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|Ref Type||Journal Article|
|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||Clinical cancer research : an official journal of the American Association for Cancer Research|
|Date||2017 Jan 01|
|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.|
|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, Feb 2021).|
|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, Apr 2021).|
|Molecular Profile||Indication/Tumor Type||Response Type||Therapy Name||Approval Status||Evidence Type||Efficacy Evidence||References|
|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|
|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|
|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 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|