For Cause Prostate Biopsy in REDUCE Population Trial
| Status: | Completed |
|---|---|
| Conditions: | Prostate Cancer, Cancer |
| Therapuetic Areas: | Oncology |
| Healthy: | No |
| Age Range: | 50 - 75 |
| Updated: | 8/11/2016 |
| Start Date: | February 2012 |
| End Date: | February 2012 |
Determining the Likelihood of Prostate Cancer Detection in Men Taking Dutasteride When Biopsy is Performed 'for Cause'.
The REDUCE trial was conducted to determine whether dutasteride reduces the risk of incident
prostate cancer, as detected on biopsy, among men who are at increased risk for the disease.
Dutasteride was compared with placebo for 4 years period. Results showed a relative risk
reduction of 22.8 % (95% CI: 15.2 to 29.8)in prostate cancer.
For REDUCE, biopsies were defined as "protocol biopsy" if performed at certain timeframes,
and "for cause" if outside these predetermined timeframes.
The investigators propose a post hoc analysis that would allow them to include biopsies that
really justified a clinical indication, but were excluded from "for cause" analysis based on
occurring at either the 2 or 4 year timeframes.
Thus the investigators propose analysis of both REDUCE groups by every yearly timeframe as:
Group 1--dutasteride group biopsied "for cause" using several definitions: biopsy of
patients who received dutasteride whose PSA rose from nadir as defined in your own
protocol,who had a PSA rise>0.2 ng/ml or who had a new abnormal DRE or had a free PSA<12% .
The investigators define these as such because this would reasonably instigate biopsy if the
clinician had a patient with this scenario in the non-study setting.
Group 2--placebo group biopsied "for cause" using several definitions, regardless of
timeframe but reported at each year of the study and aggregate, with the aggregate number
being the primary outcome. Thus the investigators would request results of biopsy of
patients who received placebo To establish differences in biopsy positive rates the groups
as per each definition listed, to determine if dutasteride decreased the likelihood of "for
cause" biopsy compared to "not for cause" biopsy, and if there is a difference in cancer
detection risk rate depending on cause vs. no cause in that group compared to placebo.
prostate cancer, as detected on biopsy, among men who are at increased risk for the disease.
Dutasteride was compared with placebo for 4 years period. Results showed a relative risk
reduction of 22.8 % (95% CI: 15.2 to 29.8)in prostate cancer.
For REDUCE, biopsies were defined as "protocol biopsy" if performed at certain timeframes,
and "for cause" if outside these predetermined timeframes.
The investigators propose a post hoc analysis that would allow them to include biopsies that
really justified a clinical indication, but were excluded from "for cause" analysis based on
occurring at either the 2 or 4 year timeframes.
Thus the investigators propose analysis of both REDUCE groups by every yearly timeframe as:
Group 1--dutasteride group biopsied "for cause" using several definitions: biopsy of
patients who received dutasteride whose PSA rose from nadir as defined in your own
protocol,who had a PSA rise>0.2 ng/ml or who had a new abnormal DRE or had a free PSA<12% .
The investigators define these as such because this would reasonably instigate biopsy if the
clinician had a patient with this scenario in the non-study setting.
Group 2--placebo group biopsied "for cause" using several definitions, regardless of
timeframe but reported at each year of the study and aggregate, with the aggregate number
being the primary outcome. Thus the investigators would request results of biopsy of
patients who received placebo To establish differences in biopsy positive rates the groups
as per each definition listed, to determine if dutasteride decreased the likelihood of "for
cause" biopsy compared to "not for cause" biopsy, and if there is a difference in cancer
detection risk rate depending on cause vs. no cause in that group compared to placebo.
Purpose: Determining the likelihood of prostate cancer detection in men taking dutasteride
when biopsy is performed 'for cause'.
Population: The population of interest is the REDUCE Biopsied population, that is, all
subjects in the Efficacy population who have at least one post-baseline biopsy reviewed by
the Central Pathology Laboratory.
Analyses: Initial interest will be focused on data from the Year 1-2 time period, to avoid
the potential effect of the cancer diagnoses from the Year 2 scheduled biopsies on the
assessments utilized in the "for cause" definitions. Only PSA data from Years 1-2 and
baseline will be utilized in the computation of the various PSA metrics, and only Central
Pathology results from Years 1-2 will be utilized to establish post-baseline diagnoses. PSA
values on or within 42 days after date of biopsy will be excluded from the analyses, to
avoid potential effects of biopsy on the PSA value.
For each of the 2 groups of subjects, the following will be summarized: number of subjects
meeting the corresponding criteria, number and % of subjects diagnosed with prostate cancer,
number and % of such subjects diagnosed with Gleason 7-10, and number and % of subjects
diagnosed with either prostate cancer, HGPIN or ASAP. Summaries of the numbers of subjects
meeting each of the specific criteria for group 1 (a through e) and Group 2 (a through h)
will be provided.
In addition, summaries investigating the effect of baseline variables (such as age, family
history of prostate cancer, prostate volume, percent free PSA, number of cores at the entry
biopsy) on the occurrence of prostate cancer diagnoses and Gleason 7-10 diagnoses may be
developed.
when biopsy is performed 'for cause'.
Population: The population of interest is the REDUCE Biopsied population, that is, all
subjects in the Efficacy population who have at least one post-baseline biopsy reviewed by
the Central Pathology Laboratory.
Analyses: Initial interest will be focused on data from the Year 1-2 time period, to avoid
the potential effect of the cancer diagnoses from the Year 2 scheduled biopsies on the
assessments utilized in the "for cause" definitions. Only PSA data from Years 1-2 and
baseline will be utilized in the computation of the various PSA metrics, and only Central
Pathology results from Years 1-2 will be utilized to establish post-baseline diagnoses. PSA
values on or within 42 days after date of biopsy will be excluded from the analyses, to
avoid potential effects of biopsy on the PSA value.
For each of the 2 groups of subjects, the following will be summarized: number of subjects
meeting the corresponding criteria, number and % of subjects diagnosed with prostate cancer,
number and % of such subjects diagnosed with Gleason 7-10, and number and % of subjects
diagnosed with either prostate cancer, HGPIN or ASAP. Summaries of the numbers of subjects
meeting each of the specific criteria for group 1 (a through e) and Group 2 (a through h)
will be provided.
In addition, summaries investigating the effect of baseline variables (such as age, family
history of prostate cancer, prostate volume, percent free PSA, number of cores at the entry
biopsy) on the occurrence of prostate cancer diagnoses and Gleason 7-10 diagnoses may be
developed.
Inclusion Criteria:
Group 1—subjects in the dutasteride treatment group who meet the following sets of
criteria:
- A rise in PSA from nadir at any time post-nadir
- PSA change from baseline >0.2 ng/ml at any time post-baseline
- Abnormal DRE at any time post-baseline
- Free PSA<12% at any time post-baseline
- At least one of the above 4 criteria.
Group 2—subjects in the placebo treatment group who meet the following sets of criteria:
- Change from baseline PSA between 0.0 and 0.35 (ie, 0.0 ≤ change from baseline PSA <
0.35) at any time post-baseline. Note that in REDUCE PSA was recorded to the nearest
0.1.
- Abnormal DRE at any time post-baseline
- Change from baseline PSA ≥ 0.35 at any time post-baseline
- Change from baseline PSA ≥ 0.75 at any time post-baseline
- PSA ≥ 2.5 at any time post-baseline
- PSA ≥ 4.0 at any time post-baseline
- Percent Free PSA < 12% at any time post-baseline
- At least one of the above 7 criteria.
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