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    Imatinib 1

    Imatinib

    Imatinib

    Systematic (IUPAC) name

    4-[(4-methylpiperazin-1-yl)methyl]-N-(4-methyl-3-{[4-(pyridin-3-yl)pyrimidin-2-yl]amino}phenyl)benzamide

    Clinical data

    Trade names Gleevec, Glivec

    AHFS/Drugs.com monograph[1]

    MedlinePlus a606018[2]

    Licence data

    EMA:Link

    [3]

    , US FDA:link

    [4]

    Pregnancy cat. D (AU) D (US)

    Legal status POM (UK) -only (US)

    Routes Oral

    Pharmacokinetic data

    Bioavailability 98%

    Protein binding 95%

    Metabolism Hepatic (mainly CYP3A4-mediated)

    Half-life 18 hours (imatinib)

    40 hours (active metabolite)

    Excretion Fecal (68%) and renal (13%)

    Identifiers

    CAS number 152459-95-5[5]

    220127-57-1[6]

    (mesilate)

    ATC code L01XE01[7]

    PubChem CID 5291[8]

    DrugBank DB00619[9]

    ChemSpider 5101[10]

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    Imatinib 2

    UNII BKJ8M8G5HI[11]

    KEGG D08066[12]

    ChEBI CHEBI:45783[13]

    ChEMBL CHEMBL941[14]

    Chemical data

    Formula C29

    H31

    N7O

    Mol. mass 493.603 g/mol

    589.7 g/mol (mesilate)

    (what is this?) (verify)[15]

    Imatinib (Imatinib Mesylate), marketed by Novartis as Gleevec (USA) or Glivec (Europe/Australia/Latin America),

    is a competitive tyrosine-kinase inhibitor used in the treatment of multiple cancers, most notably of which includes

    Philadelphia Chromosome positive (Ph+

    ) Chronic Myelogenous Leukemia (CML).[16]

    Like all tyrosine-kinaseinhibitors, Imatinib works by blocking a central tyrosine kinase enzyme, in this case, BCR-ABL from

    phosphorylating subsequent proteins and initiating the signaling cascade necessary for cancer development. [17]

    Because the BCR-ABL tyrosine kinase enzyme exists only in cancer cells and not in healthy cells, Imatinib is able to

    function as a targeted cancer therapyonly cancer cells are killed through the drug's action.[18] In this regard,

    Imatinib was one of the first cancer therapies to show the potential for such targeted action and of is often cited as a

    paradigm for research in cancer therapeutics[19]

    Due to the success of Imatinib, the developers of drug were awarded the Lasker Award in 2009 and the Japan Prize

    in 2012.[20][21]

    History

    Imatinib was developed in the late 1990s by biochemist Nicholas Lydon, a former researcher for Novartis, and

    oncologist Brian Druker of Oregon Health & Science University (OHSU). Other major contributions to imatinib

    development were made by Carlo Gambacorti-Passerini, a physician scientist and hematologist at University of

    Milano Bicocca, Italy, John Goldman at Hammersmith Hospital in London, UK, and later on by Charles Sawyers of

    Memorial Sloan-Kettering Cancer Center.[22] Druker led the clinical trials confirming its efficacy in CML.[23]

    Imatinib was developed by rational drug design. After the Philadelphia chromosome mutation and hyperactive

    bcr-abl protein were discovered, the investigators screened chemical libraries to find a drug that would inhibit that

    protein. With high-throughput screening, they identified 2-phenylaminopyrimidine. This lead compound was then

    tested and modified by the introduction of methyl and benzamide groups to give it enhanced binding properties,resulting in imatinib.[24]

    Gleevec received FDA approval in May 2001. On the same month it made the cover of TIME magazine as the

    "magic bullet" to cure cancer. Druker, Lydon and Sawyers received the Lasker-DeBakey Clinical Medical Research

    Award in 2009 for "converting a fatal cancer into a manageable chronic condition".[22]

    Gleevec also holds the record for the drug with the fastest approval time by the FDA. According to Brian Druker,

    one of the developers of Imatinib, the biggest obstacle to being approved was the name of the drug. At that time, the

    drug was being called "Glivec", which is also the current spelling in most parts of the world. However, the United

    States Food and Drug Administration did not want people to mispronounce "Glivec" as "GLIE-VEC" which could be

    confused with a diabetic drug at the time. Therefore, Novartis, the pharmaceutical company who markets Gleevec,

    changed the name of "Glivec" to include two "e's" and avoid the phonetic confusion: Gleevec. Shortly thereafter,

    Gleevec was approved by the FDA.

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    Imatinib 3

    Uses

    Clinical

    Imatinib is used in chronic myelogenous leukemia (CML), gastrointestinal stromal tumors (GISTs) and a number of

    other malignancies. One study demonstrated that imatinib mesylate was effective in patients with systemic

    mastocytosis, including those who had the D816V mutation in c-Kit.[25]

    Experience has shown, however, thatimatinib is much less effective in patients with this mutation, and patients with the mutation comprise nearly 90% of

    cases of mastocytosis.

    Chronic myelogenous leukemia

    The U.S. Food and Drug Administration (FDA) has approved imatinib as first-line treatment for Philadelphia

    chromosome (Ph)-positive CML, both in adults and children. The drug is approved in multiple Ph-positive cases

    CML, including after stem cell transplant, in blast crisis, and newly diagnosed.[26]

    Gastrointestinal stromal tumors

    The FDA first granted approval for advanced GIST patients in 2002. On February 1st, 2012, imatinib was approvedfor use after the surgical removal of KIT-positive tumors to help prevent recurrence. [27] The drug is also approved in

    unresectable KIT-positive GISTs.[26]

    Other approvals

    The FDA has approved imatinib for use in adult patients with relapsed or refractory Ph-positive ALL,

    myelodysplastic/ myeloproliferative diseases associated with platelet-derived growth factor receptor gene

    re-arrangements, aggressive systemic mastocytosis (ASM) without or an unknown D816V c-KIT mutation,

    hypereosinophilic syndrome (HES) and/or chronic eosinophilic leukemia (CEL) who have the FIP1L1-PDGFR

    fusion kinase (CHIC2 allele deletion) or FIP1L1-PDGFR fusion kinase negative or unknown, unresectable,

    recurrent and/or metastatic dermatofibrosarcoma protuberans.[26]

    Plexiform neurofibromas

    For treatment of progressive plexiform neurofibromas associated with neurofibromatosis type I, early research has

    shown potential for using the c-kit tyrosine kinase blocking properties of imatinib.[28][29][30][31][32]

    Experimental

    Imatinib may also have a role in the treatment of pulmonary hypertension. It has been shown to reduce both the

    smooth muscle hypertrophy and hyperplasia of the pulmonary vasculature in a variety of disease processes,

    including portopulmonary hypertension.[33] In systemic sclerosis, the drug has been tested for potential use in

    slowing down pulmonary fibrosis. In laboratory settings, imatinib is being used as an experimental agent to suppress

    platelet-derived growth factor (PDGF) by inhibiting its receptor (PDGF-R). One of its effects is delaying

    atherosclerosis in mice without[34] or with diabetes.[35]

    Mouse animal studies at Emory University in Atlanta have suggested that imatinib and related drugs may be useful

    in treating smallpox, should an outbreak ever occur.[36]

    In vitro studies identified that a modified version of imatinib can bind to gamma-secretase activating protein

    (GSAP), which selectively increases the production and accumulation of neurotoxic beta-amyloid plaques. This

    suggests molecules that target at GSAP and are able to cross bloodbrain barrier are potential therapeutic agents for

    treating Alzheimer's disease.[37] Another study suggests that imatinib may not need to cross the bloodbrain barrier

    to be effective at treating Alzheimer's, as the research indicates the production of beta-amyloid may begin in theliver. Tests on mice indicate that imatinib is effective at reducing beta-amyloid in the brain.[38] It is not known

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    Imatinib 4

    whether reduction of beta-amyloid is a feasible way of treating Alzheimer's, as an anti-beta-amyloid vaccine has

    been shown to clear the brain of plaques without having any effect on Alzheimer symptoms.[39]

    A formulation of imatinib with a cyclodextrin (Captisol) as a carrier to overcome the bloodbrain barrier is also

    currently considered as an experimental drug for lowering and reversing opioid tolerance. Imatinib has shown

    reversal of tolerance in rats.[40] Imatinib is an experimental drug in the treatment of desmoid tumor or aggressive

    fibromatosis.

    Adverse effects

    bcr-abl kinase (green), which causes CML,

    inhibited by imatinib (red; small molecule).

    The most common side effects include: feeling sick (nausea),

    diarrhoea, headaches, leg aches/cramps, fluid retention, visual

    disturbances, itchy rash, lowered resistance to infection, bruising or

    bleeding, loss of appetite;[41] weight gain, reduced number of blood

    cells (neutropenia, thrombocytopenia, anemia), headache, and

    edema.[42]

    Severe congestive cardiac failure is an uncommon but recognized sideeffect of imatinib and mice treated with large doses of imatinib show

    toxic damage to their myocardium.[43]

    If imatinib is used in prepubescent children, it can delay normal

    growth, although a proportion will experience catch-up growth during

    puberty.[44]

    Pharmacology

    Pharmacokinetics

    Imatinib is rapidly absorbed when given by mouth, and is highly bioavailable: 98% of an oral dose reaches the

    bloodstream. Metabolism of imatinib occurs in the liver and is mediated by several isozymes of the cytochrome

    P450 system, including CYP3A4 and, to a lesser extent, CYP1A2, CYP2D6, CYP2C9, and CYP2C19. The main

    metabolite, N-demethylated piperazine derivative, is also active. The major route of elimination is in the bile and

    feces; only a small portion of the drug is excreted in the urine. Most of imatinib is eliminated as metabolites, only

    25% is eliminated unchanged. The half-lives of imatinib and its main metabolite are 18 and 40 hours, respectively. It

    blocks the activity of Abelson cytoplasmic tyrosine kinase (ABL), c-Kit and the platelet-derived growth factor

    receptor (PDGFR). As an inhibitor of PDGFR, imatinib mesylate appears to have utility in the treatment of a variety

    of dermatological diseases. Imatinib has been reported to be an effective treatment for FIP1L1-PDGFRalpha+ mast

    cell disease, hypereosinophilic syndrome, and dermatofibrosarcoma protuberans.[45]

    Mechanism of action

    Imatinib is a 2-phenylaminopyrimidine derivative that functions as a

    specific inhibitor of a number of tyrosine kinase enzymes. It occupies

    the TKactive site, leading to a decrease in activity.

    There are a large number of TK enzymes in the body, including the

    insulin receptor. Imatinib is specific for the TK domain in abl (the

    Abelson proto-oncogene), c-kit and PDGF-R (platelet-derived growth

    factor receptor).

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    Imatinib 5

    In chronic myelogenous leukemia, the Philadelphia chromosome leads to a fusion protein ofabl with bcr(breakpoint

    cluster region), termed bcr-abl. As this is now a constitutively active tyrosine kinase, imatinib is used to decrease

    bcr-abl activity.

    The active sites of tyrosine kinases each have a binding site for ATP. The enzymatic activity catalyzed by a tyrosine

    kinase is the transfer of the terminal phosphate from ATP to tyrosine residues on its substrates, a process known as

    protein tyrosine phosphorylation. Imatinib works by binding close to the ATP binding site of bcr-abl, locking it in aclosed or self-inhibited conformation, and therefore inhibiting the enzyme activity of the protein

    semi-competitively.[46] This fact explains why many BCR-ABL mutations can cause resistance to imatinib by

    shifting its equilibrium toward the open or active conformation.[47]

    Imatinib is quite selective for bcr-ablit does also inhibit other targets mentioned above (c-kit and PDGF-R), but no

    other known tyrosine kinases. Imatinib also inhibits the abl protein of non-cancer cells but cells normally have

    additional redundant tyrosine kinases which allow them to continue to function even if abl tyrosine kinase is

    inhibited. Some tumor cells, however, have a dependence on bcr-abl.[48] Inhibition of the bcr-abl tyrosine kinase

    also stimulates its entry in to the nucleus, where it is unable to perform any of its normal anti-apoptopic functions. [49]

    The Bcr-Abl pathway has many downstream pathways including the Ras/MapK pathway, which leads to increased

    proliferation due to increased growth factor-independent cell growth. It also affects the Src/Pax/Fak/Rac pathway.

    This affects the cytoskeleton, which leads to increased cell motility and decreased adhesion. The

    PI/PI3K/AKT/BCL-2 pathway is also affected. BCL-2 is responsible for keeping the mitochondria stable; this

    suppresses cell death by apoptosis and increases survival. The last pathway that Bcr-Abl affects is the JAK/STAT

    pathway, which is responsible for proliferation.[50]

    Interactions

    Since imatinib is mainly metabolised via the liver enzyme CYP3A4, substances influencing the activity of this

    enzyme change the plasma concentration of the drug. An example of a drug that increases imatinib activity and

    therefore side effects by blocking CYP3A4 is ketoconazole. The same could be true of itraconazole, clarithromycin,grapefruit juice, among others. Conversely, CYP3A4 inductors like rifampicin and St. John's Wort reduce the drug's

    activity, risking therapy failure. Imatinib also acts as an inhibitor of CYP3A4, 2C9 and 2D6, increasing the plasma

    concentrations of a number of other drugs like simvastatin, ciclosporin, pimozide, warfarin, metoprolol, and possibly

    paracetamol. The drug also reduces plasma levels of levothyroxin via an unknown mechanism.[42]

    As with other immunosuppressants, application of live vaccines is contraindicated because the microorganisms in the

    vaccine could multiply and infect the patient. Inactivated and toxoid vaccines do not hold this risk, but may not be

    effective under imatinib therapy.[51]

    Costs

    A box of 400-milligram Glivec tablets, as sold in

    Germany

    The cost of Gleevec for CML has ranged from $32,000[52][53] to

    $98,000[54] a year, and for GIST is $64,800 a year.[55]

    Prices for a 100 mg pill of Gleevec internationally range from $20 to

    $30,[56] although generic imatinib is cheaper.[57]

    Legal challenge to generics

    In 2007, imatinib became a test case through which Novartis

    challenged India's patent laws. A win for Novartis would make it

    http://en.wikipedia.org/w/index.php?title=Indiahttp://en.wikipedia.org/w/index.php?title=Test_casehttp://en.wikipedia.org/w/index.php?title=File%3AGlivec_400mg.jpghttp://en.wikipedia.org/w/index.php?title=Toxoidhttp://en.wikipedia.org/w/index.php?title=Inactivated_vaccinehttp://en.wikipedia.org/w/index.php?title=Live_vaccinehttp://en.wikipedia.org/w/index.php?title=Levothyroxinhttp://en.wikipedia.org/w/index.php?title=Paracetamolhttp://en.wikipedia.org/w/index.php?title=Metoprololhttp://en.wikipedia.org/w/index.php?title=Warfarinhttp://en.wikipedia.org/w/index.php?title=Pimozidehttp://en.wikipedia.org/w/index.php?title=Ciclosporinhttp://en.wikipedia.org/w/index.php?title=Simvastatinhttp://en.wikipedia.org/w/index.php?title=St._John%27s_Worthttp://en.wikipedia.org/w/index.php?title=Rifampicinhttp://en.wikipedia.org/w/index.php?title=Grapefruit_juicehttp://en.wikipedia.org/w/index.php?title=Clarithromycinhttp://en.wikipedia.org/w/index.php?title=Itraconazolehttp://en.wikipedia.org/w/index.php?title=Ketoconazolehttp://en.wikipedia.org/w/index.php?title=Apoptosishttp://en.wikipedia.org/w/index.php?title=Cancer_cellhttp://en.wikipedia.org/w/index.php?title=Tyrosine_kinasehttp://en.wikipedia.org/w/index.php?title=Enzyme_inhibitorhttp://en.wikipedia.org/w/index.php?title=Phosphorylationhttp://en.wikipedia.org/w/index.php?title=Substrate_%28biochemistry%29http://en.wikipedia.org/w/index.php?title=Tyrosinehttp://en.wikipedia.org/w/index.php?title=Phosphatehttp://en.wikipedia.org/w/index.php?title=Catalysishttp://en.wikipedia.org/w/index.php?title=Adenosine_triphosphatehttp://en.wikipedia.org/w/index.php?title=Binding_sitehttp://en.wikipedia.org/w/index.php?title=Active_sitehttp://en.wikipedia.org/w/index.php?title=Tyrosine_kinasehttp://en.wiktionary.org/wiki/constitutivehttp://en.wikipedia.org/w/index.php?title=Philadelphia_chromosomehttp://en.wikipedia.org/w/index.php?title=Chronic_myelogenous_leukemia
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    harder for Indian companies to produce generic versions of drugs still manufactured under patent elsewhere in the

    world. Doctors Without Borders argues a change in law would make it impossible for Indian companies to produce

    cheap generic antiretrovirals (anti-HIV medication), thus making it impossible for Third World countries to buy

    these essential medicines.[58] On 6 August 2007, the Madras High Court dismissed the writ petition filed by Novartis

    challenging the constitutionality of Section 3(d) of Indian Patent Act, and deferred to the World Trade Organization

    (WTO) forum to resolve the TRIPS compliance question. As of 2009 India has refused to grant patent exclusivity. .

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    External links

    NCI Drug Information Summary for Patients (http://www.cancer.gov/cancertopics/druginfo/

    imatinibmesylate)

    Imatinib bound to proteins (http://www.ebi.ac.uk/pdbe-srv/PDBeXplore/ligand/?ligand=STI) in the PDB

    http://en.wikipedia.org/w/index.php?title=Protein_Data_Bankhttp://www.ebi.ac.uk/pdbe-srv/PDBeXplore/ligand/?ligand=STIhttp://www.cancer.gov/cancertopics/druginfo/imatinibmesylatehttp://www.cancer.gov/cancertopics/druginfo/imatinibmesylate
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    Article Sources and Contributors 9

    Article Sources and ContributorsImatinib Source: http://en.wikipedia.org/w/index.php?oldid=531541690 Contributors: 100-bit-machine, A2-25, Aboutmovies, Afterlaws, AlanBarrett, Alice.odin, Alteripse, Alvis, Andries,

    Antelan, Anypodetos, Arcadian, Arvind 1969, AxelBoldt, Axl, Banhgialon, Beetstra, Bluenausea, Brim, Cadmus72, Carlo Banez, Casforty, Chase me ladies, I'm the Cavalry, ChemNerd,

    Chemgirl131, Chris Howard, Chris the speller, Cortamears, Daevatgl, Diberri, Dogcow, Doseiai2, Edgar181, Eleassar, Eloquence, Enkephalin, Eric Kvaalen, Erxnmedia, Fusion114, Fusion57,

    Fuzbaby, Fvasconcellos, Gak, Gigemag76, Gleevec, Gubernator, Gyrofrog, Gzornenplatz, Harijay, Hazard-SJ, HazyM, Hinemash6, Holeung, Hoverflysmiles, IEEE, JWSchmidt, JeremyA,

    Jfdwolff, Joherz, Julesd, Jyril, Katnap01, Kjc2002, Ksheka, Lian053, Linberry, Little green rosetta, Louisajb, Lupin, Martin451, MattKingston, Melaen, Michelle stone1, Nagelfar, Nbauman,

    Nderive, Niceguyedc, Njwyf16, Nohat, Norman21, OHSUKnight, OR Bear, Ozybolairy, Pashihiko, Petersam, P ip2andahalf, Pvosta, Quietvillager, Rbethune, Richard Arthur Norton (1958- ),

    Rod57, Rosalien, Rt34rt34, Rytyho usa, SDC, Sakurambo, SanderB, Selket, Silvaneus, Simplepink, Slambo, Smithbrenon, Snapperman2, Sodium, Spiff666, Stillwaterising, Tavilis, Techelf,TestPilot, TimVickers, TranMH, TylerDurden8823, Vogon77, Wyvern t, Yathirajancrystal, , 136 anonymous edits

    Image Sources, Licenses and Contributorsfile:Imatinib.svg Source: http://en.wikipedia.org/w/index.php?title=File:Imatinib.svg License: Public Domain Contributors: NEUROtiker

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