Testing the Addition of an Anti-cancer Drug, BAY 1895344, to Usual Chemotherapy for Advanced Stage Solid Tumors, With a Specific Focus on Patients With Small Cell Lung Cancer, Poorly Differentiated Neuroendocrine Cancer, and Pancreatic Cancer

Description

PRIMARY OBJECTIVES:

I. To assess safety and tolerability of each of the elimusertib (BAY 1895344) plus topoisomerase 1 (top1) inhibitor (irinotecan hydrochloride [irinotecan] or topotecan hydrochloride [topotecan]) combinations.

II. To estimate maximum tolerated dose (MTD) and recommended phase 2 dose (RP2D) of each of the combinations.

SECONDARY OBJECTIVES:

I. To observe and record anti-tumor activity. II. To estimate objective response rate (ORR), progression free survival (PFS), overall survival (OS) and duration of response (DOR) in patients treated with each combination.

III. To estimate plasma pharmacokinetic (PK) characteristics of BAY 1895344 plus each top1 inhibitor (irinotecan or topotecan) when used in combination.

IV. To estimate changes in pharmacodynamic (PD) markers of deoxyribonucleic acid (DNA) damage (gamma-H2AX, phosphorylated [p]S343-NBS1) elicited by each combination from on-treatment tumor biopsies (in dose expansion cohorts only).

EXPLORATORY OBJECTIVES:

I. To estimate response outcomes (ORR, PFS, OS, DOR) in study patients by tumor ataxia telangiectasia mutated (ATM) expression loss (assessed by immunohistochemistry [IHC]).

II. To estimate response outcomes (ORR, PFS, OS, DOR) in study patients with tumor DNA damage response (DDR) mutations (assessed by whole exome sequencing [WES], ribonucleic acid [RNA] sequencing [RNA Seq], and circulating tumor DNA [ctDNA] analysis).

OUTLINE: This is a dose-escalation study. Patients are assigned to 1 of 3 cohorts.

COHORT I: Patients receive elimusertib orally (PO) twice daily (BID) on days 1 and 2 and irinotecan intravenously (IV) over 90 minutes on day 1 of each cycle. Cycles repeat every 14 days in the absence of disease progression or unacceptable toxicity. Patients undergo computed tomography (CT) and/or magnetic resonance imaging (MRI) throughout the study, tumor biopsy at screening and on study, and collection of blood samples at screening.

COHORT II: Patients receive elimusertib PO once daily (QD) on days 2, 3, 9, 10, 16, and 17 of cycle 1 and 2, and on days 2, 3, 9, and 10 of each cycle thereafter. Patients receive irinotecan IV over 90 minutes on days 1, 8, and 15 of cycle 1 and 2, and on days 1 and 8 of each cycle thereafter. Cycles repeat every 21 days in the absence of disease progression or unacceptable toxicity. Patients undergo CT and/or MRI throughout the study, tumor biopsy at screening and on study, and collection of blood samples at screening.

COHORT III: Patients receive elimusertib PO QD on days 2 and 5 and topotecan IV over 30 minutes on days 1-5 of each cycle. Cycles repeat every 21 days in the absence of disease progression or unacceptable toxicity. Patients undergo CT and/or MRI throughout the study, tumor biopsy at screening and on study, and collection of blood samples at screening.

After completion of study treatment, patients are followed every 2 months for up to 6 months.