CNPR Clinical Trials 5 — Questions and Answers
Question 1: What is an 'open-label' clinical trial?
- A trial where participant enrollment is open to the public without restrictions
- A trial where both participants and investigators know which treatment is being administered (Correct answer)
- A trial with no control group and a single treatment arm
- A trial that publishes all results in real time
Correct answer: A trial where both participants and investigators know which treatment is being administered
In an open-label trial, both the participant and the investigator are aware of which treatment is being given, in contrast to blinded designs.
Question 2: What is the primary goal of an adaptive clinical trial design?
- To adapt the trial to a new therapeutic area mid-study
- To allow pre-specified modifications to trial elements based on accumulating data (Correct answer)
- To ensure all participants adapt to the investigational drug before analysis
- To change the primary endpoint after unblinding preliminary results
Correct answer: To allow pre-specified modifications to trial elements based on accumulating data
Adaptive designs allow pre-specified modifications (e.g., sample size re-estimation, dose selection) based on interim data while preserving statistical integrity.
Question 3: Which document formally defines the objectives, design, methodology, and statistical considerations of a clinical trial?
- Investigator brochure
- Clinical study protocol (Correct answer)
- Informed consent form
- New Drug Application
Correct answer: Clinical study protocol
The clinical study protocol is the master document that defines all aspects of trial conduct including objectives, design, eligibility criteria, endpoints, and statistical methods.
Question 4: What is 'statistical power' in the context of clinical trial design?
- The computational resources required to analyze trial data
- The probability of detecting a true treatment effect when one exists (Correct answer)
- The strength of the drug's pharmacological effect
- The number of statistical tests performed on the data
Correct answer: The probability of detecting a true treatment effect when one exists
Statistical power is the probability of correctly rejecting the null hypothesis (detecting a true effect), commonly set at 80% or 90% in trial design.
Question 5: What is the Expanded Access (compassionate use) program?
- A program to expand trial enrollment at additional sites
- A pathway allowing seriously ill patients to access investigational drugs outside of clinical trials (Correct answer)
- An FDA program to fast-track drug approvals for common diseases
- A mechanism for insurance companies to cover experimental treatments
Correct answer: A pathway allowing seriously ill patients to access investigational drugs outside of clinical trials
Expanded Access allows patients with serious or immediately life-threatening conditions to access investigational drugs outside of clinical trials when no comparable alternatives exist.
Question 6: In a clinical trial, what is a 'protocol deviation'?
- A change in the trial protocol approved by the IRB
- Any unplanned divergence from the approved study protocol (Correct answer)
- A participant's decision to withdraw from the trial
- A statistical adjustment made at the time of analysis
Correct answer: Any unplanned divergence from the approved study protocol
A protocol deviation is any unplanned departure from the approved study protocol that may or may not affect participant safety or data integrity.
Question 7: Which principle from the Belmont Report establishes that researchers must maximize benefits and minimize harms to trial participants?
- Respect for persons
- Justice
- Beneficence (Correct answer)
- Autonomy
Correct answer: Beneficence
Beneficence, one of the three Belmont principles, requires researchers to maximize possible benefits and minimize potential harms to research participants.
CNPR Clinical Trials 5
What is an 'open-label' clinical trial?