Phase 1/2 Study of TP-0903 (an Inhibitor of AXL Kinase) in Patients With Previously Treated CLL

Chronic Lymphocytic Leukemia Clinical Trial

Official title: A Combined Phase 1/2 Study to Investigate the Safety, Pharmacokinetics, Pharmacodynamics, and Clinical Activity of TP-0903 in Patients With Previously Treated Chronic Lymphocytic Leukemia (CLL)

Status Terminated

Clinical Trial Summary

TP-0903 is an inhibitor of AXL kinase. TP-0903 has shown potent inhibition of AXL kinase and other TAM family members in a biochemical kinase assay. TP-0903 demonstrates corresponding activity in cancer cell lines and mouse xenograft efficacy models. TP-0903 is shown to block cancer cell epithelial-to-mesenchymal transitions. AXL was identified as a potential therapeutic target in chronic lymphocytic leukemia (CLL). TP 0903 was shown to induce apoptosis in CLL B-cells taken directly from patients.TP-0903 was equally potent against CLL cells regardless of risk-factor.

TP-0903 is a novel oral inhibitor that targets AXL kinase and reverses the mesenchymal phenotype associated with advanced cancers. TP-0903 has demonstrated profound single agent activity in CLL B cells taken directly from patients even if the patient has high risk factors (ie, 17p/P53 deletions) or progressed on other agents (ie, ibrutinib). TP-0903 is currently being evaluated in patients with refractory solid tumors (TP-0903-101). This proposed study is designed to identify the maximum tolerated dose (MTD), safety profile and recommended Phase 2 dose (RP2D) of TP-0903 in patients with previously treated CLL. Treatment cycles may be repeated if the patient continues to show benefit and if TP-0903 is reasonably well tolerated.

The study will investigate the safety, pharmacokinetics, pharmacodynamics, and clinical activity of TP-0903.

Clinical Trial Description

This is a combined Phase 1/2 study of oral TP-0903 in patients with previously treated CLL/SLL. In both Phase 1 and Phase 2, study participants will be assigned to one of two defined patient groups:

• Group 1 (TP-0903 monotherapy): Patients with CLL/SLL who are intolerant to, or have progressed on, B-cell receptor antagonists and/or BCL-2 antagonists

• Group 2 (TP-0903 and ibrutinib combination therapy): Patients with CLL/SLL who have progressed on ibrutinib yet the treating provider considers continuation of ibrutinib therapy to be in the best interest of the patient.

Both groups of patients will be treated identically with TP 0903 and will undergo the same study assessments.

Phase 1 Patients will be enrolled in Group 1 and Group 2 in cohorts of 3 to 6 patients simultaneously. Group 2 will start at one dose level below the Group 1 starting dose. In each group, escalation of the TP-0903 dose will follow a standard 3+3 design with sequential cohorts of three patients treated with incrementally higher doses of TP 0903 until a dose-limiting toxicity (DLT) is observed and the maximum tolerated dose (MTD) is established. In the absence of DLTs, the dose will be increased using a modified Fibonacci dose escalation scheme.

Once the MTD or preliminary RP2D is identified, an expansion cohort of up to 6 patients will be enrolled in each patient group to confirm safety/suitability of the preliminary RP2D, to collect additional biomarker data, and to further explore efficacy.

It is expected that up to 27 patients will be enrolled in each patient group for a total of up to 54 patients (TP-0903 monotherapy and combination therapy with ibrutinib).

Additional dose levels, schedules, or disease indications of TP 0903 may be explored, as appropriate, based on the modulation of key biomarkers and the safety profile and clinical signals of activity.

Phase 2 In Phase 2, patients will be enrolled in Group 1 (TP 0903 monotherapy) and Group 2 (TP-0903 combination therapy with ibrutinib) based on the Simon 2 stage design. In Stage 1, up to 13 patients will be enrolled into each patient group (total of 26 patients). If there are no responses among these 13 patients in each group, the study will be stopped. Otherwise, Stage 2 will open to enroll 14 additional patients in each group for a total of 27 patients per group. If 4 or more responses are observed among 27 patients, the conclusion will be that the study treatment is worthy of further investigation.

If both patient groups enroll through Stage 2, it is anticipated that the total enrollment for Phase 2 will be 54 patients. ;

Related Conditions & MeSH terms

• Chronic Lymphocytic Leukemia
• CLL
• Leukemia
• Leukemia, Lymphocytic, Chronic, B-Cell
• Leukemia, Lymphoid
• SLL
• Small Lymphocytic Lymphoma

• NCT number: NCT03572634
• Study type: Interventional
• Source: Sumitomo Pharma America, Inc.
• Status: Terminated
• Phase: Phase 1/Phase 2
• Start date: June 10, 2019
• Completion date: January 21, 2020