A Perspective on Risk Analysis for the GMP Initiative -...
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A Perspective on Risk Analysis for the GMP Initiative
H. Gregg Claycamp, Ph.D., CHPCenter for Veterinary MedicineOffice of New Animal Drug [email protected] 2003
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OutlineThe Premise and QuestionsBasics of Risk AnalysisPossible Stages of Risk Assessments for GMP InitiativeRisk Ranking Model for a GMP Initiative?Pilot ScaleConclusionsThe opinions and ideas presented here are those of the author and do not represent policy or opinion of the FDA. This material is intended for discussion purposes only.
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Premise: Links Among Process (GMP) Risks and Patient Risks are Lost
Proc
esse
s In
spec
tion
Ris
k
cGMP
RISK
Qua
lity
(Pat
ient
) Fa
ctor
s
Patient
Correlation?
RISK
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Goal: Re-Link cGMP Risks with Actual Risks to the Patient
RISK
Proc
esse
s In
spec
tion
Ris
k
Qua
lity
(Pat
ient
) Fa
ctor
s
cGMP Patient
RISK
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The Question…
Can Risk Management theory, tools, practice and philosophy be employed to re-link risks to the patient with the risks identified, perceived or otherwise implicated in the product quality regulatory process?
How can we share a common language about risk, risk management and science-based decision making so that we can focus on developing a high-quality risk management model for product quality?
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Getting Started…What theories, tools and lessons learned in risk analysis can help address these questions?Given the need for a significant shift in the approach to risk management, how do we begin the change process?
Are there off-the-shelf models and tools that might be used, i.e., at a pilot-scale?What kinds of RM processes can be used to foster changes needed both the regulatory and industrial spheres?
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Basic Risk Analysis
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Starting with the Some Basics
Risk is intuitive and familiar to everyone, yet few among us define risk carefully and formally enough for complex risk analysis.
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Risk = “exposure to a chance of loss” (or, Risk = “chance of losing something
we value”)
Risk = Hazard x Exposure
RiskConsequence = Hazard x Exposure
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Contemporary Risk Analysis
Includes four major activities:Hazard IdentificationRisk Assessment Risk ManagementRisk Communication
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Risk Assessment Precedes Risk Management
Risk assessment is not a single process, but “a systematic approach to organizing and analysingscientific knowledge and information.” NRC (1994)
Various paradigms exist for the execution of a risk assessment in public health; however, all paradigms have in common fundamental principles.
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Risk Assessment Asks:
What can go wrong?
What is the likelihood it would go wrong?
What are the consequences?
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Risk Management Asks:
What can be done?
What options are available?
What are risk trade-offs in terms of risks, benefits and costs?
What are the impacts of current management decisions on future options?
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Risk Analysis in a DemocracyRisk assessments provide the “facts” for risk analysis.
Risk Assessment
Risk
Risk
Risk
Risk
Risk
RiskRiskRisk
Risk
Risk
Risk
Wor
st
Risk
RiskRisk
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Risk Analysis in a Democracy
The risk management decisions about which risks to manage are value-laden decisions.
Risk Management
Risk
Risk
Risk
Risk
RiskRisk
Risk
Risk
Risk
Risk
Risk
Risk
RiskRisk
Values
Costs
Wor
st
Risk M
anagement
Rank
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Translating Risk Analytic Paradigms
Risk Analysis
Risk Assessment• Release Assessment• Exposure Assessment• Consequence Assessment• Risk Estimation
Hazard Identification
• What can go wrong?• What are the consequences? • What is the likelihood that it would go wrong?
• What can go wrong?• What are the consequences? • What is the likelihood that it would go wrong?
• What can be done?• What are the trade-offs in terms of costs, benefits and risks? • What is the impact of decisions on future RM options?
• What can be done?• What are the trade-offs in terms of costs, benefits and risks? • What is the impact of decisions on future RM options?
Risk Assessment• GMP Failures• Exposure Assessment• Consequence Assessment• Risk Estimation
A simple change to apply a
contemporary model.A simple change to apply a
contemporary model.
Risk Analysis
Risk Management
Risk Communication
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Possible Stages of Risk Assessment for the GMP Initiative
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Hazard IdentificationWhat can go wrong?
Identify hazards: eventsIdentify hazardous agents (chemical, biological, physical)
How severe are the potential consequences?Given the event occurs, is the consequence catastrophic? Mildly annoying?
How likely are the events to occur?Essentially a crude risk estimate for initial prioritization purposes.
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Exposure AssessmentRelease Assessment: How “much” of the hazardous event occurs?
Example: Does a “non-sterile” event involve 1 or 10,000 vials?
Pathway analysis: If the hazardous event occurs, what pathways are there that expose humans to the hazard?
Extent of exposure: If a hazardous event occurs, how many people are potentially exposed?
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GMP Failure (Release) Assessment
How frequent are the identified GMP events (hazards)?
Boundary of release? Process line, plant, warehouse, distributor?
Release rates (“GMP Faults”) are obtained in fault tree assessments, empirically, historical data, expert analyses.
Example: FMEA
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Consequence Assessment*Given exposure to the hazardous event/agent, what is the likelihood of harm under a pre-defined endpoint?
Endpoint examples:DeathIllnessWorryOAI
*A.K.A. “Dose-Response Assessment” (see next slide)
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Consequence Assessment
Quantity of contamination (“non-sterility”) i.e., in “bacteria counts per vial”
Prop
ortio
n of
exp
osed
pe
rson
s w
ho b
ecom
e ill
100%
50%
0% ED50
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Qualitative Consequence Assessment
Medium
Low
Rel
ativ
e Ef
fect
/Im
pact
Quantitativerelationships known
in few cases
Low(Exposure or Dose Metric)
High
HighMedium
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Risk EstimationBring together the information about
the hazard, the extent of exposure to the hazard,the consequences of exposures, and thenestimate the risk.
Includes a critical analysis of uncertainty in both the data and risk assessment models.
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Uncertainties in Risk Assessment
Knowledge Variability•Temporal
•Spatial
•Inter-individual
•Data
•Parameters
•Model
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Conceptual Models for RM in GMP Initiative
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The cGMP Risk Management Problem
Diverse GMP failure (hazards) are identified.
Wide-ranging risk (= chance that exposure to the hazard will result in harm [adverse outcome]).
Wide-ranging consequences (death to worry).
Quantitative risk analysis hazard-by-hazard too vast an undertaking.
Ranking of risks for re-linking worst GMP risks with worst health risks, etc.
How can we objectively rank “apples and oranges” among the
“potatoes and beans?”
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No electricity
Power Plant Fails
Power Line Fails
Glass Broken
Filament Broken
Connector Corroded
Vacuum Leak
Tree Breaks Line
Wind Breaks Line
Impurities Vibrations
Bulb FailsFault Trees for each process?
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Faults Magnified N-fold for a Simple Manufacturing Process
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Decision Analyses for Each Hazard Multiplies Complexity!
e.g.,
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Solution? A Multifactor Approach to GMP Risk Management
Multifactor methods already exist.
Some tools (software) already developed.
Appropriately-scaled approach to
the question,
the data quality,
the nature of the decision, and
the understanding of the overall process.
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State the AssumptionsE.g., assume that health risks were linked to GMP “compliance risks” previously, i.e., the historical basis of regulation.
Historically based assumption:↑compliance ↓Health risk
↑qualityGiven the assumption, can GMP “compliance risk” be modeled as a surrogate of health risk?
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Identify the GMP Failures (Hazards)What can go wrong?Top level organization of hazards:
Health | Compliance | Resources | Sociopolitical Second level (detail) organization:
Sterility (microbial contamination)Dose (formulation) Toxicity (chemical contamination) Physical hazards (physical contamination/defect)
Fine detail: “risk factor” event descriptors.
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Sort the Hazards/Risks by Major Categories
Start with assumptions.State questions to be answered.Sort under the questions.Re-sort if new patterns emerge.
For example, (next slide)…
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Organizing a Multi-factorial Risk Model
Risk
Health Compliance Resource
Death
Chronic Illness
Acute Illness
Mental Health
VAI
OAI
Human
Inspection $
Socio-Political
Public
Industry
The Hill
…
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Risk
Health Compliance
Death
Chronic Illness
Acute Illness
Mental Health
VAI
OAI
Focused Multi-factorial Risk Model
Example health risk endpoints
Example compliance risk endpoints
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Risk factors for a given endpoint…
Health
Death
Sterility
Lyophilization
Final Sterility
etc. …
Compliance
OAI
Sterility
Lyophilization
Final Sterility
etc. …… …
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Estimate the Prevalence
The prevalence of inspection findings for a given type of event are initial estimates of probabilities necessary for risk management modeling.Failure analysis “in plant.” Failure in compliance inspections. Human adverse events.
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For each hazard…
Probability of Occurrence
MediumMediumLowLowLowWorry
HighMediumMediumLowLowAcute Illness
HighHighMediumMediumLowChronic Illness
HighHighHighMediumMediumDeath
Very HighHighMediumLow
Very Low
Health
Endpoint
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The modeler’s view… (for example)
Probability of Occurrence
45678Worry
34567Acute Illness
23456Chronic Illness
12345Death
Very HighHighMediumLow
Very Low
Health
Endpoint
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For each hazard…
Prior History of Actions
HighMediumLowLowLowOther?
HighHighMediumLowLowVAI
HighHighHighMediumMediumOAI
Many Viol.
Some Viol.
Average Viol.
Few Viol.
Never Violations
Compliance
Endpoint
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Scoring, then prioritize multiple hazards
Probability of Occurrence
Medium
Medium
LowLowLowWorry
High
Medium
MediumLowLo
wAcute Illness
High
High
Medium
Medium
Low
Chronic Illness
High
HighHighMed
ium
Medium
Death
Very
High
High
MediumLow
Very Low
Endpoint
Probability of Occurrence
Medium
Medium
LowLowLowWorry
High
Medium
MediumLowLo
wAcute Illness
High
High
Medium
Medium
Low
Chronic Illness
High
HighHighMed
ium
Medium
Death
Very
High
High
MediumLow
Very Low
Endpoint
Probability of Occurrence
Medium
Medium
LowLowLowWorry
High
Medium
MediumLowLo
wAcute Illness
High
High
Medium
Medium
Low
Chronic Illness
High
HighHighMed
ium
Medium
Death
Very
High
High
MediumLow
Very Low
Endpoint
Probability of Occurrence
Medium
Medium
LowLowLowWorry
High
Medium
MediumLowLo
wAcute Illness
High
High
Medium
Medium
Low
Chronic Illness
High
HighHighMed
ium
Medium
Death
Very
High
High
MediumLow
Very Low
Endpoint
Scored and Prioritized 1. GMP Fault A
2. GMP Fault T
3. GMP Fault C
4. GMP Fault D
5. GMP Fault X
6. GMP Fault M
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Risk Ranking & Filtering ModelCompliance
1. GMP Fault M
2. GMP Fault T
3. GMP Fault C
4. GMP Fault D
5. GMP Fault X
6. GMP Fault A
Scored and Prioritized Under Multiple Criteria
(Risk Ranking and Filtering)
Health
Other…
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Risk Analysis Cycle
Multi-Factorial Risk Model
Risk Ranking and Filtering
Risk Ranking and Filtering
Work Planning
cGMP/Compliance Inspections
Assessments (Data Bases)
Risk ManagementRisk Assessment
Start
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Pilot Scale?
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Example Approach to Build RRF List*
Risk EstimatorRespondents x GMP Faults Database
Analysis
- Risk Managers - GMP Experts - Sr. Managers - Industry
Risk RankingRisk Ranking
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Fold into cGMP Model
Risk Ranking Risk Ranking (Table) (Table)
Risk Management “Cut-Off”
Bes
t
Wor
st
• Budget
• Risk Tolerance
• Benefit-Costs
• Stake holders
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ConclusionsRisk Assessment provides a process for organizing information in support of risk-based decision making.Risk assessment is one of the tools available for Risk Management, the activity in which the options for controlling risks are examined in light of costs, benefits and risk trade-offs. Multifactor Risk Ranking and filtering approach might be robust enough to employ in the GMP Initiative.