Attenuated familial adenomatous polyposis, or AFAP, is a type of polyposis, in which polyps occur on the colon, which can lead to cancer. Read more here.CloseOpenShareonFacebookTwitterGoogle+Email Notice:Usersmaybeexperiencingissueswithdisplayingsomepagesonstanfordhealthcare.org.Weareworkingcloselywithourtechnicalteamstoresolvetheissueasquicklyaspossible.Thankyouforyourpatience. COVID-19Updates:    COVID-19Resources »    VaccineUpdate»    UpdatedVisitorPolicy »     WhatWe'reDoingtoKeepYouSafe »MenuSearchMenuSearchDoctors,Clinics&Locations,Conditions&TreatmentsPatients&VisitorsMyHealthBillingInsuranceMedicalRecordsSupportGroupsFinancialAssistanceCOVID-19ResourceCenterLocationsandParkingVisitorPolicyHospitalCheck-inInternationalPatientsContactUsViewAllInformationforPatients&Visitors»Weareavailabletoassistyou24/7.650-498-3333GuestServices@stanfordhealthcare.orgViewthechangestoourvisitorpolicy » ViewinformationforGuestServices»NewtoMyHealth?ManageYourCareFromAnywhere.AccessyourhealthinformationfromanydevicewithMyHealth. Youcanmessageyourclinic,viewlabresults,scheduleanappointment,andpayyourbill.ALREADYHAVEANACCESSCODE?ActivateAccountDON'THAVEANACCESSCODE?CreateaNewAccountNEEDMOREDETAILS?LearnMoreaboutMyHealth»MyHealthforMobileGettheiPhoneMyHealthapp»GettheAndroidMyHealthapp»WELCOMEBACKForgotUsernameorPassword?NeedHelp?ClearAttenuatedFAPAboutAboutOverviewCausesTumorsuppressorgeneGenotype-phenotypevariationsAttenuatedFAPI1307KmutationDiagnosisSigmoidoscopyColonoscopyTreatmentsPreventionOverviewCausesTumorsuppressorgeneGenotype-phenotypevariationsAttenuatedFAPI1307KmutationDiagnosisSigmoidoscopyColonoscopyTreatmentsPreventionWhatIsAttenuatedFAP?Anattenuatedformoffamilialadenomatouspolyposis(AFAP)hasbeenidentified.IndividualswithAFAPdevelopfewerthan100adenomatouspolyps(averageof30polyps)andthepolypsaremorelikelytooccurontherightsideofthecolonthaninclassicFAP.Theriskofdevelopingcoloncancerisincreased,buttheaverageageofdiagnosisisolder(50to55yearsofage)thanintheclassi