Selective AKT kinase inhibitor capivasertib in combination with fulvestrant in PTEN-mutant ER-positive metastatic breast cancer.

Article Details

Citation
Copy to clipboard

Smyth LM, Batist G, Meric-Bernstam F, Kabos P, Spanggaard I, Lluch A, Jhaveri K, Varga A, Wong A, Schram AM, Ambrose H, Carr TH, de Bruin EC, Salinas-Souza C, Foxley A, Hauser J, Lindemann JPO, Maudsley R, McEwen R, Moschetta M, Nikolaou M, Schiavon G, Razavi P, Banerji U, Baselga J, Hyman DM, Chandarlapaty S

Selective AKT kinase inhibitor capivasertib in combination with fulvestrant in PTEN-mutant ER-positive metastatic breast cancer.

NPJ Breast Cancer. 2021 Apr 16;7(1):44. doi: 10.1038/s41523-021-00251-7.

PubMed ID
33863913 [ View in PubMed
]
Abstract

Five to ten percent of ER+ metastatic breast cancer (MBC) tumors harbor somatic PTEN mutations. Loss of function of this tumor-suppressor gene defines a highly aggressive, treatment-refractory disease for which new therapies are urgently needed. This Phase I multipart expansion study assessed oral capivasertib with fulvestrant in patients with PTEN-mutant ER+ MBC. Safety and tolerability were assessed by standard methods. Plasma and tumor were collected for NGS and immunohistochemistry analyses of PTEN protein expression. In 31 eligible patients (12 fulvestrant naive; 19 fulvestrant pretreated), the 24-week clinical benefit rate was 17% in fulvestrant-naive and 42% in fulvestrant-pretreated patients, with objective response rate of 8% and 21%, respectively. Non-functional PTEN was centrally confirmed in all cases by NGS or immunohistochemistry. Co-mutations occurred in PIK3CA (32%), with less ESR1 (10% vs 72%) and more TP53 (40% vs 28%) alterations in fulvestrant-naive versus fulvestrant-pretreated patients, respectively. PTEN was clonally dominant in most patients. Treatment-related grade >/=3 adverse events occurred in 32% of patients, most frequently diarrhea and maculopapular rash (both n = 2). In this clinical study, which selectively targeted the aggressive PTEN-mutant ER+ MBC, capivasertib plus fulvestrant was tolerable and clinically active. Phenotypic and genomic differences were apparent between fulvestrant-naive and -pretreated patients.Trial registration number for the study is NCT01226316.

DrugBank Data that Cites this Article

Drugs