This phase II trial studies how well the combination of apalutamide, abiraterone acetate, and prednisone after chemotherapy work in treating patients that have received no prior treatment (treatment naive) for high risk prostate cancer that is sensitive to androgen deprivation therapy (castration sensitive) and has spread to other parts of the body (metastatic). This study also aims to understand the inheritance of prostate cancer. If a gene or genes that cause prostate cancer can be found, the diagnosis and treatment of prostate cancer may be improved. Testosterone (a male hormone) can cause the growth of prostate cancer cells. Hormone therapy using apalutamide may fight prostate cancer by blocking the use of testosterone by the tumor cells. Antihormone therapy, such as abiraterone acetate, may lessen the amount of testosterone made by the body. Anti-inflammatory drugs such as prednisone lower the body's immune response and are used with other drugs in the treatment of some types of cancer. Apalutamide, abiraterone acetate, and prednisone after chemotherapy may work better in treating patients with castration sensitive prostate cancer.
PRIMARY OBJECTIVE: I. Efficacy of apalutamide in combination with abiraterone acetate + prednisone following docetaxel with ongoing androgen deprivation therapy in men with high risk metastatic castration sensitive disease. SECONDARY OBJECTIVES: I. Safety and tolerability of apalutamide in combination with abiraterone acetate + prednisone following docetaxel with ongoing androgen deprivation therapy. II. Time to event. III. Depth of prostate specific antigen (PSA) response. EXPLORATORY OBJECTIVES: I. Quality of life. II. Falls. III. Molecular changes from prostate cancer over time. OUTLINE: Patients receive apalutamide orally (PO) once daily (QD), abiraterone acetate PO QD, and prednisone PO QD. Cycles repeat every 4 weeks in the absence of disease progression or unacceptable toxicity. Patients also receive androgen deprivation therapy per standard of care. Patients undergo computed tomography (CT) scan, bone scan and blood sample collection throughout the study. After completion of study treatment, patients are followed up every 6 months for up to 10 years.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
TREATMENT
Masking
NONE
Enrollment
7
Given PO
Given ADT per standard of care
Given PO
Given PO
Undergo CT scan
Undergo bone scan
Undergo blood sample collection
Ancillary studies
OHSU Knight Cancer Institute
Portland, Oregon, United States
Complete prostate specific antigen (PSA) response
The complete PSA response is defined as a PSA =\< 0.2 ng/ml, confirmed with a 2nd measurement at least 3 weeks later. The estimated PSA response rate will be computed with 95% exact confidence interval. Binomial exact test will be used to determine whether the complete PSA response rate is significantly greater than 43%.
Time frame: At 12 months from the start of treatment
Overall survival
Overall survival will be assessed with each patient visit. After the subject is off active follow up, survival will be assessed by phone.
Time frame: From day 1 of treatment, assessed up to 10 years
Incidence of adverse events >= grade 2
Determined by Common Terminology Criteria for Adverse Events (CTCAE) version 5.
Time frame: Up to 10 years
Proportion of patients with PSA response >= 50% decrease
The proportion will be reported with 95% confidence interval.
Time frame: From baseline, assessed up to 12 months
Proportion of patients with PSA response >= 90% decrease
The proportion will be reported with 95% confidence interval.
Time frame: From baseline, assessed up to 12 months
Time to treatment failure
Kaplan-Meier plot will be used to describe the survival distributions.
Time frame: From start of treatment, assessed up to 10 years
Time to biochemical (PSA) progression
Kaplan-Meier plot will be used to describe the survival distributions.
Time frame: From start of treatment, assessed up to 10 years
Time to radiographic progression
Kaplan-Meier plot will be used to describe the survival distributions.
Time frame: From start of treatment, assessed up to 10 years
Time to symptomatic progressive disease
Kaplan-Meier plot will be used to describe the survival distributions.
Time frame: From start of treatment, assessed up to 10 years
Time to next therapy for metastatic castration resistant prostate cancer
Kaplan-Meier plot will be used to describe the survival distributions.
Time frame: From start of treatment, assessed up to 10 years
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