2024
Association of higher baseline stress and pain with clinical outcomes: Secondary analysis from Alliance A011502.
Gandhi S, Ballman K, Holmes M, Visvanathan K, Symington B, Carvan M, Matyka C, Weiss A, Winer E, Razaq W, Carey L, Partridge A, Chen W. Association of higher baseline stress and pain with clinical outcomes: Secondary analysis from Alliance A011502. Journal Of Clinical Oncology 2024, 42: 11016-11016. DOI: 10.1200/jco.2024.42.16_suppl.11016.Peer-Reviewed Original ResearchInvasive disease-free survivalBrief Pain InventoryPerceived Stress ScaleOverall survivalPittsburgh Sleep Quality IndexMultivariate Cox modelClinical outcomesBreast cancerCESD-RClinical trialsAssociated with worse clinical outcomesDouble-blind clinical trialCox modelBrief Pain Inventory scoresHormone receptor statusDisease-free survivalEpidemiologic Studies Depression Scale-RevisedCenter for Epidemiologic Studies Depression Scale-RevisedHigher Perceived Stress ScaleBody mass indexNonmetastatic breast cancerSleep qualityCESD-R scoresPerceived Stress Scale scoresPittsburgh Sleep Quality Index scoreEndocrine-Sensitive Disease Rate in Postmenopausal Patients With Estrogen Receptor–Rich/ERBB2-Negative Breast Cancer Receiving Neoadjuvant Anastrozole, Fulvestrant, or Their Combination
X. C, Suman V, Sanati S, Vij K, Anurag M, Leitch A, Unzeitig G, Hoog J, Fernandez-Martinez A, Fan C, Gibbs R, Watson M, Dockter T, Hahn O, Guenther J, Caudle A, Crouch E, Tiersten A, Mita M, Razaq W, Hieken T, Wang Y, Rimawi M, Weiss A, Winer E, Hunt K, Perou C, Ellis M, Partridge A, Carey L. Endocrine-Sensitive Disease Rate in Postmenopausal Patients With Estrogen Receptor–Rich/ERBB2-Negative Breast Cancer Receiving Neoadjuvant Anastrozole, Fulvestrant, or Their Combination. JAMA Oncology 2024, 10: 362-371. PMID: 38236590, PMCID: PMC10797521, DOI: 10.1001/jamaoncol.2023.6038.Peer-Reviewed Original ResearchConceptsNeoadjuvant endocrine therapyBreast cancerWeek 4Neoadjuvant chemotherapyPostmenopausal womenPAM50 subtypesNonluminal tumorsClinical stage II to IIIRate of pathological complete responseClinical trialsHER2)-negative breast cancerPhase 3 randomized clinical trialLuminal B tumorsPathological complete responseLuminal A tumorsEarly-stage diseaseRandomized clinical trialsStage II to IIIAnastrozole armNeoadjuvant anastrozoleTumor Ki67Postmenopausal patientsB tumorsComplete responseA tumorsHER2 heterogeneity and treatment response-associated profiles in HER2-positive breast cancer in the NCT02326974 clinical trial
Li Z, Filho O, Viale G, dell'Orto P, Russo L, Goyette M, Kamat A, Yardley D, Abramson V, Arteaga C, Spring L, Chiotti K, Halsey C, Waks A, King T, Lester S, Bellon J, Winer E, Spellman P, Krop I, Polyak K. HER2 heterogeneity and treatment response-associated profiles in HER2-positive breast cancer in the NCT02326974 clinical trial. Journal Of Clinical Investigation 2024, 134: e176454. PMID: 38300710, PMCID: PMC10977978, DOI: 10.1172/jci176454.Peer-Reviewed Original ResearchPathological complete responseHER2-positive breast cancerHER2 heterogeneityBreast cancerEarly-stage HER2-positive breast cancerHER2-targeted therapyPre-treatment tumorsErbB signalingHER2-targeted antibodiesBasal-like featuresHER2 protein levelsStratification of patientsNational Cancer InstituteNeoadjuvant trialsComplete responseResidual tumorT-DM1Copy number heterogeneityTrastuzumab emtansineERBB2 mRNAImmune infiltrationDownstream pathway componentsClinical challengeClinical trialsTumor
2023
12P HER2DX in HER2-positive (HER2+) inflammatory breast cancer (IBC): A correlative analysis from a phase II clinical trial
Lynce F, Brasó-Maristany F, Waks A, Gonzalez P, Villacampa G, Torres E, Galván P, Brunet L, Anderson L, Perou C, Parker J, Vivancos A, Dilullo M, Simon S, Winer E, Overmoyer B, Mittendorf E, Prat A, Tolaney S. 12P HER2DX in HER2-positive (HER2+) inflammatory breast cancer (IBC): A correlative analysis from a phase II clinical trial. ESMO Open 2023, 8: 101236. DOI: 10.1016/j.esmoop.2023.101236.Peer-Reviewed Original Research
2022
Adjuvant Endocrine Therapy in Premenopausal Breast Cancer: 12-Year Results From SOFT
Francis P, Fleming G, Láng I, Ciruelos E, Bonnefoi H, Bellet M, Bernardo A, Climent M, Martino S, Bermejo B, Burstein H, Davidson N, Geyer C, Walley B, Ingle J, Coleman R, Müller B, Le Du F, Loibl S, Winer E, Ruepp B, Loi S, Colleoni M, Coates A, Gelber R, Goldhirsch A, Regan M, Group F. Adjuvant Endocrine Therapy in Premenopausal Breast Cancer: 12-Year Results From SOFT. Journal Of Clinical Oncology 2022, 41: 1370-1375. PMID: 36493334, PMCID: PMC10419521, DOI: 10.1200/jco.22.01065.Peer-Reviewed Original ResearchConceptsOvarian function suppressionDisease-free survivalAdjuvant endocrine therapyPrimary end pointOverall survivalAdjuvant tamoxifenEndocrine therapyEnd pointBreast cancerHuman epidermal growth factor receptor-2-negative tumoursTamoxifen plus ovarian function suppressionHormone receptor-positive breast cancerReceptor-positive breast cancerClinical trial updateOvarian Function TrialPremenopausal breast cancerHigher baseline riskPrior chemotherapyPremenopausal womenTrial updateClinical trialsBaseline riskMultiple end pointsTamoxifenExemestaneSurrogacy of Pathologic Complete Response in Trials of Neoadjuvant Therapy for Early Breast Cancer
Conforti F, Pala L, Bagnardi V, De Pas T, Colleoni M, Buyse M, Hortobagyi G, Gianni L, Winer E, Loibl S, Cortes J, Piccart M, Wolff AC, Viale G, Gelber RD. Surrogacy of Pathologic Complete Response in Trials of Neoadjuvant Therapy for Early Breast Cancer. JAMA Oncology 2022, 8: 1668-1675. PMID: 36201176, DOI: 10.1001/jamaoncol.2022.3755.Peer-Reviewed Original ResearchConceptsSurrogate end pointsPathologic complete responseEarly breast cancerBreast cancerEnd pointComplete responseClinical outcomesClinical benefitEvent-free survival dataLong-term patient outcomesReliable surrogate end pointsTrial levelPatient clinical benefitPatients' clinical outcomesAccelerated approval processNeoadjuvant RCTNeoadjuvant therapyPatient survivalClinical trialsDrug regulatory policyEffective therapyPathological responsePatient outcomesPatient levelDrug effectsPreclinical and clinical efficacy of trastuzumab deruxtecan in breast cancer brain metastases
Kabraji S, Ni J, Sammons S, Li T, Van Swearingen AED, Wang Y, Pereslete A, Hsu L, DiPiro PJ, Lascola C, Moore H, Hughes M, Raghavendra AS, Gule-Monroe M, Murthy RK, Winer EP, Anders CK, Zhao JJ, Lin NU. Preclinical and clinical efficacy of trastuzumab deruxtecan in breast cancer brain metastases. Clinical Cancer Research 2022, 29: 174-182. PMID: 36074155, PMCID: PMC9811155, DOI: 10.1158/1078-0432.ccr-22-1138.Peer-Reviewed Original ResearchConceptsBreast cancer brain metastasesActive brain metastasesObjective response rateCNS objective response rateCancer brain metastasesBrain metastasesT-DXdPatient-derived xenograftsPDX modelsCohort studyTrastuzumab deruxtecanClinical efficacyClinical trialsHER2-positive breast cancer brain metastasesMetastatic HER2-positive breast cancerResponse rateMulti-institutional cohort studyHER2-positive breast cancerRetrospective multi-institutional cohort studyOrthotopic patient-derived xenograftsRetrospective cohort studyProspective clinical trialsSubset of patientsCentral nervous system activityPivotal clinical trialsA Distinct Chromatin State Drives Therapeutic Resistance in Invasive Lobular Breast Cancer.
Nardone A, Qiu X, Spisak S, Nagy Z, Feiglin A, Feit A, Cohen Feit G, Xie Y, Font-Tello A, Guarducci C, Hermida-Prado F, Syamala S, Lim K, Munoz Gomez M, Pun M, Cornwell M, Liu W, Ors A, Mohammed H, Cejas P, Brock JB, Freedman ML, Winer EP, Fu X, Schiff R, Long HW, Metzger Filho O, Jeselsohn R. A Distinct Chromatin State Drives Therapeutic Resistance in Invasive Lobular Breast Cancer. Cancer Research 2022, 82: 3673-3686. PMID: 35950920, PMCID: PMC9588703, DOI: 10.1158/0008-5472.can-21-3186.Peer-Reviewed Original ResearchConceptsInvasive lobular breast cancerInvasive ductal cancerLobular breast cancerTamoxifen resistanceBreast cancerInferior long-term outcomesTumor progressionLong-term outcomesBreast cancer subtypesPotential therapeutic avenuesDuctal cancerClinical findingsPoor outcomeReceptor axisClinical trialsDisease progressionPatient outcomesPreclinical modelsClinical investigationRelated commentaryTherapeutic avenuesCancer subtypesTherapeutic resistanceCancerClinical samplesp16INK4A-deficiency predicts response to combined HER2 and CDK4/6 inhibition in HER2+ breast cancer brain metastases
Ni J, Kabraji S, Xie S, Wang Y, Pan P, He X, Liu Z, Leone JP, Long HW, Brown MA, Winer EP, Dillon DAR, Lin NU, Zhao JJ. p16INK4A-deficiency predicts response to combined HER2 and CDK4/6 inhibition in HER2+ breast cancer brain metastases. Nature Communications 2022, 13: 1473. PMID: 35304445, PMCID: PMC8933392, DOI: 10.1038/s41467-022-29081-2.Peer-Reviewed Original ResearchConceptsPatient-derived xenograftsBrain metastasesMetastatic HER2-positive breast cancerBiomarker-driven clinical trialsBreast cancer brain metastasesHER2-positive breast cancerOrthotopic patient-derived xenograftsMajority of HER2Cancer brain metastasesCDK4/6 inhibitionProtein immunohistochemistryClinical trialsBreast cancerHER2Tumor suppressor p16INK4aPatientsMetastasisBCBMAbemaciclibTucatinibXenograftsImmunohistochemistryCancerCDK4/6Trials
2021
Adjuvant Trastuzumab Emtansine Versus Paclitaxel in Combination With Trastuzumab for Stage I HER2-Positive Breast Cancer (ATEMPT): A Randomized Clinical Trial
Tolaney SM, Tayob N, Dang C, Yardley DA, Isakoff SJ, Valero V, Faggen M, Mulvey T, Bose R, Hu J, Weckstein D, Wolff AC, Reeder-Hayes K, Rugo HS, Ramaswamy B, Zuckerman D, Hart L, Gadi VK, Constantine M, Cheng K, Briccetti F, Schneider B, Garrett AM, Marcom K, Albain K, DeFusco P, Tung N, Ardman B, Nanda R, Jankowitz RC, Rimawi M, Abramson V, Pohlmann PR, Van Poznak C, Forero-Torres A, Liu M, Ruddy K, Zheng Y, Rosenberg SM, Gelber RD, Trippa L, Barry W, DeMeo M, Burstein H, Partridge A, Winer EP, Krop I. Adjuvant Trastuzumab Emtansine Versus Paclitaxel in Combination With Trastuzumab for Stage I HER2-Positive Breast Cancer (ATEMPT): A Randomized Clinical Trial. Journal Of Clinical Oncology 2021, 39: 2375-2385. PMID: 34077270, DOI: 10.1200/jco.20.03398.Peer-Reviewed Original ResearchConceptsInvasive disease-free survivalT-DM1Breast cancerStage IStage I HER2-positive breast cancerHER2-positive breast cancerHuman epidermal growth factor receptorAdjuvant T-DM1Co-primary objectivesDisease-free survivalPatient-reported outcomesEpidermal growth factor receptorGrowth factor receptorProtocol therapyAnalysis populationTrastuzumab emtansineClinical trialsRelevant toxicityPatientsFactor receptorLess toxicityWeeksTrastuzumabCancerPaclitaxelUpdated Standardized Definitions for Efficacy End Points (STEEP) in Adjuvant Breast Cancer Clinical Trials: STEEP Version 2.0
Tolaney SM, Garrett-Mayer E, White J, Blinder VS, Foster JC, Amiri-Kordestani L, Hwang ES, Bliss JM, Rakovitch E, Perlmutter J, Spears PA, Frank E, Tung NM, Elias AD, Cameron D, Denduluri N, Best AF, DiLeo A, Baizer L, Butler LP, Schwartz E, Winer EP, Korde LA. Updated Standardized Definitions for Efficacy End Points (STEEP) in Adjuvant Breast Cancer Clinical Trials: STEEP Version 2.0. Journal Of Clinical Oncology 2021, 39: 2720-2731. PMID: 34003702, PMCID: PMC10166345, DOI: 10.1200/jco.20.03613.Peer-Reviewed Original ResearchConceptsEfficacy end pointPrimary end pointBreast cancer clinical trialsPrimary cancerCancer clinical trialsEnd pointStandardized definitionsRecurrence rateClinical trialsInvasive disease-free survival eventsTherapy trialsBreast cancer-free survivalDisease-free survival eventsNon-breast cancer deathPrimary efficacy end pointClinical trial end pointsPhase III breast cancer trialsCancer-free survivalSecond primary cancerTrial end pointsAdditional end pointsBreast cancer trialsLow-risk populationPatient-reported outcomesSurvival end pointsImpact of HER2 heterogeneity on treatment response of early-stage HER2-positive breast cancer: phase II neoadjuvant clinical trial of T-DM1 combined with pertuzumab
Filho OM, Viale G, Stein S, Trippa L, Yardley DA, Mayer IA, Abramson VG, Arteaga CL, Spring LM, Waks AG, Wrabel E, DeMeo MK, Bardia A, Dell'Orto P, Russo L, King TA, Polyak K, Michor F, Winer EP, Krop IE. Impact of HER2 heterogeneity on treatment response of early-stage HER2-positive breast cancer: phase II neoadjuvant clinical trial of T-DM1 combined with pertuzumab. Cancer Discovery 2021, 11: candisc.1557.2020. PMID: 33941592, PMCID: PMC8598376, DOI: 10.1158/2159-8290.cd-20-1557.Peer-Reviewed Original ResearchConceptsHER2-positive breast cancerHER2 heterogeneityBreast cancerEarly-stage HER2-positive breast cancerHER2-positive early-stage breast cancerTherapeutic resistancePathologic complete response rateEarly-stage breast cancerNeoadjuvant clinical trialsComplete response rateSubset of patientsHER2 therapyPretreatment biopsiesEvaluable casesCure rateT-DM1Trastuzumab emtansineClinical trialsTreatment strategiesTreatment responseTreatment selectionResponse rateRelated commentaryTherapyIssue featureFactors associated with late risks of breast cancer-specific mortality in the SEER registry
Leone JP, Vallejo CT, Hassett MJ, Leone J, Graham N, Tayob N, Freedman RA, Tolaney SM, Leone BA, Winer EP, Lin NU. Factors associated with late risks of breast cancer-specific mortality in the SEER registry. Breast Cancer Research And Treatment 2021, 189: 203-212. PMID: 33893907, PMCID: PMC8302525, DOI: 10.1007/s10549-021-06233-4.Peer-Reviewed Original ResearchConceptsBC-specific mortalityHR-positive breast cancerHR-negative breast cancerBreast cancerHR statusCumulative riskBreast cancer-specific mortalityCancer-specific mortalityT1a/bHormone receptor statusYear of diagnosisKaplan-Meier analysisLong-term riskBC deathConclusionThe risksGray regressionN2 diseaseLate relapseReceptor statusLate recurrenceSEER registryLater riskClinical trialsYear 5PatientsUtility of the 21-Gene Recurrence Score in Node-Positive Breast Cancer.
Laws A, Garrido-Castro A, Poorvu P, Winer E, Mittendorf E, King T. Utility of the 21-Gene Recurrence Score in Node-Positive Breast Cancer. Oncology 2021, 35: 77-84. PMID: 33577165, DOI: 10.46883/onc.2021.3502.0077.Peer-Reviewed Original ResearchConceptsRecurrence scorePositive nodesClinical trialsBreast cancerHER2-negative breast cancerNode-positive breast cancerLarge population-based registryNode-positive populationAdjuvant chemotherapy useChemotherapy-treated patientsClinical practice guidelinesCurrent practice patternsPopulation-based registryMultiple clinical trialsPotential predictive valueADAPT trialAdjuvant chemotherapyChemotherapy useEndocrine therapyPostmenopausal patientsChemotherapy benefitExcellent outcomesPractice patternsPractice guidelinesRetrospective analysis
2020
Perceptions of patients with early stage breast cancer toward research biopsies
Seah DS, Leone JP, Openshaw TH, Scott SM, Tayob N, Hu J, Lederman RI, Frank ES, Sohl JJ, Stadler ZK, Erick TK, Silverman SG, Peppercorn JM, Winer EP, Come SE, Lin NU. Perceptions of patients with early stage breast cancer toward research biopsies. Cancer 2020, 127: 1208-1219. PMID: 33320362, PMCID: PMC8247276, DOI: 10.1002/cncr.33371.Peer-Reviewed Original ResearchMeSH KeywordsAcademies and InstitutesAdultAgedAged, 80 and overAnalysis of VarianceAttitudeBiomedical ResearchBiopsyBlood DonorsBreastBreast NeoplasmsCancer Care FacilitiesFemaleHealth Services AccessibilityHumansMiddle AgedNeoplasm StagingSocioeconomic FactorsSurveys and QuestionnairesTissue and Organ ProcurementTissue DonorsConceptsEarly-stage breast cancerEarly breast cancerStage breast cancerResearch biopsiesBreast cancerMore patientsClinical trialsBreast biopsyMultivariate analysisProportion of patientsAcademic sitesCommunity oncology practicesPerceptions of patientsPerspectives of patientsCommunity-based sitesCommunity sitesMost patientsOncology sitesModifiable factorsPatients' willingnessUnivariate analysisOncology practiceBiopsyPatientsAcademic centersEffect of Eribulin With or Without Pembrolizumab on Progression-Free Survival for Patients With Hormone Receptor–Positive, ERBB2-Negative Metastatic Breast Cancer
Tolaney SM, Barroso-Sousa R, Keenan T, Li T, Trippa L, Vaz-Luis I, Wulf G, Spring L, Sinclair NF, Andrews C, Pittenger J, Richardson ET, Dillon D, Lin NU, Overmoyer B, Partridge AH, Van Allen E, Mittendorf EA, Winer EP, Krop IE. Effect of Eribulin With or Without Pembrolizumab on Progression-Free Survival for Patients With Hormone Receptor–Positive, ERBB2-Negative Metastatic Breast Cancer. JAMA Oncology 2020, 6: 1598-1605. PMID: 32880602, PMCID: PMC7489368, DOI: 10.1001/jamaoncol.2020.3524.Peer-Reviewed Original ResearchConceptsProgression-free survivalObjective response rateTumor-infiltrating lymphocytesTumor mutational burdenPD-L1 statusOverall survivalHormonal therapyPrior linesPD-L1Clinical trialsMedian numberDay 1Cell death ligand 1 (PD-L1) inhibitorsERBB2-negative metastatic breast cancerMedian progression-free survivalDeath ligand 1 (PD-L1) inhibitorsEnd pointCause adverse eventsEfficacy of eribulinHormone receptor positiveMulticenter phase 2PD-L1 22C3Treatment-related deathsLines of chemotherapyPrimary end pointSerial Analysis of Circulating Tumor Cells in Metastatic Breast Cancer Receiving First-Line Chemotherapy
Magbanua MJM, Hendrix LH, Hyslop T, Barry WT, Winer EP, Hudis C, Toppmeyer D, Carey LA, Partridge AH, Pierga JY, Fehm T, Vidal-Martínez J, Mavroudis D, Garcia-Saenz JA, Stebbing J, Gazzaniga P, Manso L, Zamarchi R, Antelo ML, De Mattos-Arruda L, Generali D, Caldas C, Munzone E, Dirix L, Delson AL, Burstein HJ, Qadir M, Ma C, Scott JH, Bidard FC, Park JW, Rugo HS. Serial Analysis of Circulating Tumor Cells in Metastatic Breast Cancer Receiving First-Line Chemotherapy. Journal Of The National Cancer Institute 2020, 113: 443-452. PMID: 32770247, PMCID: PMC8023821, DOI: 10.1093/jnci/djaa113.Peer-Reviewed Original ResearchConceptsProgression-free survivalFirst-line chemotherapyOverall survivalBaseline CTCsCTC statusPrognostic groupsInferior progression-free survivalMetastatic breast cancer patientsFuture prospective clinical trialsNovel prognostic groupsMetastatic breast cancerProspective clinical trialsRisk stratification strategiesBreast cancer patientsCourse of treatmentMore effective treatmentsUndetectable CTCsMBC patientsHazard ratioPoor outcomePrognostic significanceCox regressionCancer patientsClinical trialsCTC measurementBarriers to Clinical Trial Accrual: Perspectives of Community-Based Providers
Knelson LP, Cukras AR, Savoie J, Agarwal A, Guo H, Hu J, Fell G, Lederman R, Hughes ME, Winer EP, Lin NU, Tolaney SM. Barriers to Clinical Trial Accrual: Perspectives of Community-Based Providers. Clinical Breast Cancer 2020, 20: 395-401.e3. PMID: 32605813, DOI: 10.1016/j.clbc.2020.05.001.Peer-Reviewed Original ResearchConceptsTrial participationTrial referralClinical trialsBreast cancerNurse practitioners/physician assistantsPatient-related barriersReferral of patientsClinical Trial AccrualCancer enrollMetastatic trialsReferral patternsSurgical oncologistsTrial awarenessReferral practicesTrial investigatorsBreast oncologyTrial knowledgePatientsPhysician assistantsTrial optionsMedical education coursesPatient interestReferralProvider perspectivesLogistical barriers
2019
Identifying ERBB2 Activating Mutations in HER2-Negative Breast Cancer: Clinical Impact of Institute-Wide Genomic Testing and Enrollment in Matched Therapy Trials.
Exman P, Garrido-Castro AC, Hughes ME, Freedman RA, Li T, Trippa L, Bychkovsky BL, Barroso-Sousa R, Di Lascio S, Mackichan C, Lloyd MR, Krevalin M, Cerami E, Merrill MS, Santiago R, Crowley L, Kuhnly N, Files J, Lindeman NI, MacConaill LE, Kumari P, Tolaney SM, Krop IE, Bose R, Johnson BE, Ma CX, Dillon DA, Winer EP, Wagle N, Lin NU. Identifying ERBB2 Activating Mutations in HER2-Negative Breast Cancer: Clinical Impact of Institute-Wide Genomic Testing and Enrollment in Matched Therapy Trials. JCO Precision Oncology 2019, 3: 1-9. PMID: 32923853, PMCID: PMC7446367, DOI: 10.1200/po.19.00087.Peer-Reviewed Original ResearchMetastatic breast cancerEligible patientsBreast cancerExact testHER2-negative breast cancerOngoing phase II trialGenomic profilingPhase II trialProportion of patientsComprehensive genomic profilingRoutine clinical practiceFisher's exact testGenomic tumor profilingArchived tissue samplesII trialMedian timeTRIAL REGISTRATIONTrial participationClinical trialsSpecific genomic changesClinical impactGenomic testing resultsRare subsetPatientsClinical practicePIK3CA and MAP3K1 alterations imply luminal A status and are associated with clinical benefit from pan-PI3K inhibitor buparlisib and letrozole in ER+ metastatic breast cancer
Nixon MJ, Formisano L, Mayer IA, Estrada MV, González-Ericsson PI, Isakoff SJ, Forero-Torres A, Won H, Sanders ME, Solit DB, Berger MF, Cantley LC, Winer EP, Arteaga CL, Balko JM. PIK3CA and MAP3K1 alterations imply luminal A status and are associated with clinical benefit from pan-PI3K inhibitor buparlisib and letrozole in ER+ metastatic breast cancer. Npj Breast Cancer 2019, 5: 31. PMID: 31552290, PMCID: PMC6757060, DOI: 10.1038/s41523-019-0126-6.Peer-Reviewed Original ResearchMetastatic breast cancerClinical benefitBreast cancerPan-PI3K inhibitor buparlisibHuman epidermal growth factor 2Epidermal growth factor 2K inhibitorsPan-PI3K inhibitorPhase Ib studySubset of patientsPI3KBreast cancer cell linesPI3K inhibitorsPAM50 analysisCancer cell linesEndocrine therapyGrowth factor 2Only biomarkerPIK3CA mutationsClinical trialsMetastatic tissuesTherapeutic combinationsIb studyPatientsBuparlisib