NCT06337630

A Study on Tuvusertib (Oral ATR Inhibitor) in Combination With PLX038 (Topo1 Inhibitor) in Patients With Advanced Solid Tumors

A Phase I Study on Tuvusertib (Oral ATR Inhibitor) in Combination With PLX038 (Topo1 Inhibitor) With Dose Expansion Cohorts in Patients With Advanced Solid Tumors

• Status: Terminated
• Phase: Phase 1
• Study type: Interventional
• Enrollment: 10 (actual)
• Sponsor: Institut Curie · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

Phase I with a dose finding cohort, followed by expansion cohorts in pre-specified tumor types.

Detailed description

This is an open label, multi-centric phase I with, first, a dose escalation step using an adaptation of the Bayesian Optimal INterval (BOIN) drug-combination, followed by 2 dose expansion cohorts using the Simon 2-stage design. Dose escalation step Dose escalation will be conducted on the grid defined by the 4 doses of PLX038 (800 mg/m², 1000 mg/m², 1300 mg/m² and 1700 mg/m² IV every 21 days D1=D22) and 3 doses of Tuvusertib (90 mg, 130 mg and 180 mg QD for 10 days from D3, D3-12). Premedication with anti-emetic agents is not required prior to the initial infusion, but may be used for an individual patient, as needed. starting combination level is c1 (PLX038 800mg/m2 and Tuvusertib 90mg). Groups of 3 patients will be sequentially enrolled. One week between the enrollment of the 1st patient and the 2 following patients is mandatory at a new combination level. The decision to (de)-escalate one of the two agents depends on the outcome of all patients treated at the current combination. Expansion cohorts Two expansion cohorts are planned, investigating the efficacy and safety in pre-specified populations of interest. Patients will be treated at the RP2D; 25 evaluable patients are needed in each cohort, to account for possible non evaluable patients, up to 28 patients will be enrolled in each cohort. Patients enrolled in the phase I part at the RP2D and fulfilling the eligibility criteria of one of the expansion cohorts will be counted in those 25 evaluable patients.

Conditions

• Solid Tumor

Interventions

Type	Name	Description
DRUG	PLX038 + Tuvusertib	Dose escalation will be conducted on the grid defined by the 4 doses of PLX038 (800 mg/m², 1000 mg/m², 1300 mg/m² and 1700 mg/m² IV every 21 days D1=D22) and 3 doses of Tuvusertib (90 mg, 130 mg and 180 mg QD for 10 days from D3, D3-12). Premedication with anti-emetic agents is not required prior to the initial infusion, but may be used for an individual patient, as needed. All included patients will receive PLX038 + Tuvusertib until progression of disease, unacceptable toxicity, patient withdrawal of consent, investigator decision, lost to follow-up, death, patient non-compliance, or study termination by Sponsor.

Timeline

• Start date: 2025-01-20
• Primary completion: 2025-11-24
• Completion: 2025-11-24
• First posted: 2024-03-29
• Last updated: 2026-01-02

Locations

2 sites across 1 country: France