Reference Detail

Ref Type

Journal Article

PMID

(27126994)

Authors

Mayer IA, Abramson VG, Formisano L, Balko JM, Estrada MV, Sanders ME, Juric D, Solit D, Berger MF, Won HH, Li Y, Cantley LC, Winer E, Arteaga CL

Title

A Phase Ib Study of Alpelisib (BYL719), a PI3Kα-Specific Inhibitor, with Letrozole in ER+/HER2- Metastatic Breast Cancer.

Journal	Vol	Issue	Date	Pages	Journal Short Title
Clinical cancer research : an official journal of the American Association for Cancer Research	23	1	2017 Jan 01	26-34	Clin Cancer Res

URL

Abstract Text

Alpelisib, a selective oral inhibitor of the class I PI3K catalytic subunit p110α, has shown synergistic antitumor activity with endocrine therapy against ER+/PIK3CA-mutated breast cancer cells. This phase Ib study evaluated alpelisib plus letrozole's safety, tolerability, and preliminary activity in patients with metastatic ER+ breast cancer refractory to endocrine therapy.Twenty-six patients received letrozole and alpelisib daily. Outcomes were assessed by standard solid-tumor phase I methods. Tumor blocks were collected for DNA extraction and next-generation sequencing.Alpelisib's maximum-tolerated dose (MTD) in combination with letrozole was 300 mg/d. Common drug-related adverse events included hyperglycemia, nausea, fatigue, diarrhea, and rash with dose-limiting toxicity occurring at 350 mg/d of alpelisib. The clinical benefit rate (lack of progression ≥6 months) was 35% (44% in patients with PIK3CA-mutated and 20% in PIK3CA wild-type tumors; 95% CI, 17%-56%), including five objective responses. Of eight patients remaining on treatment ≥12 months, six had tumors with a PIK3CA mutation. Among evaluable tumors, those with FGFR1/2 amplification and KRAS and TP53 mutations did not derive clinical benefit. Overexpression of FGFR1 in ER+/PIK3CA mutant breast cancer cells attenuated the response to alpelisib in vitro CONCLUSIONS: The combination of letrozole and alpelisib was safe, with reversible toxicities. Clinical activity was observed independently of PIK3CA mutation status, although clinical benefit was seen in a higher proportion of patients with PIK3CA-mutated tumors. Phase II and III trials of alpelisib and endocrine therapy in patients with ER+ breast cancer are ongoing. Clin Cancer Res; 23(1); 26-34. ©2016 AACR.

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Molecular Profile	Treatment Approach

Gene Name	Source	Synonyms	Protein Domains	Gene Description	Gene Role

Therapy Name	Drugs	Efficacy Evidence	Clinical Trials

Drug Name	Trade Name	Synonyms	Drug Classes	Drug Description

Gene	Variant	Impact	Protein Effect	Variant Description	Associated with drug Resistance
PIK3CA	E78K	missense	unknown	PIK3CA E78K lies within the PI3K-ABD domain of the Pik3ca protein (UniProt.org). E78K has been identified in the scientific literature (PMID: 27126994), but has not been biochemically characterized and therefore, its effect on Pik3ca protein function is unknown (PubMed, Mar 2024).
PIK3CA	I273V	missense	unknown	PIK3CA I273V lies within the PI3K-RBD domain of the Pik3ca protein (UniProt.org). I273V has been identified in the scientific literature (PMID: 27126994), but has not been biochemically characterized and therefore, its effect on Pik3ca protein function is unknown (PubMed, Nov 2023).

Molecular Profile	Indication/Tumor Type	Response Type	Therapy Name	Approval Status	Evidence Type	Efficacy Evidence	References
PIK3CA E78K PIK3CA E726K PIK3CA D939G	estrogen-receptor positive breast cancer	no benefit	Alpelisib + Letrozole	Phase Ib/II	Actionable	In a Phase Ib trial, an estrogen-receptor positive breast cancer patient harboring PIK3CA mutations, E78K, D939G, and E726K, demonstrated progressive disease when treated with a combination of Femara (letrozole) and Alpelisib (BYL719) (PMID: 27126994).	27126994
FGFR1 amp	estrogen-receptor positive breast cancer	sensitive	Lucitanib	Preclinical - Cell culture	Actionable	In a preclinical study, an estrogen-receptor positive breast cancer cell line harboring FGFR1 amplification demonstrated sensitivity to treatment with Lucitanib (E-3810) in culture (PMID: 27126994).	27126994
FGFR1 over exp PIK3CA mut	estrogen-receptor positive breast cancer	sensitive	Alpelisib + Lucitanib	Preclinical - Cell culture	Actionable	In a preclinical study, an estrogen-receptor positive breast cancer cell line over expressing FGFR1 and expressing a PIK3CA mutation demonstrated sensitivity to the combination of Alpelisib (BYL719) and Lucitanib (E-3810) in culture (PMID: 27126994).	27126994
FGFR1 amp	estrogen-receptor positive breast cancer	resistant	Alpelisib	Preclinical - Cell culture	Actionable	In a preclinical study, an estrogen-receptor positive breast cancer cell line harboring an FGFR1 amplification demonstrated resistance to Alpelisib (BYL719) in culture (PMID: 27126994).	27126994