Nipple Aspirate FluidBreast DiseasesVacuumFibrocystic Breast DiseaseBreastFibroadenomaBreast NeoplasmsAdenofibromaCarcinoma, Ductal, BreastMammographyHyperplasiaCarcinoma, Intraductal, NoninfiltratingBreast CystNipplesMenopauseCarcinoma in SituPrecancerous ConditionsBiopsyBiopsy, NeedleRisk FactorsCarcinoma, LobularCase-Control StudiesSensitivity and SpecificityReceptors, EstrogenUltrasonography, MammaryTumor Markers, BiologicalPalpationBreast FeedingMastitisReceptors, ProgesteroneMastectomyNeoplasm InvasivenessProspective StudiesAge FactorsRiskPrognosisPostmenopauseEstrogensParityBreast Neoplasms, MaleCarcinomaImmunohistochemistryMenstruationBody FluidsPremenopauseCohort StudiesMenarcheNeoplasm MetastasisTime FactorsDiagnostic ErrorsCell Line, TumorRisk AssessmentRetrospective StudiesOdds RatioEstrogen Replacement TherapyPredictive Value of TestsIncidenceLymphatic MetastasisMass Screening