Phase I/Ib Trial of Inavolisib Plus Palbociclib and Endocrine Therapy for PIK3CA-Mutated, Hormone Receptor–Positive, Human Epidermal Growth Factor Receptor 2–Negative Advanced or Metastatic Breast Cancer
Jhaveri K, Accordino M, Bedard P, Cervantes A, Gambardella V, Hamilton E, Italiano A, Kalinsky K, Krop I, Oliveira M, Schmid P, Saura C, Turner N, Varga A, Cheeti S, Hilz S, Hutchinson K, Jin Y, Royer-Joo S, Peters U, Shankar N, Schutzman J, Juric D. Phase I/Ib Trial of Inavolisib Plus Palbociclib and Endocrine Therapy for PIK3CA-Mutated, Hormone Receptor–Positive, Human Epidermal Growth Factor Receptor 2–Negative Advanced or Metastatic Breast Cancer. Journal Of Clinical Oncology 2024, 42: 3947-3956. PMID: 39236276, PMCID: PMC11575912, DOI: 10.1200/jco.24.00110.Peer-Reviewed Original ResearchTreatment-related adverse eventsDrug-drug interactionsPreliminary antitumor activityEndocrine therapyStudy treatmentHuman epidermal growth factor receptor 2-negativeBreast cancerTreatment-related adverse event ratesLack of drug-drug interactionsConfirmed objective response rateLocally advanced/metastatic breast cancerCirculating tumor DNA analysisEffect of study treatmentPK drug-drug interactionsAntitumor activityObjective response ratePhase I/Ib studyHormone receptor-positiveProgression-free survivalAdvanced/metastatic breast cancerTumor DNA analysisBiomarkers of responseMetastatic breast cancerYears of ageReceptor-positivePhase Ib dose-escalation trial of taselisib (GDC-0032) in combination with HER2-directed therapies in patients with advanced HER2+ breast cancer
Grinshpun A, Ren S, Graham N, DeMeo M, Wrabel E, Carter J, Tayob N, Pereslete A, Hamilton E, Juric D, Mayer E, Tolaney S, Krop I, Metzger O. Phase Ib dose-escalation trial of taselisib (GDC-0032) in combination with HER2-directed therapies in patients with advanced HER2+ breast cancer. ESMO Open 2024, 9: 103465. PMID: 38833970, PMCID: PMC11179085, DOI: 10.1016/j.esmoop.2024.103465.Peer-Reviewed Original ResearchProgression-free survivalMaximal tolerated doseHER2+ breast cancerAdverse eventsBreast cancerT-DM1Cohort AHuman epidermal growth factor receptor 2-positiveEpidermal growth factor receptor 2-positiveHER2+) breast cancerMedian progression-free survivalAll-grade adverse eventsAssociated with significant toxicityCirculating tumor DNA analysisDevelopment of acquired resistanceHER2-directed regimensHER2-directed therapyAnti-HER2 therapyHER2-targeted therapyPhase Ib studyTumor DNA analysisPI3KDose escalationImprove disease controlOral inhibitor