POSEIDON trial phase 1B results: Safety, efficacy and circulating tumor DNA response of the beta isoform-sparing PI3K inhibitor taselisib (GDC-0032) combined with tamoxifen in hormone receptor positive metastatic breast cancer patients

Richard D. Baird, Annelot G.J. van Rossum, Mafalda Oliveira, Karin Beelen, Meiling Gao, Mariette Schrier, Ingrid A.M. Mandjes, Javier Garcia-Corbacho, Anne Laure Vallier, Greig Dougall, Erik van Werkhoven, Constanza Linossi, Sanjeev Kumar, Harm van Tinteren, Maurizio Callari, Emma Beddowes, Jose Manuel Perez-Garcia, Hilde Rosing, Else Platte, Petra NederlofMargaret Schot, Aurelia de Vries Schultink, Rene Bernards, Cristina Saura, William Gallagher, Javier Cortes, Carlos Caldas, Sabine C. Linn

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12 Citaten (Scopus)

Samenvatting

Purpose: The strategy of combining endocrine therapy with PI3K-mTOR inhibition has shown promise in estrogen receptor (ER)–positive breast cancer, but new agents and combinations with a better therapeutic index are urgently needed. Taselisib is a potent, selective, beta-isoform–sparing PI3 kinase inhibitor. Patients and Methods: 30 patients with ER-positive, metastatic breast cancer who had failed prior endocrine therapy were treated with escalating doses of taselisib (2 or 4 mg in an intermittent or continuous schedule) combined with tamoxifen 20 mg once daily in this phase 1b study using a "rolling six" design. Results: Taselisib combined with tamoxifen was generally well tolerated, with treatment-emergent adverse events as expected for this class of drugs, including diarrhea (13 patients, 43%), mucositis (10 patients, 33%), and hyperglycemia (8 patients, 27%). No dose-limiting toxicities were observed. Objective responses were seen in 6 of 25 patients with RECIST-measurable disease (ORR 24%). Median time to disease progression was 3.7 months. Twelve of 30 patients (40%) had disease control for 6 months or more. Circulating tumor (ct)DNA studies using next-generation tagged amplicon sequencing identified early indications of treatment response and mechanistically relevant correlates of clinical drug resistance (e.g., mutations in KRAS, ERBB2) in some patients. Conclusions: Taselisib can be safely combined with tamoxifen at the recommended phase 2 dose of 4 mg given once daily on a continuous schedule. Preliminary evidence of antitumor activity was seen in both PIK3CA mutant and wild-type cancers. The randomized phase 2 part of POSEIDON (testing tamoxifen plus taselisib or placebo) is currently recruiting.

Originele taal-2Engels
Pagina's (van-tot)6598-6605
Aantal pagina's8
TijdschriftClinical Cancer Research
Volume25
Nummer van het tijdschrift22
DOI's
StatusGepubliceerd - 15 nov. 2019
Extern gepubliceerdJa

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