Safety and Efficacy Study of MDV3100 in Patients With Castration-Resistant Prostate Cancer Who Have Been Previously Treated With Docetaxel-based Chemotherapy (AFFIRM)
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|ClinicalTrials.gov Identifier: NCT00974311|
Recruitment Status : Completed
First Posted : September 10, 2009
Results First Posted : October 30, 2012
Last Update Posted : August 15, 2018
|Condition or disease||Intervention/treatment||Phase|
|Castration-Resistant Prostate Cancer||Drug: Enzalutamide Drug: Placebo||Phase 3|
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||1199 participants|
|Intervention Model:||Parallel Assignment|
|Masking:||Triple (Participant, Investigator, Outcomes Assessor)|
|Official Title:||Affirm: A Multinational Phase 3, Randomized, Double-blind, Placebo-controlled Efficacy And Safety Study Of Oral Mdv3100 In Patients With Progressive Castration-resistant Prostate Cancer Previously Treated With Docetaxel Based Chemotherapy|
|Actual Study Start Date :||September 30, 2009|
|Actual Primary Completion Date :||September 15, 2011|
|Actual Study Completion Date :||November 2, 2017|
MDV3100, 160 mg orally per day
|Placebo Comparator: Placebo||
- Overall Survival [ Time Frame: During study period (up to 3 years) ]Survival is defined as time from randomization to death due to any cause. The duration of overall survival was right-censored for participants who were lost to follow-up since randomization or not known to have died at the data analysis cutoff date (this included participants who were known to have died after the data analysis cutoff date).
- Radiographic Progression-free Survival [ Time Frame: During study period (up to 3 years) ]Radiographic progression-free survival was defined as time from randomization to the earliest objective evidence of radiographic progression or death due to any cause. Participants were assessed for objective disease progression at regularly scheduled visits. The consensus guidelines of the Prostate Cancer Clinical Trials Working Group 2 were taken into consideration for the determination of disease progression. Radiographic disease progression was defined by Response Evaluation Criteria in Solid Tumours (RECIST) 1.1 for soft tissue disease, or the appearance of two or more new bone lesions on bone scan. Progression at the first scheduled reassessment at Week 13 required a confirmatory scan 6 or more weeks later. Participants who did not reach the endpoint were right censored at their last assessment.
- Time to First Skeletal-related Event [ Time Frame: During study period (up to 3 years) ]The time to first skeletal-related event was defined as time from randomization to the occurrence of the first skeletal-related event. Participants were assessed for skeletal-related events at regularly scheduled visits. A skeletal-related event was defined as radiation therapy or surgery to bone, pathologic bone fracture, spinal cord compression, or change of antineoplastic therapy to treat bone pain. Participants who did not reach the endpoint were right censored at their last assessment.
- Percentage of Participants Who Were Responders for Functional Assessment of Cancer Therapy-Prostate (FACT-P) [ Time Frame: Baseline up to 3 years ]The FACT-P was a 39-item participant questionnaire which assessed physical well-being (7 items), social/family well-being (7 items), emotional well-being (6 items), functional well-being (7 items), and additional prostate cancer specific concerns (12 items). All items were scored from 0 (not at all) to 4 (very much). The sum of scores on all 5 domains constitutes the global FACT-P. The global/total FACT-P score ranged from 0 (worst) to 156 (best), higher scores indicate better health status. Responders were those participants who had a 10-point improvement in their total FACT-P score, as compared with baseline, on two consecutive measurements obtained at least 3 weeks apart.
- Time to Prostate-specific Antigen (PSA) Progression [ Time Frame: Baseline and at every study visit from week 13 while on study drug (up to 3 years) ]Time to PSA progression was defined as time from randomization to PSA progression. Participants who did not reach the endpoint were right censored at their last assessment or for participants with no post-baseline PSA assessment, date of randomization. For participants with PSA declines at Week 13, the PSA progression date was defined as the date that a >=25% increase and an absolute increase of >=2 nanogram per milliliter (ng/mL) above the nadir was documented, which was confirmed by a second consecutive value obtained 3 or more weeks later (required only if PSA progression did not occur at last PSA assessment). For participants with no PSA declines at Week 13, PSA progression date was defined as the date that a >=25% increase and an absolute increase of >=2 ng/mL above the baseline was documented, which was confirmed by a second consecutive value 3 or more weeks later (required only if PSA progression did not occur at last PSA assessment).
- Percentage of Participants With Pain Palliation [ Time Frame: Baseline up to 3 years ]The proportion of participants with pain palliation was assessed for participants with a stable and sufficient pain burden at study entry. Pain burden was measured by question #3 of the Brief Pain Inventory (Short Form). This scale measures pain on a 0 to 10 scale with 0 indicating no pain and 10 indicating pain as bad as you can imagine. Pain palliation at Week 13 was determined for the proportion of men with baseline bone metastasis(es) who had baseline pain attributable to the metastasis(es). Palliation was defined as >=30% reduction in average pain score at Week 13 compared to baseline without a >=30% increase in analgesic use.
- Percentage of Participants With Prostate Specific Antigen (PSA) Response [ Time Frame: During study period (up to 3 years) ]Participants were evaluable for PSA response rate if they had a PSA level measured at baseline and at least 1 post-baseline assessment. Both PSA responses of > 50% and > 90% were determined. PSA responses required confirmation with a subsequent assessment that was conducted at least 3 weeks later.
- Percentage of Participants With Soft-tissue Objective Response [ Time Frame: During study period (up to 3 years) ]The best overall soft tissue response as assessed using RECIST v1.1 during the study was summarized using the investigators' response assessments and also the derived response assessments by treatment group. Only participants with measurable soft tissue disease at screening were included in this analysis. Participants with measurable disease at screening are participants who had at least 1 target lesion identified per RECIST v1.1 at screening. Percentage of participants summarizes the number of participants with complete or partial objective response (%). Soft Tissue assessment based on Eisenhauer EA, Therasse P, Bogaerts J et al. New response evaluation criteria in solid tumours: Revised RECIST guideline (version 1.1). Eur J Cancer 2009; 45:228-247.
- European Quality of Life Five-Domain (EQ-5D) Scale [ Time Frame: Week 13 ]EQ-5D: participant rated questionnaire to assess health-related quality of life in terms of a single utility or index score. Five parameters (mobility, self-care, usual activities, pain/discomfort, and anxiety/depression) were assessed on 3-point categorical scale (1= no problems, 2= some/moderate problems and 3= severe problem). Score were transformed and resulted in a total EQ-5D score range of 0 (worst imaginable health state) to 100 (best imaginable health state), with higher scores indicating better health and quality of life.
- Percentage of Participants With Circulating Tumor Cell (CTC) Conversion [ Time Frame: Baseline up to 3 years ]CTC conversion was assessed for participants with baseline CTC counts of greater than or equal to (>=) 5 cells per 7.5 milliliter (mL) of blood. A CTC conversion was defined as a decline in the CTC count to less than (<) 5 cells per 7.5 mL of blood. In this outcome measure percentage of participants with CTC conversion was reported.
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Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT00974311
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|Study Director:||Pfizer Pfizer CT.gov Call Center||Pfizer|