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““BiomolecularBiomolecularBiomolecularBiomolecularh i fh i fmechanisms of cancer: mechanisms of cancer:
the clinical perspective”the clinical perspective”Umberto Veronesi, MDUmberto Veronesi, MD
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1902Boveri Somatic MutationTheory
1953DNA Double ElixTheory
1969Oncogene Theory1960Philadelphia chromosome
1969Oncogene Theory
1970Reverse transcriptase
1975Monoclonal antibodiesP l Ch i R i
1990Human Project
1983Polymerase Chain Reaction
1990j
Genoma started
2000Human Genoma project 2000Human Genoma projectconcluded
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The DNA within EnvironmentalThe DNA withineach human cell iseach human cell isconstantly exposedconstantly exposedto damaging agents
of bothenvironmental and d i i
Endogenous
endogenous origin.
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This scenarioThis scenario necessitates constantnecessitates constant
ill th tsurveillance so thatd d lldamaged cells are
li i d d deliminated or damagedDNA is repaired.
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ENVIRONMENTAL AGENTSENVIRONMENTAL AGENTS
DNA DAMAGE
REPAIR MUTATION
NORMAL CELL CANCER CELLNORMAL CELL CANCER CELL
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TheThe knowledgeknowledge onon geneticgeneticThe The knowledgeknowledge on on geneticgeneticalterationalteration ofof cancercancer cellscellsrepresentsrepresents a a fundamental step fundamental step
dd h fh f ll fftowardstowards the future the future controlcontrol ofofcancercancercancercancer..
ThTh ii blbl ii hhThe The mainmain problemproblem isis the the identificationidentification ofof the morethe moreidentificationidentification ofof the more the more promisingpromising fieldsfields ofof investigationinvestigation..p gp g gg
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PREVENTION?PREVENTION?CouldCould the the newnewknowledgeknowledge avoidavoidthe the transformationtransformationff ll llllofof a a normalnormal cellcell
i ti t llll??intointo a a cancercancer cellcell??
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DETECTION?DETECTION?DETECTION? DETECTION? C ldC ld ththCouldCould the the newnewvisionvision leadlead toto thethevision vision leadlead toto the the discoverydiscovery ofof aadiscoverydiscovery ofof a a smallsmall focus focus ofofcancercancer cellscells in in anyanypart part ofof the body?the body?
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TREATMENT?TREATMENT?TREATMENT? TREATMENT? WillWill wewe bebe ableable totoWill Will wewe bebe ableable totoidentifyidentify cellcellidentifyidentify cellcellspecificspecificspecificspecificbiomolecularbiomoleculartargetstargets forfor newlynewlydesigneddesigned agentsagents??
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TheThe identificationidentification ofof cancercancerThe The identificationidentification ofof cancercancer‐‐predisposingpredisposing genesgenes isis oneone ofofpredisposingpredisposing genesgenes isis oneone ofofthethe mostmost promisingpromisingthe the mostmost promisingpromisingapproachesapproaches ((PredictivePredictivepppp ((Medicine) Medicine) forfor the the developmentdevelopment ofof programsprogramsi di d ii didiaimedaimed at at preventingpreventing diseasediseaseonsetonsetonsetonset..
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CancerCancer‐‐predisposingpredisposingp p gp p ggenesgenes cancan conferconfer upup totogenesgenes can can conferconfer up up toto2020‐‐foldfold increaseincrease ofof2020 fold fold increaseincrease ofofdevelopingdeveloping aa specificspecificdevelopingdeveloping a a specificspecifictypetype ofof tumortumortypetype ofof tumortumor..
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(1)(1) MutationsMutations ofofthe the BRCA1BRCA1 and and BRCA2BRCA2 genesgenes, , f df d i 5%i 5% fffoundfound in 5% in 5% ofofbreastbreast cancerscancersbreastbreast cancerscancers, , stronglystronglystronglystronglypredispose predispose totobreastbreast and and ovarianovarian cancercancer. .
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(2)(2) MutationsMutations ofof the the APC APC and and MYHMYH
li k dli k dgenesgenes, , linkedlinked totothethe developmentdevelopmentthe the developmentdevelopmentofof FamilialFamilialAdenomatousAdenomatousP l iP l iPolyposisPolyposispredisposepredispose totopredispose predispose totocolorectalcolorectal cancercancer. .
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(3)(3) MutationsMutations ofof repairrepairgenesgenes ((MLH1, MSH2 MLH1, MSH2
d MSH6)d MSH6) li k dli k d ttand MSH6)and MSH6), , linkedlinked totothethe developmentdevelopment ofofthe the developmentdevelopment ofofLynch Lynch SyndromeSyndrome((HereditaryHereditary NonNon‐‐P l iP l i C l t lC l t lPolyposisPolyposis ColorectalColorectalCancerCancer), account), account forforCancerCancer), account ), account forfor5% 5% ofof colorectalcolorectalcancerscancers. .
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HowHow can can wewe exploit exploit thisthis information information totoplanplan anan effectiveeffectiveplanplan anan effectiveeffective
preventionpreventionpreventionprevention??programmeprogramme??
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PersonsPersons whowho havehave in in theirtheir DNA DNA mutationsmutations predisposingpredisposing toto specificspecific
ff illill ff “hi h“hi htypestypes ofof cancercancer willwill formform “high “high riskrisk”” groupsgroups in thein the populationpopulationriskrisk groupsgroups in the in the populationpopulation..
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EXAMPLEEXAMPLEEXAMPLE:EXAMPLE:
Women Women withwithBRCA1BRCA1‐‐2 2 mutationsmutationsmaymay bebe submittedsubmittedmaymay bebe submittedsubmittedtoto treatmenttreatment whichwhichtoto treatment treatment whichwhichmaymay reduce the reduce the riskriskyyofof breastbreast cancercancer..
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BRCA1BRCA1‐‐2 positive Women2 positive Women
RFenretinide Placebo
and andand andStrict Follow‐up Strict Follow‐up
(MRI l d US) (MRI l d US)(MRI yearly and US) (MRI yearly and US)
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Early diagnosis ofEarly diagnosis of cancer may be yimproved by the detection in the blood ofblood of biomolecularbiomolecular markers or even of circulating
h l i lpathological DNA
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GeneGene expressionexpressionGene Gene expressionexpressionprofilingprofiling hashas beenbeenprofilingprofiling hashas beenbeenexploitedexploited forfor betterbetterexploitedexploited forfor betterbetterprognosisprognosis ofof varyvary typestypesprognosisprognosis ofof varyvary typestypesofof cancercancer avoidingavoidingofof cancercancer avoidingavoidingunnecessaryunnecessary aggressiveaggressiveunnecessaryunnecessary aggressive aggressive treatmentstreatmentstreatmentstreatments..
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TheThe discoverydiscovery ofof geneticgeneticThe The discoverydiscovery ofof geneticgeneticalterationsalterations resultingresulting inin specificspecificalterationsalterations resultingresulting in in specificspecificfunctionalfunctional abnormalitiesabnormalities in in cancercancer cellscells hashas led led toto the the developmentdevelopment ofof a a newnew
titi ff t t dt t d ddgeneration generation ofof targetedtargeted drugsdrugsthatthat bear the promisebear the promise ofof higherhigherthatthat bear the promise bear the promise ofof higherhigherefficacyefficacy and and lowerlower toxicitytoxicity. . efficacyefficacy andand lowerlower toxicitytoxicity..
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Th fi tTh fi t ll ffThe first The first exampleexample ofoftreatmenttreatment basedbased on aon atreatment treatment basedbased on a on a geneticgenetic somaticsomatic mutationmutationgeneticgenetic somaticsomatic mutationmutationwaswas thethe useuse ofof retinoicretinoic acidacidwaswas the the useuse ofof retinoicretinoic acid acid forfor thethe promyelocyticpromyelocyticforfor the the promyelocyticpromyelocyticleukaemialeukaemia (1990)(1990)leukaemialeukaemia (1990)(1990)
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RA destabilizes the PML‐RAR complex, induces terminal differentiation and disease cureinduces terminal differentiation and disease cure
HAT Dnmt
N C R
HDAC
N-CoR
PML
RA
MBD1
RAR
MBD1
RAR A R E
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ThTh ff l ll lThe The useuse ofof monoclonalmonoclonalantibodiesantibodies targetingtargetingantibodiesantibodies targetingtargetingaberrantlyaberrantly activatedactivatedaberrantlyaberrantly activatedactivatedsurfacesurface moleculesmolecules hashassurfacesurface moleculesmolecules hashasbecomebecome routineroutine practicepractice ininbecomebecome routine routine practicepractice in in the treatmentthe treatment ofof differentdifferentthe treatment the treatment ofof differentdifferentcancerscancerscancerscancers..
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An An exampleexample isis TrastuzumabTrastuzumab((H tiH ti )) l ll l((HerceptinHerceptin), a ), a monoclonalmonoclonalantibodyantibody directeddirected againstagainst thetheantibody antibody directeddirected againstagainst the the HER2HER2 receptorreceptor whichwhich isisHER2 HER2 receptorreceptor, , whichwhich isisfrequentlyfrequently constitutivelyconstitutivelyq yq y yyactivatedactivated asas a a resultresult ofof gene gene amplificationamplification in in breastbreast cancercancer..
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Trans-membrane structure of HER-2 receptor
Extracellular domain(632 amino acids)(632 amino acids)Ligand-binding site
Transmembrane domain
Intracellular domain
Transmembrane domain(22 amino acids)Plasma
membraneIntracellular domain(580 amino acids)Tyrosine kinase activity
Cytoplasm
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Indicators of increased Indicators of increased HERHER--22
NormalNormal Amplification/OverexpressionHER2 receptor
protein 3HER2mRNA
1
2
4
CytoplasmNucleus
HER2 DNA
4
1 = ↑ gene copy number2 = ↑ mRNA transcription
Cytoplasmicmembrane
Nucleus
3 = ↑ cell surface receptor protein expression4 = ↑ release of receptor extracellular domain
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AA goodgood exampleexample ofof a “a “magicmagicA A goodgood exampleexample ofof a a magicmagicbulletbullet” ” isis ImatinibImatinib ((GleevecGleevec), ), (( ),),whichwhich actsacts byby directlydirectly interferinginterferingwithwith the the tyrosinetyrosine kinasekinase functionfunctionff thth f if i t it i BCR/ABLBCR/ABLofof the the fusionfusion proteinprotein BCR/ABL BCR/ABL
thatthat isis responsibleresponsible forfor thethethatthat isis responsibleresponsible forfor the the pathogenesispathogenesis ofof chronicchronic myeloidmyeloidp gp g yyleukemialeukemia..
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TheThe useuse ofof imatinibimatinib asas wellwellThe The useuse ofof imatinibimatinib, , asas wellwellasas otherother kinasekinase inhibitorsinhibitorsasas otherother kinasekinase inhibitorsinhibitors, , hashas beenbeen extendedextended toto otherotherhashas beenbeen extendedextended toto otherothertypestypes ofof neoplasmsneoplasms thatthattypestypes ofof neoplasmsneoplasms thatthatbearbear activeactive tyrosinetyrosine kinasekinasebear bear activeactive tyrosinetyrosine kinasekinaseactivityactivityactivityactivity..
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Examples of targeted treatmentsExamples of targeted‐treatments that have proven clinically activethat have proven clinically active
Herceptin (Ab anti‐HER2): Breast Cancer
Tarceva (EFGR inhibitor): Non small Lung CancerTarceva (EFGR‐inhibitor): Non‐small Lung Cancer
Erbitux (Ab anti‐EGFR): Colon Cancer
Gleevec (bcr/abl‐inhibitor):CML, GIST
A ti (Ab ti VEGF) R l/C l CAvastin (Ab anti‐VEGF): Renal/Colon Cancer
Rituxan (Ab anti‐CD20): Lymphomas( ) y p
Mylotarg (Ab anti‐CD33): Leukemias
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Are Are CancerCancer StemStem CellsCells the the nextnext target?target?gg
Anti-proliferative TumorAnti proliferativestrategies
TumorRelapse
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Lymph nodes
Primary Carcinoma
No progression
Carcinoma
p g
Progressiong(Clinical
metastases)
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Non Cancer stem cells No metastasesNon Cancer stem cells No metastases
Cancer Stem Cell MetastasesCancer Stem Cell Metastases
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1.1. ConclusionsConclusions1.1. ConclusionsConclusionsThe identification of gene
1.1. Conclusions Conclusions 1.1. Conclusions Conclusions The identification of gene mutations in “germinal cells” willmutations in germinal cells willidentify the risk of developing a y p gspecific type of cancer (predictivemedicine) imposing intense
ti i hi h i kprevention measures in high‐riskpatientspatients.
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2.2. ConclusionsConclusions2.2. ConclusionsConclusionsSpecific genetic abnormalitiesh i t t l i thhave an important role in the correct diagnosis of many typescorrect diagnosis of many typesof cancer, improving also theof cancer, improving also the possibility to predict the responseto medical and radiologicaltherapies
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33. ConclusionsConclusions33. ConclusionsConclusions
GeneticGenetic mutationsmutations in in cancercancer cellscellsrepresentrepresent a target a target forfor specificspecifictiti l ll l SS ttanticanceranticancer moleculesmolecules. Some . Some typestypes
ofof cancerscancers havehave alreadyalready beenbeen putputofof cancerscancers havehave alreadyalready beenbeen put put under under controlcontrol and and forfor othersothers the the expectationsexpectations are are realisticrealistic. .
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4. Conclusions4. ConclusionsHH itit tt bb kk th tth t thth
4. Conclusions4. ConclusionsHoweverHowever itit mustmust bebe knownknown thatthat the the researchesresearches on DNA and on theon DNA and on theresearchesresearches on DNA and on the on DNA and on the developmentdevelopment ofof a a biomolecularbiomolecularppdrugsdrugs are are highlyhighly expensiveexpensive: the : the costscosts willwill bebe prohibitiveprohibitive forfor a a goodgoodportionportion ofof the worldthe worldportionportion ofof the worldthe world
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5. Conclusions5. Conclusions5. Conclusions5. Conclusions
AllAll thisthis maymay leadlead toto a a furtherfurther gap gap betweenbetween richrich and and poorpoor CountriesCountries. . AA ll i i li i l lili b db dA A novelnovel internationalinternational policy, policy, basedbasedonon solidaritysolidarity isis neededneeded toto allowallowon on solidaritysolidarity isis neededneeded, , toto allowallowallall world world populationpopulation toto havehavep pp paccessaccess toto the the newnew drugsdrugs..
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The futureThe futureThe futureThe futureHave the expectations of the years 2000 been fulfilled?Th i di t bThe immediate answer may be“NO” because cancer is stillNO because cancer is stillthere and 10 million people diep pevery year for the disease.
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WeWe havehave immenselyimmensely improvedimproved ourourknowledgeknowledge on the natureon the nature ofof cancercancerknowledgeknowledge on the nature on the nature ofof cancercancerWeWe havehave nownow a a clearclear maproadmaproad totofuture future solutionssolutions
THEREFORETHEREFORETHEREFORETHEREFORETheThe honesthonest andand realisticrealistic answeranswerThe The honesthonest and and realisticrealistic answeranswer
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