Apalutamide and Abiraterone Acetate in African American and Caucasian Men With Metastatic Castrate Resistant Prostate Cancer (PANTHER)

• ClinicalTrials.gov Identifier: NCT03098836
• Recruitment Status: Active, not recruiting
• First Posted: April 4, 2017
• Last Update Posted: February 8, 2022
• Sponsor: Daniel George, MD
• Collaborator: Janssen Scientific Affairs, LLC
• Information provided by (Responsible Party): Daniel George, MD, Duke University

Study Description

Brief Summary:

The primary goal is to prospectively estimate the median PFS of African American and Caucasian men with mCRPC taking apalutamide, abiraterone acetate, and prednisone. Secondary objectives include: PSA kinetics: to determine the duration of PSA response, time to nadir, and percent of men who achieve a PSA < 0.1; Radiographic assessments: to estimate the rate of objective response and incidence of bone flares; Safety (NCI CTC v4.0) and tolerability, particularly incidence and grade of hypertension in the two populations.

This is a non-comparative pilot open-label, parallel arm, multicenter study of apalutamide and abiraterone acetate in African American and Caucasian men with mCRPC. It is anticipated that 3 additional sites will be needed to accrue 100 subjects (50 African American and 50 Caucasian) over a 24 month accrual period. The study agents will be administerd at the following doses: apalutamide 240mg orally once daily, abiraterone acetate 1000mg orally once daily, and prednisone 5 mg BID in 4-week cycles throughout the treatment period.

Fifty (50) patients will be enrolled in each group (AA and Caucasians). The proportion of patients who experience PSA decline of 30%, 50% and 90% will be estimated with exact 95% confidence intervals based on the binomial distribution will be computed. In addition, post therapy changes in PSA will be explored as a continuous outcome. The Kaplan-Meier product limit method will be used to estimate the rPFS, biochemical PFS and overall survival distributions.

Condition or disease	Intervention/treatment	Phase
Prostate Cancer	Drug: ARN-509; Drug: Abiraterone Acetate; Drug: Prednisone	Phase 2

Study Design

• Study Type: Interventional (Clinical Trial)
• Actual Enrollment: 93 participants
• Allocation: Non-Randomized
• Intervention Model: Parallel Assignment
• Masking: None (Open Label)
• Primary Purpose: Treatment
• Official Title: Prospective Study of Apalutamide and Abiraterone Acetate iN ChemoTHerapy-Naïve mEn With mCRPC Stratified by Race
• Actual Study Start Date: July 10, 2017
• Estimated Primary Completion Date: January 31, 2023
• Estimated Study Completion Date: January 31, 2023

Arms and Interventions

Arm	Intervention/treatment
Experimental: Caucasian	Drug: ARN-509; 240 mg orally daily; Other Name: apalutamide; Drug: Abiraterone Acetate; 1000 mg orally daily; Other Name: Zytiga; Drug: Prednisone; 5 mg orally twice daily (for total daily dose 10 mg)
Experimental: African American	Drug: ARN-509; 240 mg orally daily; Other Name: apalutamide; Drug: Abiraterone Acetate; 1000 mg orally daily; Other Name: Zytiga; Drug: Prednisone; 5 mg orally twice daily (for total daily dose 10 mg)

Outcome Measures

Primary Outcome Measures :

1. Median radiographic progression free survival (PFS) [ Time Frame: every 12 weeks, up to 2 years ]
   Radiographic PFS based on PCWG2 criteria or based on the onset of a skeletal related event. Imaging obtained every 12 weeks.

Secondary Outcome Measures :

1. Change in PSA response [ Time Frame: every 4 weeks, up to 2 years ]
   Duration of PSA response
2. Time to PSA nadir [ Time Frame: every 4 weeks, up to 2 years ]
   Time to PSA nadir
3. Percent of men who achieve a PSA < 0.1 [ Time Frame: every 4 weeks, up to 2 years ]
   Percent of men who achieve a PSA < 0.1
4. Change in radiologic response rates [ Time Frame: every 12 weeks, up to 2 years ]
   RECIST 1.1 defined radiologic response rates and incidence of bone flares
5. Number of adverse events [ Time Frame: up to 2 years ]
   Safety (NCI CTC v4.0) and tolerability, particularly incidence and grade of hypertension in the two populations
6. Overall survival [ Time Frame: every 6 months, up to 3 years ]
   Survival of subjects over the time the study is ongoing

Eligibility Criteria

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

Criteria

Inclusion Criteria:

1. Male, age ≥ 18 years
2. Karnofsky performance status ≥ 70 (Appendix 1)
3. Life expectancy of ≥ 12 months as determined by treating investigator
4. Written Authorization for Use and Release of Health and Research Study Information (HIPAA authorization per institutional requirements)
5. Willing/able to adhere to the prohibitions and restrictions specified in this protocol
6. Willing to take abiraterone acetate on an empty stomach, and should be able to swallow tablets whole, without crushing/chewing tablets. Must have the ability to swallow, retain, and absorb oral medication.
7. Medications known to lower the seizure threshold (see list under prohibited meds, appendix 2) must be discontinued or substituted at least 4 weeks prior to study entry
8. Agrees to use a condom (even men with vasectomies) and another effective method of birth control if he is having sex with a woman of childbearing potential or agrees to use a condom if he is having sex with a woman who is pregnant while on study drug and for 3 months following the last dose of study drug. Must also agree not to donate sperm during the study and for 3 months after receiving the last dose of study drug. Abstinence is an acceptable method of birth control.
9. Adequate bone marrow function as shown by: ANC ≥ 1.0 x 109/L, Platelets ≥ 100 x 109/L, Hb≥9 g/dL, (independent of transfusion and/or growth factors within 3 months prior to Cycle 1 Day 1)
10. Serum potassium ≥ 3.5 mEq/L
11. Serum albumin of ≥ 3.0 g/dl
12. AST/SGOT and ALT/SGPT <2.5 x Institutional Upper Limit of Normal (ULN)
13. Serum total bilirubin ≤ 1.5 x Institutional ULN (Note: In subjects with Gilbert's syndrome, if total bilirubin is >1.5 × ULN, measure direct and indirect bilirubin and if direct bilirubin is ≤1.5 × ULN, subject may be eligible)
14. GFR ≥45 mL/min
15. Histologically confirmed diagnosis of adenocarcinoma of the prostate. Histologic variants of prostate cancer comprising of >50% of the tumor including neuroendocrine features and small cell carcinoma of the prostate are excluded.
16. Radiographic evidence of metastatic disease based on RECIST 1.1 Criteria OR by prostate cancer-specific PET imaging. Evaluable non-target lesions and/or bone only metastasis are permitted per RECIST 1.1 and PCWG3 guidelines. Non-target, pathological lymph nodes ≥ 10 mm and less than 15 mm in the short axis are permitted.
17. Ongoing ADT using an LHRH agonist (e.g. leuprolide, goserelin) or antagonist (e.g. degarelix) must continue on therapy unless prior bilateral orchiectomy has been performed.
18. PSA ≥ 2.0 ng/mL

19. Evidence of castration resistant disease in the setting of ongoing ADT (medical or surgical) as evidenced by one of the following:

    • Absolute rise in PSA of 2.0 ng/mL or an increase >25% from the nadir, minimum 2 consecutive rising PSA levels with an interval of ≥ 1 week between each PSA level, OR
    • CT or MRI based evidence of disease progression (soft tissue, nodal or visceral disease progression) according to PCWG3 criteria or RECIST 1.1 criteria, OR
    • At least 1 new bone scan lesion as compared to the most immediate prior radiologic studies.
20. A minimum of 2 weeks elapsed off of antiandrogen therapy prior to start of study drug (i.e. flutamide, nilutamide, bicalutamide.)
21. A minimum of 2 weeks elapsed off of sipuleucel-T and radiation therapy prior to start of study drug
22. A minimum of 4 weeks from any major surgery prior to start of study drug.
23. Self-reported race of either African American or Caucasian.
24. Ability to understand and the willingness to sign a written informed consent document. If the subject is unable to understand the consent due to comorbidity, such as Alzheimer's disease, consent by a legally authorized representative and assent by the subject will be obtained.

Exclusion Criteria:

1. Prior treatment with abiraterone acetate, enzalutamide, apalutamide (ARN-509), galaterone (TOK-001), orteronel (TAK-700), or similar agent
2. Active infection or other medical condition that would make prednisone/prednisolone (corticosteroid) use contraindicated
3. Active or symptomatic infection including HIV, viral hepatitis or chronic liver disease
4. Any chronic medical condition requiring a higher dose of corticosteroid than 5mg prednisone/prednisolone bid
5. Have known allergies, hypersensitivity, or intolerance to abiraterone acetate, apalutamide or prednisone or their excipients.
6. Pathological finding consistent with small cell carcinoma of the prostate
7. Symptomatic liver or visceral organ metastasis
8. Have a history of gastrointestinal disorders (medical disorders or extensive surgery) that may interfere with the absorption of the study agents
9. Known brain metastasis
10. Prior cytotoxic chemotherapy or biologic therapy for the treatment of CRPC. Note: sipulecel-T is permitted with a 2-week washout.
11. Previously treated with ketoconazole for prostate cancer for greater than 7 days
12. Prior systemic treatment with an azole anti-fungal drug (e.g. fluconazole, itraconazole) within 4 weeks of Cycle 1, Day 1.
13. Uncontrolled hypertension (systolic BP ≥ 140 mmHg or diastolic BP ≥ 90 mmHg). Patients with a history of hypertension are allowed provided blood pressure is controlled by anti-hypertensive treatment
14. Poorly controlled diabetes, FBS ≥200 mg/dL
15. History of pituitary or adrenal dysfunction
16. Symptomatic Atrial Fibrillation, or other symptomatic cardiac arrhythmia
17. Other malignancy, except non-melanoma skin cancer, with a ≥ 30% probability of recurrence within 24 months

18. History of any of the following:

    • Seizure or known condition that may pre-dispose to seizure (e.g. prior stroke within 6 months of Cycle 1 Day 1, brain arteriovenous malformation, Schwannoma, meningioma, or other benign CNS or meningeal disease which may require treatment with surgery or radiation therapy)
    • Severe or unstable angina, myocardial infarction, symptomatic congestive heart failure, arterial or venous thromboembolic events (e.g., pulmonary embolism, cerebrovascular accident including transient ischemic attacks), or clinically significant ventricular arrhythmias within 6 months prior to first dose of study drug. Venous thrombolic events within 6 months are permitted IF they are not attributed to prostate cancer (in the opinion of the treating physician).
19. Avoid concomitant strong CYP3A4 inducers during abiraterone acetate treatment.
20. Avoid co-administration of abiraterone acetate with CYP2D6 substrates that have a narrow therapeutic index. If an alternative treatment cannot be used, exercise caution and consider a dose reduction of the concomitant CYP2D6 substrate
21. Baseline moderate or severe hepatic impairment (Child Pugh Class B & C)
22. Use of herbal products that may decrease PSA levels (i.e., saw palmetto) refer to section 8.3.2 (no washout period required)
23. Administration of an investigational therapeutic within 30 days prior to Cycle 1, Day 1
24. Any condition which, in the opinion of the investigator, would preclude participation in this trial

Contacts and Locations

Locations

United States, Louisiana

Tulane University

New Orleans, Louisiana, United States, 70112

United States, Maryland

Chesapeake Urology Associates

Baltimore, Maryland, United States, 21204

United States, Michigan

Barbara Ann Karmanos Cancer Institute

Detroit, Michigan, United States, 48201

United States, North Carolina

Duke Cancer Center Cary

Cary, North Carolina, United States, 27518

UNC Lineberger Cancer Center

Chapel Hill, North Carolina, United States, 27514

Johnston Hematology and Oncology of Clayton

Clayton, North Carolina, United States, 27520

Duke University Medical Center

Durham, North Carolina, United States, 27710

Maria Parham Hospital

Henderson, North Carolina, United States, 27536

Scotland Memorial Hospital

Laurinburg, North Carolina, United States, 28352

Southeastern Regional

Lumberton, North Carolina, United States, 28358

Johnston Memorial Hospital

Smithfield, North Carolina, United States, 27577

United States, South Carolina

Spartanburg Regional

Spartanburg, South Carolina, United States, 29303

United States, Virginia

Virginia Oncology Associates

Hampton, Virginia, United States, 29303

Virginia Oncology Associates

Norfolk, Virginia, United States, 23502

Sponsors and Collaborators

Daniel George, MD

Janssen Scientific Affairs, LLC

Investigators

• Principal Investigator: Daniel J. George, MD; Duke Cancer Institute

More Information

• Responsible Party: Daniel George, MD, Professor, Duke University
• ClinicalTrials.gov Identifier: NCT03098836
• Other Study ID Numbers: Pro00075097
• First Posted: April 4, 2017
• Last Update Posted: February 8, 2022
• Last Verified: February 2022

• Studies a U.S. FDA-regulated Drug Product: Yes
• Studies a U.S. FDA-regulated Device Product: No

Keywords provided by Daniel George, MD, Duke University:

metastatic; castrate resistant

Additional relevant MeSH terms:

Prostatic Neoplasms; Genital Neoplasms, Male; Urogenital Neoplasms; Neoplasms by Site; Neoplasms; Prostatic Diseases; Prednisone; Abiraterone Acetate; Anti-Inflammatory Agents; Glucocorticoids; Hormones; Hormones, Hormone Substitutes, and Hormone Antagonists; Physiological Effects of Drugs; Antineoplastic Agents, Hormonal; Antineoplastic Agents; Steroid Synthesis Inhibitors; Enzyme Inhibitors; Molecular Mechanisms of Pharmacological Action; Hormone Antagonists; Cytochrome P-450 Enzyme Inhibitors