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|Ref Type||Journal Article|
|Authors||de Bono J, Ramanathan RK, Mina L, Chugh R, Glaspy J, Rafii S, Kaye S, Sachdev J, Heymach J, Smith DC, Henshaw JW, Herriott A, Patterson M, Curtin NJ, Byers LA, Wainberg ZA|
|Title||Phase I, Dose-Escalation, Two-Part Trial of the PARP Inhibitor Talazoparib in Patients with Advanced Germline BRCA1/2 Mutations and Selected Sporadic Cancers.|
|Abstract Text||Talazoparib inhibits PARP catalytic activity, trapping PARP1 on damaged DNA and causing cell death in BRCA1/2-mutated cells. We evaluated talazoparib therapy in this two-part, phase I, first-in-human trial. Antitumor activity, MTD, pharmacokinetics, and pharmacodynamics of once-daily talazoparib were determined in an open-label, multicenter, dose-escalation study (NCT01286987). The MTD was 1.0 mg/day, with an elimination half-life of 50 hours. Treatment-related adverse events included fatigue (26/71 patients; 37%) and anemia (25/71 patients; 35%). Grade 3 to 4 adverse events included anemia (17/71 patients; 24%) and thrombocytopenia (13/71 patients; 18%). Sustained PARP inhibition was observed at doses ≥0.60 mg/day. At 1.0 mg/day, confirmed responses were observed in 7 of 14 (50%) and 5 of 12 (42%) patients with BRCA mutation-associated breast and ovarian cancers, respectively, and in patients with pancreatic and small cell lung cancer. Talazoparib demonstrated single-agent antitumor activity and was well tolerated in patients at the recommended dose of 1.0 mg/day.Significance: In this clinical trial, we show that talazoparib has single-agent antitumor activity and a tolerable safety profile. At its recommended phase II dose of 1.0 mg/day, confirmed responses were observed in patients with BRCA mutation-associated breast and ovarian cancers and in patients with pancreatic and small cell lung cancer. Cancer Discov; 7(6); 620-9. ©2017 AACR.This article is highlighted in the In This Issue feature, p. 539.|
|Molecular Profile||Treatment Approach|
|Gene Name||Source||Synonyms||Protein Domains||Gene Description||Gene Role|
|Drug Name||Trade Name||Synonyms||Drug Classes||Drug Description|
|Talazoparib||Talzenna||BMN673||PARP Inhibitor (Pan) 21||Talzenna (talazoparib) is an inhibitor of PARP1 and PARP2, which prevents the DNA repair of single strand DNA breaks, thus causing the accumulation of DNA strand breaks, genomic instability and apoptosis, and leads to lethality in homologous recombination repair deficient cells (PMID: 28242752). Talzenna (talazoparib) is FDA approved for use in patients with ERBB2 (HER2)-negative breast cancer harboring deleterious or suspected deleterious germline BRCA mutations (FDA.gov).|
|Gene||Variant||Impact||Protein Effect||Variant Description||Associated with drug Resistance|
|Molecular Profile||Indication/Tumor Type||Response Type||Therapy Name||Approval Status||Evidence Type||Efficacy Evidence||References|
|Unknown unknown||Ewing sarcoma||not applicable||Talazoparib||Phase I||Actionable||In a Phase I trial, Talazoparib (BMN-673) treatment in patients with Ewing sarcoma did not result in any objective responses, however, resulted in a clinical benefit rate of 23% (PMID: 28242752).||28242752|
|Unknown unknown||lung small cell carcinoma||not applicable||Talazoparib||Phase I||Actionable||In a Phase I trial, Talazoparib (BMN-673) treatment in patients with lung small cell carcinoma resulted in an objective response rate of 9% (2/23), including two patients with a partial response, and four patients with stable disease for at least 16 weeks (PMID: 28242752).||28242752|