2. What is a D(ata)S(afety)M(onitoring)B(oard)?
A committee charged with monitoring
safety
efficacy
progress of a clinical trial
Aka
DMC, DSMC, IDMC, …
3. History
Data and Safety Monitoring
1979
Every clinical trial should have provision for
data and safety monitoring
The size of the monitoring committee
depends upon the nature, size, and complexity
of the clinical trial
The Principal Investigator was expected to
perform the monitoring function but may have
had others to help
4. 1994
It was recommended that every clinical trial,
even those that pose little likelihood of harm
have an external monitoring body
1998
Establishment of Data Safety Monitoring
Board (DSMB) is required for multi-site
clinical trials involving interventions that
entail potential risk to the participants
5. 2006
FDA guidance :
Establishment and Operation
of Clinical Trial Data Monitoring
Committees
6. Composition
Voting
•Physician(s) in specialty area (disease,
side effects)
•Epidemiologist/trial methodologist
•Statistician
•Clinical pharmacologist/safety specialist?
•Ethicist, patient representative, lawyer?
•Need effective chairman
8. Voting members
3-10 experts in disease, study drug, clinical
trials
Multidisciplinary, independent
Disinterested – no conflict of interest
Experience on other DSMBs
Chair & statistician
Some inexperienced to train them
Must take responsibilities seriously
9. Qualifications
1. Expertise in the field
2. Experience in conduct of CT & statistical
knowledge
3. Independence from direct management of
CT
4. No conflict of interest
10. Rationale for using DSMBs in
research
Ethical compact protecting trial participants
Sponsor: regulatory responsibilities
May alsoadvise about changes in protocol,
procedures
NIH often uses DSMB in an advisory capacity
– different from industry-sponsored trials
11. Trials that need a DSMB
Double-blind
Large (hundreds, thousands of subjects)
Multi-center/multi-national
Long duration
Endpoint: death or stroke or …
12. Participants have high intrinsic mortality risk
HIV infection, cancer
Sepsis, pulmonary disease, cardiac failure
Trial studying a new chemical entity
Recommended (strongly) by regulatory agency
13. Trials that DON’T need a DSMB
Phase I studies, pilot studies (some)
Studies of symptom relief
Studies with other very close safety
monitoring
Timeline so short the DSMB can’t
operate
14. Requirements for DSMB’s
NIH FDA
Typically require DSMB Risk to trial participants
• Protocols that generate • Study endpoint
blinded/randomized data • Large trials of long-
• Multicenter protocols; duration
> minimal risk Practicality
• Gene transfer protocols • Short trials
May require DSMB Assurance of scientific validity
• Protocols requiring • Inclusion of new scientific
special scrutiny knowledge without adding
High public interest bias
Vulnerable
populations
15. Purpose of DSMB
• Identify high rates of ineligibility determined after
randomization
• Identify protocol violations that suggest clarification
of changes to protocol are needed
• Identify unexpectedly high drop out rates that
threaten the trial’s ability to produce credible results
• Ensure validity of study results
16. Duties of DSMB
Review the research protocol and plans for
data and safety monitoring
Evaluate the progress of the trial with
periodic assessments of data quality and
timeliness, participant recruitment,
participant risks and benefits; Reports
from related studies
17. Make recommendations to the IRB
and investigators concerning
continuation or conclusion of the trial
Review the adverse event reports.
18. Timing of meetings
Meets annually
Periodically when
Risk to subjects is high
Vulnerable subjects
Large volume of data to review
20. Initially an open session is conducted
• members of the clinical trial may be
present
• may focus on accrual, protocol
compliance, and general toxicity issues
• no outcome results discussed during
this session
21. Followed by a closed session
• DSMB members only
• outcome results discussed
• statistical reports (if necessary)
Finally an executive session
• DSMB members only
• discuss the general conduct of the trial
• all outcomes (including toxicities and AE)
• develop recommendations and vote if
necessary
22. Contents and intent of report
Purpose –allow DSMB to make informed decisions
1. Summary of protocol and outstanding issues
2. Recruitment and follow-up
3. Baseline data
4. Check of randomization
5. Timeliness of data & adjudication of endpoints
6. Adverse events with study-specific coding
7. Dosage of study medication
8. Vital signs and laboratory parameters
9. Outcome data
23. Recommendations from the DSMB
Shared with Sponsor, Steering Committee,
IRBs
Must prevent unblinding of study team
Be careful with communications!
During the trial, everyone reads tea leaves
DSMB must keep impeccable records
What did they know and when did they
know it?
Did they change their behavior and rules in
response to data?
24. Are There Disadvantages to Having a
DSMB?
* YES!
Increases complexity of trial management
Increases costs
If the ethical imperatives discussed earlier
are not applicable, other (simpler)
monitoring approaches are usually
acceptable
25. Dechallange & Rechallange
Dechallenge -The clinical decision to withdraw drug treatment
after a possible ADR occurred
Considered to be -
+ve : if the reaction occurs at each dose & abates completely or
partially after withdrawal of drug
-ve : if the reaction does not abate after withdrawal of drug
Not applicable where :
* Drug is one dose treatment (vaccine )
* Reactions occurred after the drug was discontinued
* congenital anomaly (irreversible )
26. Rechallenge- Reintroduction of the same drug which had
been withdrawn due to ADR following +ve dechallenge
Considered to be
+ve : reoccurrance of similar signs & symptoms as that of
previous
-ve : failure of appearance of similar signs & symptoms as
that of previous one
Not applicable where
* same as that of rechallenge
for ethical reasons rechallenge is rarely performed but it
may eb carried out when the results are in the interest of
patient suffering the reaction, particularly when there
are no suitable alternative drugs