Irofulven in AR-targeted and Docetaxel-Pretreated mCRPC Patients With Drug Response Predictor (DRP®)

Phase II Study of Irofulven in AR-targeted and Docetaxel-Pretreated Metastatic Castration-Resistant Prostate Cancer Patients, Who Have a Drug Response Predictor (DRP®) Indicating a High Likelihood of Response to Irofulven.

The study seek to evaluate the anti-tumor effect after treatment of Irofulven in combination with prednisolone in patients who progressed on androgen receptor(AR)-targeted therapy and Docetaxel-Pretreated Metastatic Castration-Resistant Prostate Cancer Patients. A drug response predictor (DRP®) biomarker in prostate cancer patients will identify patients likely to respond to and benefit from treatment with Irofulven.

Study Overview

• Status: Active, not recruiting
• Conditions: Metastatic Castration-Resistant Prostate Cancer Patients
• Intervention / Treatment: Drug: Irofulven; Combination product: Prednisolone 10 mg

• Study Type: Interventional
• Enrollment (Estimated): 27
• Phase: Phase 2

Contacts and Locations

Study Locations

• Denmark
  • Copenhagen, Denmark, 2100
    • Rigshospitalet, Dept. Of Oncology

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years and older (Adult, Older Adult)
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

• Have a histologically confirmed adenocarcinoma or poorly differentiated carcinoma of the prostate (carcinomas with pure small-cell histology or pure high grade neuroendocrine histology are excluded; neuroendocrine differentiation is allowed)
• Surgically or medically castrated, with serum testosterone levels of ≤ 50 ng/dL. For patients currently being treated with luteinizing hormone-releasing hormone (LHRH) agonists, i.e., patients who have not undergone an orchiectomy, therapy must be continued throughout the study
• Have evidence of disease progression after prior therapy for mCRPC:
• Disease progression after treatment with at least 1 but no more than 2 prior next-generation AR-targeted therapies (abiraterone acetate, enzalutamide, or investigational AR-targeted agent) for metastatic prostate cancer (treatment with the older anti-androgen therapies such as bicalutamide, flutamide, and nilutamide are not counted toward this limit), AND
• Disease progression after treatment with docetaxel for metastatic prostate cancer. Prior Docetaxel therapy administered for hormone-sensitive disease is permitted and is not counted toward this limit
• Disease progression after initiation of most recent therapy is based on any of the following criteria:
• Rise in PSA: a minimum of 2 consecutive rising levels, with an interval of ≥ 1 week between each determination. The most recent screening measurement must have been ≥ 1 ng/mL
• Transaxial imaging: new or progressive soft tissue masses on CT or MRI scans as defined by RECIST 1.1
• Radionuclide bone scan: at least 2 new metastatic lesions
• Signed informed consent obtained prior to initiation of any study-specific procedures or treatment.
• Age ≥ 18 years
• Life expectancy ≥ 3 months
• Performance status 0 - 1
• Have participated in the Irofulven screening protocol in which the Drug Response Predictor (DRP) outcome is measured as being in the upper limit of response (defined as being in the top 20%). Scaling can be modified depending on the clinical outcome.
• Adequate organ functions
• Hematological: absolute neutrophil count (ANC) >1.5 x 10E9/L, platelet count >100 x 10E9/L, hemoglobin ≥ 6.2 mmol/L
• Hepatic: Bilirubin within normal range, aspartate transaminase (AST) and alanine transaminase (ALT) ≥ 2.5 upper normal limit (UNL), albumin > 25 g/L
• Renal: creatinine clearance ≥ 30 mL/min (calculated according to the Cockcroft and Gault method)
• Recovered to grade 0 or 1 from any toxic effects of prior chemotherapy, radiotherapy

Exclusion Criteria:

• Prior external beam radiation therapy to >25% of the bone marrow
• Contraindication to the use of prednisolone (e.g. uncontrolled diabetes mellitus)
• Prior treatment with Irofulven.
• Ongoing treatment with a corticosteroid at a prednisolone-equivalent dose > 10 mg/day
• More than 1 prior treatment with either isotopes Sm or Sr, or radioisotope treatment or treatment with bisphosphonate agents or antibody treatment i.e., denosumab within 2 months prior to initiation of treatment with investigational Medicinal Product (IMP). Pre-existing treatment with bisphosphonate agents or denosumab is to be continued during the study
• Initiation of treatment with bisphosphonate agents or antibody treatment i.e., denosumab, within 4 weeks of study start. Pre-existing treatment with bisphosphonate agents or denosumab is to be continued during the study
• Treatment with coumarin derivatives and/or phenytoin most be discontinued and coagulation parameters most be within the normal range before treatment with Irofulven
• History of significant gastric or small bowel resection, malabsorption syndrome, or other lack of integrity of the upper gastrointestinal tract that may prevent compliance with oral drug administration
• Presence of any serious concomitant systemic disorders and/or psychiatric condition incompatible with the study (at the investigators discretion)
• History of retinopathy
• Presence of any active infection (at the investigators discretion).
• Central Nervous System Disease (CNS) disease including epilepsy or altered mental status precluding understanding of the informed consent process and/or completion of the necessary study procedures

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Treatment
• Allocation: N/A
• Interventional Model: Single Group Assignment
• Masking: None (Open Label)

Number of Arms

1

Arms and Interventions

Participant Group / Arm

Intervention / Treatment

Experimental: Irofulven + Prednisolone 10mg; Irofulven will be administered as an intravenous dose of 0.45 mg/kg, over a 30-minute infusion period by venous access at day 1 and 8 of a three week cycle. Irofulven will be administered in combination with a daily dose of 10 mg orally administered prednisolone.

Drug: Irofulven; Irofulven will be administered as an intravenous dose of 0.45 mg/kg, over a 30-minute infusion period by venous access at day 1 and 8 of a three week cycle. Irofulven will be administered in combination with a daily dose of 10 mg orally administered prednisolone.; Combination product: Prednisolone 10 mg; Irofulven will be administered as an intravenous dose of 0.45 mg/kg, over a 30-minute infusion period by venous access at day 1 and 8 of a three week cycle. Irofulven will be administered in combination with a daily dose of 10 mg orally administered prednisolone.

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Anti-tumor effect of Irofulven with prednisolone	Objective response rate defined as complete response, partial response or stable disease > 9 weeks according to RECIST 1.1 for patients with measurable disease and defined as stable disease > 9 weeks according to Prostate Cancer Working Group 3 (PCWG3) for bone metastases	one year

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Duration of response (DOR)	Time from documentation of tumor response to disease progression	one year
Radiologic progression free survival (rPFS)	rPFS defined as ≥ two new lesions on an 8-week bone scan plus two additional lesions on a confirmatory scan, ≥ two new confirmed lesions on any scan ≥ 9 weeks after enrolment, and/or progression in nodes or viscera on cross-sectional imaging, or death.	one year
Overall survival	Time from enrolment until death from any cause.	one year
Prostate Specific Antigen (PSA) response	≥ 50% decline in PSA compared to baseline in all patients according to PCWG3	one year
PSA response	≥ 90% decline in PSA compared to baseline in all patients according to PCWG3	one year
Time to PSA progression	PSA progression defined in accordance with PCWG3.	one year

Collaborators and Investigators

• Sponsor: Allarity Therapeutics
• Collaborators: Smerud Medical Research International AS; Lantern Pharma Inc.

Study record dates

Study Major Dates

• Study Start (Actual): October 17, 2018
• Primary Completion (Actual): October 1, 2021
• Study Completion (Estimated): May 1, 2024

Study Registration Dates

• First Submitted: August 21, 2018
• First Submitted That Met QC Criteria: August 21, 2018
• First Posted (Actual): August 22, 2018

Study Record Updates

• Last Update Posted (Actual): July 20, 2023
• Last Update Submitted That Met QC Criteria: July 19, 2023
• Last Verified: July 1, 2023

More Information

Terms related to this study

• Keywords: Drug Response Prediction (DRP)
• Additional Relevant MeSH Terms: Neoplasms; Urogenital Neoplasms; Neoplasms by Site; Genital Neoplasms, Male; Prostatic Diseases; Urogenital Diseases; Male Urogenital Diseases; Genital Diseases, Male; Genital Diseases; Prostatic Neoplasms; Physiological Effects of Drugs; Molecular Mechanisms of Pharmacological Action; Anti-Inflammatory Agents; Antineoplastic Agents; Glucocorticoids; Hormones; Hormones, Hormone Substitutes, and Hormone Antagonists; Antineoplastic Agents, Hormonal; Antineoplastic Agents, Alkylating; Alkylating Agents; Prednisolone; Irofulven
• Other Study ID Numbers: SMR-3165; 2017-003549-72 (EudraCT Number)

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No