分级往往被归属到神经胶质瘤（gliomas）上，后者是产生于脑部或脊髓的支持胶质 ... 被划分为1级和2级（grades 1 and 2）的神经胶质瘤被定义为低级别（low-grade）， ...SkipNavigationCoronavirus(COVID-19)informationforDana-Farberpatients&familiesLearnmoreCOVID-19FactsandResourcesForPatientsandFamiliesForPhysiciansOurResearchAboutUsFindaDoctorAppointments&SecondOpinionsHowYouCanHelpclosenavigationpanelCOVID-19FactsandResourcesForOurPatientsVaccineVirtualVisitsForCaregiversForPhysiciansOurResearchclosenavigationpanelForPatientsandFamiliesWhyDana-FarberCare&TreatmentBecomingaPatientCaringforaLovedOnePrevention&RiskForSurvivorsClinicalTrialsInsurance&FinancialInformationMyDana-FarberEventsCalendarHealthLibraryclosenavigationpanelForPhysiciansReferaPatientEducation&TrainingClinicalResourcesClinicalAdvancesPhysicianGatewayclosenavigationpanelOurResearchClinicalTrialsDepartments,Centers,&LabsInnovationsFeaturedResearchOurResearchersCoreFacilitiesSearchCancerTypesclosenavigationpanelAboutUsLocationsDirectionsCareersNewsroomandPublicationsLeadershipCommunityOutreachAwardsHistoryClinicalTrialsInsurance&FinancialInformationInsightBlogEventsCalendarHealthLibraryclosenavigationpanelAppointments&SecondOpinionsOnlineSecondOpinionProgramInternationalPatientsclosenavigationpanelHowYouCanHelpWaystoGiveEventsGetInvolvedShopGiveNowSearchCOVID-19FactsandResourcesbackCOVID-19FactsandResourcesForOurPatientsVaccineVirtualVisitsForCaregiversForPhysiciansOurResearchForPatientsandFamiliesbackForPatientsandFamiliesWhyDana-FarberCare&TreatmentBecomingaPatientCaringforaLovedOnePrevention&RiskForSurvivorsClinicalTrialsInsurance&FinancialInformationMyDana-FarberEventsCalendarHealthLibraryForPhysiciansbackForPhysiciansReferaPatientEducation&TrainingClinicalResourcesClinicalAdvancesPhysicianGatewayOurResearchbackOurResearchClinicalTrialsDepartments,Centers,&LabsInnovationsFeaturedResearchOurResearchersCoreFacilitiesSearchCancerTypesAboutUsbackAboutUsLocationsDirectionsCareersNewsroomandPublicationsLeadershipCommunityOutreachAwardsHistoryClinicalTrialsInsurance&Financi