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What Is Breast Cancer? | CDC

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Breast cancer is a disease in which cells in the breast grow out of control. There are different kinds of breast cancer. The kind of breast cancer depends ... Skipdirectlytositecontent Skipdirectlytopageoptions SkipdirectlytoA-Zlink BreastCancer SectionNavigation CDCHome Facebook Twitter LinkedIn Syndicate WhatIsBreastCancer?Español(Spanish) Minus RelatedPages Thisdiagramofthebreastshowsthelocationofthelobules,lobe,duct,areola,nipple,andfat. resizeiconViewLarger Close downloadiconDownloadImage[JPG] Breastcancerisadiseaseinwhichcellsinthebreastgrowoutofcontrol.Therearedifferentkindsofbreastcancer.Thekindofbreastcancerdependsonwhichcellsinthebreastturnintocancer. Breastcancercanbeginindifferentpartsofthebreast.Abreastismadeupofthreemainparts:lobules,ducts,andconnectivetissue.Thelobulesaretheglandsthatproducemilk.Theductsaretubesthatcarrymilktothenipple.Theconnectivetissue(whichconsistsoffibrousandfattytissue)surroundsandholdseverythingtogether.Mostbreastcancersbeginintheductsorlobules. Breastcancercanspreadoutsidethebreastthroughbloodvesselsandlymphvessels.Whenbreastcancerspreadstootherpartsofthebody,itissaidtohavemetastasized. KindsofBreastCancer Themostcommonkindsofbreastcancerare— Invasiveductalcarcinoma.Thecancercellsbeginintheductsandthengrowoutsidetheductsintootherpartsofthebreasttissue.Invasivecancercellscanalsospread,ormetastasize,tootherpartsofthebody. Invasivelobularcarcinoma.Cancercellsbegininthelobulesandthenspreadfromthelobulestothebreasttissuesthatarecloseby.Theseinvasivecancercellscanalsospreadtootherpartsofthebody. Thereareseveralotherlesscommonkindsofbreastcancer,suchasPaget’sdisease,externaliconmedullary,mucinous,andinflammatorybreastcancer.externalicon Ductalcarcinomainsitu(DCIS)isabreastdiseasethatmayleadtoinvasivebreastcancer.Thecancercellsareonlyintheliningoftheducts,andhavenotspreadtoothertissuesinthebreast. Pagelastreviewed:September22,2021 Contentsource: DivisionofCancerPreventionandControl,CentersforDiseaseControlandPrevention homeBreastCancer BasicInformationplusicon WhatIsBreastCancer? WhatAretheSymptoms? WhatAretheRiskFactors? WhatCanIDotoReduceMyRisk? WhatIsBreastCancerScreening? WhatIsaMammogram? WhatDoesItMeantoHaveDenseBreasts? HowIsBreastCancerDiagnosed? HowIsBreastCancerTreated? Triple-NegativeBreastCancer BreastCancerinYoungWomenplusicon BringYourBraveCampaign AdvisoryCommitteeonBreastCancerinYoungWomenplusicon Members Ex-OfficioMembers Meetings Roster BreastCancerinMen Statistics WhatCDCIsDoing ResourcestoShareplusicon Videos Podcasts ShareableGraphics PrintMaterials StayInformed Facebook Twitter LinkedIn SAS stats ExitNotification/DisclaimerPolicy Close LinkswiththisiconindicatethatyouareleavingtheCDCwebsite. TheCentersforDiseaseControlandPrevention(CDC)cannotattesttotheaccuracyofanon-federalwebsite. Linkingtoanon-federalwebsitedoesnotconstituteanendorsementbyCDCoranyofitsemployeesofthesponsorsortheinformationandproductspresentedonthewebsite. Youwillbesubjecttothedestinationwebsite'sprivacypolicywhenyoufollowthelink. CDCisnotresponsibleforSection508compliance(accessibility)onotherfederalorprivatewebsite. FormoreinformationonCDC'swebnotificationpolicies,seeWebsiteDisclaimers. Cancel Continue

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