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Phase 1b study of pan-AKT inhibitor vevorisertib alone or with paclitaxel or fulvestrant in PIK3CA/AKT/PTEN-mutated advanced solid tumors.
Cancer 2023 March 28
BACKGROUND: In this first-in-human phase 1b study (ClinicalTrials.gov identifier NCT02761694) of advanced solid tumors with PIK3CA/AKT/PTEN mutations, the authors investigated the safety and efficacy of the pan-AKT inhibitor vevorisertib (MK-4440; ARQ 751) as monotherapy or with paclitaxel or fulvestrant.
METHODS: Patients with histologically confirmed, advanced or recurrent, PIK3CA/AKT/PTEN-mutated solid tumors, measurable disease according to Response Evaluation Criteria in Solid Tumors, version 1.1, and an Eastern Cooperative Oncology Group performance status ≤1 received vevorisertib (dose range, 5-100 mg) alone or with paclitaxel 80 mg/m2 or fulvestrant 500 mg. The primary end point was safety and tolerability. Secondary end points included pharmacokinetics and the objective response rate according to Response Evaluation Criteria in Solid Tumors, version 1.1.
RESULTS: Of 78 patients enrolled, 58 received vevorisertib monotherapy, 10 received vevorisertib plus paclitaxel, and nine received vevorisertib plus fulvestrant. Dose-limiting toxicity occurred in three patients (vevorisertib monotherapy, n = 2 [grade 3 pruritic and maculopapular rashes]; vevorisertib plus paclitaxel, n = 1 [grade 1 asthenia]). Across doses, treatment-related AEs occurred in 46 patients (79%) with vevorisertib monotherapy, in 10 patients (100%) with vevorisertib plus paclitaxel, and in nine patients (100%) with vevorisertib plus fulvestrant; and grade 3 treatment-related AEs occurred in 13 (22%), 7 (70%), and 3 (33%) patients, respectively. No grade 4/5 treatment-related AEs occurred. Maximum vevorisertib concentrations were reached 1-4 hours after dosing; the elimination half-life ranged from 8.8 to 19.3 hours. The objective response rate was 5% with vevorisertib monotherapy (three partial responses), 20% with vevorisertib plus paclitaxel (two partial responses), and 0% with vevorisertib plus fulvestrant.
CONCLUSIONS: Vevorisertib alone or with paclitaxel or fulvestrant had a manageable safety profile, and vevorisertib alone or with paclitaxel had minimal to modest antitumor activity in this patient population with PIK3CA/AKT/PTEN-mutated advanced solid tumors.
CLINICAL TRIAL REGISTRATION: ClinicalTrials.gov, NCT02761694.
METHODS: Patients with histologically confirmed, advanced or recurrent, PIK3CA/AKT/PTEN-mutated solid tumors, measurable disease according to Response Evaluation Criteria in Solid Tumors, version 1.1, and an Eastern Cooperative Oncology Group performance status ≤1 received vevorisertib (dose range, 5-100 mg) alone or with paclitaxel 80 mg/m2 or fulvestrant 500 mg. The primary end point was safety and tolerability. Secondary end points included pharmacokinetics and the objective response rate according to Response Evaluation Criteria in Solid Tumors, version 1.1.
RESULTS: Of 78 patients enrolled, 58 received vevorisertib monotherapy, 10 received vevorisertib plus paclitaxel, and nine received vevorisertib plus fulvestrant. Dose-limiting toxicity occurred in three patients (vevorisertib monotherapy, n = 2 [grade 3 pruritic and maculopapular rashes]; vevorisertib plus paclitaxel, n = 1 [grade 1 asthenia]). Across doses, treatment-related AEs occurred in 46 patients (79%) with vevorisertib monotherapy, in 10 patients (100%) with vevorisertib plus paclitaxel, and in nine patients (100%) with vevorisertib plus fulvestrant; and grade 3 treatment-related AEs occurred in 13 (22%), 7 (70%), and 3 (33%) patients, respectively. No grade 4/5 treatment-related AEs occurred. Maximum vevorisertib concentrations were reached 1-4 hours after dosing; the elimination half-life ranged from 8.8 to 19.3 hours. The objective response rate was 5% with vevorisertib monotherapy (three partial responses), 20% with vevorisertib plus paclitaxel (two partial responses), and 0% with vevorisertib plus fulvestrant.
CONCLUSIONS: Vevorisertib alone or with paclitaxel or fulvestrant had a manageable safety profile, and vevorisertib alone or with paclitaxel had minimal to modest antitumor activity in this patient population with PIK3CA/AKT/PTEN-mutated advanced solid tumors.
CLINICAL TRIAL REGISTRATION: ClinicalTrials.gov, NCT02761694.
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