching behavior or the behavior potential which, in specified types of real. classroom situations, tends to facilitate the achievement of specified types of objectives.
Anti ulcer drugs and their Advance pharmacology ||
Anti-ulcer drugs are medications used to prevent and treat ulcers in the stomach and upper part of the small intestine (duodenal ulcers). These ulcers are often caused by an imbalance between stomach acid and the mucosal lining, which protects the stomach lining.
||Scope: Overview of various classes of anti-ulcer drugs, their mechanisms of action, indications, side effects, and clinical considerations.
- Video recording of this lecture in English language: https://youtu.be/lK81BzxMqdo
- Video recording of this lecture in Arabic language: https://youtu.be/Ve4P0COk9OI
- Link to download the book free: https://nephrotube.blogspot.com/p/nephrotube-nephrology-books.html
- Link to NephroTube website: www.NephroTube.com
- Link to NephroTube social media accounts: https://nephrotube.blogspot.com/p/join-nephrotube-on-social-media.html
Flu Vaccine Alert in Bangalore Karnatakaaddon Scans
As flu season approaches, health officials in Bangalore, Karnataka, are urging residents to get their flu vaccinations. The seasonal flu, while common, can lead to severe health complications, particularly for vulnerable populations such as young children, the elderly, and those with underlying health conditions.
Dr. Vidisha Kumari, a leading epidemiologist in Bangalore, emphasizes the importance of getting vaccinated. "The flu vaccine is our best defense against the influenza virus. It not only protects individuals but also helps prevent the spread of the virus in our communities," he says.
This year, the flu season is expected to coincide with a potential increase in other respiratory illnesses. The Karnataka Health Department has launched an awareness campaign highlighting the significance of flu vaccinations. They have set up multiple vaccination centers across Bangalore, making it convenient for residents to receive their shots.
To encourage widespread vaccination, the government is also collaborating with local schools, workplaces, and community centers to facilitate vaccination drives. Special attention is being given to ensuring that the vaccine is accessible to all, including marginalized communities who may have limited access to healthcare.
Residents are reminded that the flu vaccine is safe and effective. Common side effects are mild and may include soreness at the injection site, mild fever, or muscle aches. These side effects are generally short-lived and far less severe than the flu itself.
Healthcare providers are also stressing the importance of continuing COVID-19 precautions. Wearing masks, practicing good hand hygiene, and maintaining social distancing are still crucial, especially in crowded places.
Protect yourself and your loved ones by getting vaccinated. Together, we can help keep Bangalore healthy and safe this flu season. For more information on vaccination centers and schedules, residents can visit the Karnataka Health Department’s official website or follow their social media pages.
Stay informed, stay safe, and get your flu shot today!
ARTIFICIAL INTELLIGENCE IN HEALTHCARE.pdfAnujkumaranit
Artificial intelligence (AI) refers to the simulation of human intelligence processes by machines, especially computer systems. It encompasses tasks such as learning, reasoning, problem-solving, perception, and language understanding. AI technologies are revolutionizing various fields, from healthcare to finance, by enabling machines to perform tasks that typically require human intelligence.
3. Introduction
Human EGF is a 6045-Da protein with 53 amino acid residues
Epidermal growth factors and their receptors are heavily involved in normal
development, differentiation, migration, wound healing and apoptosis
The discovery of EGF won Stanley Cohen and Rita Levi-Montalcini the Nobel
Prize in Physiology or Medicine in 1986.
EGF is a low-molecular-weight polypeptide first purified from the mouse
submandibular gland, but since then found in many human tissues
including submandibular gland, parotid gland.
Epidermal growth factor can be found in human platelets, macrophages,
urine, saliva, milk, and plasma.
Most EGF family proteins are produced as inactive membrane -anchored
proteins that require proteolytic cleavage either to achieve activity in
solution or bind to cell surface proteoglycans from where they can act as a
reservoir to be made available for receptor binding.
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4. The EGFR belongs to the ErbB family of receptor tyrosine kinases(RTKs).
Is an integral membrane protein
Is 170Kda and contains 1207 aa in humans
These receptors possess protein tyrosine kinase (PTK) activity and are found only in
metazoans.
The four receptor genes, encoding the EGF receptor (EGFR/erbB-1), c-erbB-2/HER2,c-erbB3/
HER3 and c-erbB4/HER4,
ErbB2, ErbB3 as well as ErbB1 are expressed in most epithelial cell layers,
While mesenchymal cells are a rich source of ErbB ligands, both neuregulins and
EGF-like ligands.
ErbB2 cannot be stimulated by any known ligand and ErbB3 is signalling defective
The 11 ligands currently identified for these receptors in mammals include EGF,
transforming growth factor-a (TGF-a), (HB–EGF), amphiregulin (AR),betacellulin (BTC),
epiregulin (EPR), epigen7, neuregulin 1-4, tomoregulin, epiglycan etc
In addition to HER-1, HB–EGF, BTC and EPR bind to and activate HER4
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5. Signaling in EGF
A simple model to analyze signaling is by grouping it in to three layers
The initial, extracellular layer is composed of the ligands and will dimerise to
become active.
If the information in the first layer is sufficient to induce receptor dimerization
is achieved by the s1 domain, Vander walls, hydrophobic interactions.
consequently increase catalytic activity, will constitute the second
The third, intracellular layer of second messenger proteins can bind to
specific sites on the receptors and initiate the signals required to induce the
appropriate response.
it is now evident that most or all of the ErbB family of receptors further
aggregate into oligomers of several hundreds or a few thousand receptors
Erbb2 further has a higher catalytic activity than the rest furthermore when
the other EGFR combine with ErbB2 it wil increase their half life by
decreasing the interaction with c-cb22, AP2.
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6. The EGFR monomer possesses an
extracellular domain consisting of two
ligand binding subdomains (L1 and L2)
and two cysteine-rich domains (S1 and
S2), of which S1 permits EGFR
dimerization with a second ErbB
receptor. SH1 is the protein tyrosine
kinase domain and resides in the
cytoplasmic domain above the six
tyrosine residues available for
transphosphorylation.
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One thing to note is that the receptor may also oligomerize if there is enough ligand
and secondary signals forming an even stronger signal.
Also in the dimerization loop substitution of valine by glutamate results in continuous
dimerization causing transformation.
8. Cont’d
The cytoplasmic region of the EGFR comprises three distinct domains:
1. the juxtamembrane domain, required for feedback by protein kinase C
(PKC), down regulation, epithelial basolateral polarity,
2. the noncatalytic carboxy-terminal tail, possessing the six tyrosine trans
phosphorylation sites mandatory for recruitment of adaptor/effector
proteins (e.g. Grb2 and phospholipase C (PLC) respectively) containing SH2
domains (src homology domain 2) or PTB (phosphotyrosine binding)
domains, plus the motifs necessary for internalization and degradation of
the receptor;
3. the central tyrosine kinase domain (src homology domain 1 (SH1)) that is
responsible for mediating transphosphorylation of the six carboxyterminal
tyrosine residues.
4. it has serine threonine domains when phosphorylated it gets
downgraded
This domain is initially inactive, but once ligand binds it will become active.
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9. ERBB3 further increases the signaling activity by forming dimer with ERBB2
and trans phosphorylating thus recruiting more second messengers or
adapter complexes.
Also stimulates enhanced and prolonged stimulation of the MAP kinase
(ERK) and c-Jun kinase (c-JNK) that would stimulate mobility, and cell cycle
regulators like Mcl-2
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10. the recruitment of the enzyme phospholipase C gamma (PLCγ). In its
inactive state, PLCγ is normally found in the cytosol.
Upon its phosphorylation PLCγ, relocates to the membrane, where it makes
contact with the substrate Phosphatidyl triphosphate and ultimately
generates the second messengers Inositol (1,4,5)P3 and diacylglycerol.
This activates calcium/calmodulin-dependent kinases and stimulation of
protein kinase C.
Protein kinase c that is activated by diacylglycerol phosphorylates NF-Kb
and the inhibitor part is I-kb when I-kb is phosphorylated the NF-Kb is
released and activates various transcriptional factors that would enhance
proliferation and epithelial- mesenchyme transformation
While through the influx of calcium calmodulin is activated and calmodulin
woud phosphorylate calcinurine, calcinurine intun dephosphorylate NFAT,
then NFAT would go to the nucleus and activate transcriptional factors.
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11. The MAPK and PI3K/Akt pathways promote cell proliferative and
survival/antiapoptotic signals via the activation of transcription factors and
up regulation of cyclin D1.
An increase in cyclin D1 that functions to sequester the cyclin kinase
inhibitor p27 and release Cdk2.
Subsequently, Cdk2 becomes positively regulated via its association with
cyclin E and causes deregulation of the G1/S checkpoint such that the cell
cycle progression is promoted and leads to malignant transformation.
The downstream effectors of Akt also serve to sequester p27 such that the
constitutive activation of Akt that arises from c-erbB-2-overexpression is
thought to confer resistance to tumor necrosis factor induced apoptosis.
Anti apoptosis is further upregulated by the release of P21
Furthermore, Akt is known to stimulate endothelial nitric oxide synthase,
matrix metalloproteinase, and telomerase activity.
It also up regulates synthesis if MDM2
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12. Additional actions of c-erbB-2/c-erbB-3 signaling are the PLCγ pathway and
the JAK-STAT pathway.
In JAK-STAT pathway the JAK would phosphorylate STAT and and the STAT
would dimerize and move in to the nucleus activating transcription of
specific gene associated with cell survival.i
mportance of EGF can be shown by this table
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15. The new signaling pathway
discovered!
Recent reports also suggest that following EGF stimulation at the cell
surface, the full-length EGF receptors also migrate to the nucleus, where
they bind an AT-rich consensus sequence (ATRS) via an undefined domain
and enhance transcription via proline-rich region near their carboxy
terminal domain.
They also show that EGFRs associate with the promoter region of cyclin D1,
a protein that can play a key role in mitogenesis.
This changes the so called the “DOGMA” of the action of receptors
It has also been reported the activation of Erbb induces the activation of
more receptors
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16. EGF elicits cancer like phenotype
change
The addition of EGF to normal cells elicits certain responses which are
associated with neoplastic transformation. For example, EGF induces a
partial loss of density dependent inhibition of growth and the dependency
on serum for growth, an increase in the level of phosphotyrosine in proteins
and an increase in cellular metabolism including sugar and amino acid
transport, ATP turnover, and ornithine decarboxylase activity .
EGF induces the expression the mRNA of cfos and c-myc genes, cellular
proto-oncogenes . Cellular proto-oncogenes are the normal cellular
homologs of viral oncogenes.
Oncogenic viruses are thought to have acquired the oncogene from
normal cellular RNA.
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17. EGF also elicits certain responses which are associated with cancer such as
the loss of fibronectin, and an augmentation of the secretion of
plasminogen activator and metalloproteinase.
Growth of cells in soft agar, considered by many to be one of the best
assays for showing the tumorigenicity of a cell, is potentiated by EGF or
EGF-like factors
This potentiation by EGF is even greater for partially transformed cells and
tumor cells. Thus, EGF or EGF-like proteins contribute toward the malignant
phenotype of transformed cells in vivo.
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18. EGF and cancer
The impact of the EGFR signaling system on human neoplasia is shown by
the following:
1. EGFR is overexpressed or activated by autocrine or paracrine growth
factor loops in at least 50% of epithelial malignancies.
2. HER2 is amplified and dramatically overexpressed in approximately 20–
30% of breast cancers and also cervical cancers.
3. HER3 is variably expressed in breast and colon, prostate, and stomach
malignancies.
4. ErbB4 is overexpressed in breast cancer and granulosa cell tumours of the
ovary.
Also, ErbB2 overexpression by itself can cause cellular transformation even in
the absence of added ligand
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19. Also EGF is induced to be released from macrophages by the release of
CSF 1
Then the EGF will stimulate the epithelial to mesenchyme transformation of
the carcinoma,
This transformation aids in metastasis
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20. EGFR and ErbB2 have been showed to be overexpressed in a large
proportion of breast and ovarian tumours, primarily by gene amplification
In cervical cancers, HPV E5 is known to cause overexpression of EGFR.
Recently, ErbB2 was shown to cooperate with HPV viral oncoproteins E6 and
E7 to cause transformation.
The trans membrane receptor Notch1 protein has been shown to
overexpress ErbB2 and this along with the ability of Notch1 to activate the
PI3kinase PKB/Akt pathway and protect cells from apoptosis and to protect
cells from p53-induced cell death could play a major role in the progression
of many cancers like the cancer of the uterine cervix. where Notch is
known to be overexpressed.
It would be interesting to see whether Notch drives PI3kinase through
overexpression of ErbB2 in cervical cancers.
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21. The unaltered wild-type human ErbB2 is amplified or overexpressed in a
subset of breast cancers and this correlates with an aggressive tumour
phenotype, including tumour size, lymph node involvement, high
percentage of S-phase cells, aneuploidy and lack of steroid hormone
receptors
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22. The expression of EGFR protein has also been compared with tumor
differentiation grade.
The results appear to be controversial with some studies showing a link and
others reporting no relationship between tumor differentiation and EGFR
levels.
No significant correlation was demonstrated between patient gender and
patient age
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23. EGFR and colorectal cancer
Enhanced activity or overexpression of EGFR has been found to be
associated with tumor progression and poor survival in various malignancies
such as head and neck , lung , breast , gastrointestinal tract and bladder
cancers.
It has been well documented that overexpression of EGFR in colon cancer
may be linked to an advanced stage of the disease or may predict a
potential metastatic risk.
However, the impact of EGFR expression on survival remains controversial
and overexpression of EGFR is not uniformly associated with an unfavorable
prognosis.
In most cases, immunohistochemical methods were used for the detection
of EGFR in colorectal cancer. The variability of IHC is well known and thus
EGFR overexpression in colorectal cancerranges from 25% to 82%.
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26. Treatment cont’d
The treatment with antibody against EGF is out of the option due to the
fact that EGF is a small half life.
Herceptin has enjoyed a little success in treatment of breast cancer
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27. Reference
Study journal of cancer by stoscheck
Science magazine
www.kent.ac.uk/bio/gullick
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Goes with para 2 in contrast to many of the serine/threonine kinase families, which are conserved throughout eukaryotes and are found in both unicellular and multicellular organisms
Was the first rtk to be discovered
For hb egf blastocyst implantation, wound healing, atheroschelerosis
Amphiregulin acts as both inhibitory and activating