beyond risk assessment to prec – 6/24/06 critical analysis of risk assessment & alternative...
TRANSCRIPT
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Beyond Risk Assessment to Prec – 6/24/06
Critical Analysis of Risk Assessment & Alternative Approaches
Seattle PP AcademyJune 24, 2006
Steven G. Gilbert, PhD, DABT
Getting Out of the Risk Assessment Box: Precautionary Approaches to Protect
Health
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Beyond Risk Assessment to Prec – 6/24/06
Outline
Risk Assessment – Arbitrary and Capricious
Principles of Risk Assessment Risk Assessment - examples Weaknesses of Risk Assessment Beyond Risk Assessment to
Precautionary Assessment
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Beyond Risk Assessment to Prec – 6/24/06
Key Words of Toxicology
Hazard X Exposure = Risk
Individual Susceptibility
Dose / Response
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Beyond Risk Assessment to Prec – 6/24/06
Early Risk Assessment
“What is food to one man may be fierce poison to others.”
Lucretius (c. 99 B.C.–c. 55 B.C.)
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Beyond Risk Assessment to Prec – 6/24/06
"If someone had evaluated the risk of fire right after it was invented, they may well have decided to eat their food raw."
Julian Morris of the Institute of Economic Affairs in London
Perspective
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Beyond Risk Assessment to Prec – 6/24/06
Developed in 1960-1970s Concern over increased cancer ratesExpanded to non-cancer effects
Modern Risk Assessment
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Beyond Risk Assessment to Prec – 6/24/06
Quantitative Risk Assessment
Process of estimating association between an
exposure to a chemical or physical agent and the
incidence of some adverse outcome.
National Research Council, Risk Assessment in the Federal Government: Managing the Process. National Academy Press,
Washington, DC, 1983
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Beyond Risk Assessment to Prec – 6/24/06
Steps in Risk Assessment
Hazard IdentificationExposure AssessmentDose-Response AssessmentRisk Characterization
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Beyond Risk Assessment to Prec – 6/24/06
What Hazard?
ObviousDeath, Cancer, Acid burn, Birth defect, asthma …..
SubtleDecreases in learning and memory (lead)
Loss of potential
Sensitivity of the individual (child)
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Beyond Risk Assessment to Prec – 6/24/06
Hazard Identification
Review human and animal data to determine if a chemical or agent has biological effects.
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Beyond Risk Assessment to Prec – 6/24/06
Toxicity Endpoints
Carcinogenicity Mutations Altered immune function Teratogenicity Altered reproductive function Neuro-behavioral toxicity Organ-specific effects Ecological effects (wildlife,
environmental persistence)
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Beyond Risk Assessment to Prec – 6/24/06
Exposure Assessment
Route of exposure (skin, oral, inhalation)
Amount of exposure (dose)Duration of exposureTo whom (animals, humans,
environment) Children, other sensitive individuals
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Beyond Risk Assessment to Prec – 6/24/06
• Home environment• Workplace (occupational)• School• Food• Consumer products• Global and local environment
Exposure Issues
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Beyond Risk Assessment to Prec – 6/24/06
Dose-Response Assessment
How much exposure to a chemical or agent will cause what effect?
Dose – Response
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Beyond Risk Assessment to Prec – 6/24/06
Some Jargon
LOAEL – Lowest Observed Adverse Effect Level (mg/kg)
NOAEL – No Observed Adverse Effect Level (mg/kg)
RfD – Reference Dose (mg/kg-day)
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Beyond Risk Assessment to Prec – 6/24/06
Greater Dose – Greater Response
Dose
Res
po
nse
Threshold (NOAEL)
ED50
LOAEL
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Beyond Risk Assessment to Prec – 6/24/06
Hazard (including sensitive populations)
–Low dose extrapolationExposure– Route of exposure, amount, duration• dermal, oral, inhalation, injection
– To Whom? Sensitive Individuals?
Risk Characterization
Risk = Hazard X Exposure
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Beyond Risk Assessment to Prec – 6/24/06
Doubt / Uncertainty
"Doubt is our product since it is the best means of competing with the 'body of fact' that exists in the mind of the general public.“
1969 an executive at Brown & Williamson owned by R. J. Reynolds Tobacco Company
(Doubt Is Their Product by David Michaels in Scientific American, June 15, 2005)
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Beyond Risk Assessment to Prec – 6/24/06
Uncertainty
• Measurements error in experiments• Extrapolation from animal studies to
human• Sample sizes for animal and human
studies• Selection of endpoint• Intra and inter subject variability
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Beyond Risk Assessment to Prec – 6/24/06
Human Variability
Human Subject Variability
• Lifestyle – risk of exposure to ….• Occupation – risk of exposure to ….• Breathing & digestion – uptake of chemicals• Metabolism & kidney function – elimination• Age, gender & disease – susceptibility to
toxicity• Socio/economic facts
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Beyond Risk Assessment to Prec – 6/24/06
Examples of Variability
• Children spend more time on floor – more hand to mouth behavior than adults
• Rate of breathing higher in children than adults
• Occupation – exposure to other chemicals• Lung function and susceptibility are altered
by smoking or asthma• Disease effects liver function
The overall dose-response behavior is subject to both intra-individual and inter-individual
variability.
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Beyond Risk Assessment to Prec – 6/24/06
Use of Uncertainty Factors
Divide Dose by Power of 10• Human variability• Interspecies extrapolation• Children• Subchronic to chronic extrapolation• Absence of a NOAEL• Database uncertainty
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Beyond Risk Assessment to Prec – 6/24/06
Use of Uncertainty Factors
Animal Dose Response Data
NOAEL (No Observed Adverse Effect Level) or LOAEL
Divide by 10
(Account for inadequate animal data)
Divide by 10
(Animal to Human Extrapolation)
Divide by 10
(Human Variability or Individual Sensitivity)
Reference Dose (RfD) Or Acceptable Daily Intake (ADI)
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Beyond Risk Assessment to Prec – 6/24/06Superman
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Beyond Risk Assessment to Prec – 6/24/06
Mercury & Toxicology
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Beyond Risk Assessment to Prec – 6/24/06
The Mercury Cycle
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Beyond Risk Assessment to Prec – 6/24/06
Atmospheric Hg
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Beyond Risk Assessment to Prec – 6/24/06
• Blindness - Deafness• Cerebral Palsy - Seizures• Abnormal reflexes & muscle tone• Retarded motor development• Visual and Auditory Deficits• Delayed motor development• Human and animal data
Neurobehavioral Effects
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Beyond Risk Assessment to Prec – 6/24/06
Decrease in Brain Size Cell loss Disorganization of cells Cell migration failures Behavioral effects –
learning and memory
Effects On The Brain
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Beyond Risk Assessment to Prec – 6/24/06
Fetal Effects of MeHg
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Beyond Risk Assessment to Prec – 6/24/06
MONKEY - 25 µg/kg - LOAELRAT - 10 µg/kg - LOAELRAT - 50 µg/kg - replicated
Animal - Risk Assessment
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Beyond Risk Assessment to Prec – 6/24/06
2.5 µg/kg - NOAEL (animals) 0.25 µg/kg - Human 0.025 µg/kg - Sensitive populations
Animal - Risk Assessment
(the rule of dividing by 10)
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Beyond Risk Assessment to Prec – 6/24/06
• 10-20 ppm hair - LOAEL •• 40-80 ppb blood - LOAEL •
• 0.645 µg/kg •• 0.06 µg/kg - RfD •
Human - Risk Assessment
Gilbert, S.G., and Grant-Webster, K.S. Neurobehavioral effects of developmental methylmercury exposure. Env. Health Persep. 103(Suppl 6), 135-142, 1995.
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Beyond Risk Assessment to Prec – 6/24/06
MeHg Consumption Limits
US EPA – 0.1 ug/kg-day
US FDA – 1 ppm (mg/kg) in tuna
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Beyond Risk Assessment to Prec – 6/24/06
"Lead makes the mind give way."
Ancient Awareness
GreekDioscerides - 2nd BC
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Beyond Risk Assessment to Prec – 6/24/06
Agency Blood Lead Levels
60
40
3025
2015
10
20
10
20
30
40
50
60
Blo
od
Lea
d (
ug
/dl)
CDC1960
CDC1973
CDC1975
CDC1985
WHO1986
EPA1986
CDC1990
CDC2006?
Agency and Year
Acceptable Childhood Blood Lead Levels
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Beyond Risk Assessment to Prec – 6/24/06
Recycling Lead
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Beyond Risk Assessment to Prec – 6/24/06
Limitations of Risk Assessment
Lack of adequate data Most sensitive endpoint Low dose extrapolation Exposure information Multiple chemical exposures Complex – expert driven –
undemocratic Individual sensitivity Narrow perspective – Ethical??
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Beyond Risk Assessment to Prec – 6/24/06
Community / Social Issues
Exposure Issues
Hazard / Toxicity
Precautionary Assessment
An approach to evaluating the scientific, safety, community, ethical, and social issues related to a compound or procedure.
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Beyond Risk Assessment to Prec – 6/24/06
Precautionary Assessment
Goals of PA Place the knowledge available within
the context of the community.
Incorporate the communities knowledge, values, and ethics into a more comprehensive evaluation of a hazardous condition.
Shift the burden of response.
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Beyond Risk Assessment to Prec – 6/24/06
Your comments and feedback are welcome.
Following work sheets: PA-defined: defined the elements,
questions, and scoring.
PA-worksheet: a sample worksheet that can be copied and edited with a compound of your choice.
PA-Lead: A precautionary assessment of lead.
PA-Water: A PA of water.
PA – A Work in Progress
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Beyond Risk Assessment to Prec – 6/24/06
Community / Social Issues G = Goal
N = Need
F = Future Generations
D = Democratic, community based process
A = Alternatives
Precautionary Assessment
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Beyond Risk Assessment to Prec – 6/24/06
Exposure Issues E = Exposure
M = Multiple exposures
Ch = Children exposed
CP = Consumer products
O = Occupational exposure
F = Food exposure
Precautionary Assessment
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Beyond Risk Assessment to Prec – 6/24/06
Hazard / Toxicity H = Hazard
IS = Individual Sensitivity
EC = Ecological hazard
V = Volume
P = Persistent
B = Bioaccumulate
UC = Uncertainty
Precautionary Assessment
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Beyond Risk Assessment to Prec – 6/24/06
Community / Social Issues - 12/15
Exposure Issues – 16/20
Hazard / Toxicity – 27/30
Precautionary Assessment
Lead
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Beyond Risk Assessment to Prec – 6/24/06
• We have a right to an environment in which we can reach and maintain our potential
• A matter of POLICY not Risk Assessment
Rights and Policy
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Beyond Risk Assessment to Prec – 6/24/06
The Potential of Children
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Beyond Risk Assessment to Prec – 6/24/06
Additional Information
National Research Council, Risk Assessment in the Federal Government: Managing the Process. National Academy Press, Washington, DC, 1983
World Health Organization - The International Programme on Chemical Safety (IPCS) – Risk Assessment –http://www.who.int/pcs/ra_main.html
U.S. Environmental Protection Agencies - National Center for Environmental Assessment (NCEA) – http://cfpub.epa.gov/ncea/
A Small Dose of Toxicology – Risk Assessment - http://www.asmalldoseof.org/toxicology/risk_assessment.php
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Beyond Risk Assessment to Prec – 6/24/06
Risk Assessment
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Beyond Risk Assessment to Prec – 6/24/06
• Not knowing the right questions to ask
• Most sensitive end point
• “we don’t know what we don’t know”
Fundamental Uncertainty
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Beyond Risk Assessment to Prec – 6/24/06
"All scientific work is incomplete - whether it be observational or experimental. All scientific work is liable to be upset or modified by advancing knowledge. That does not confer upon us a freedom to ignore the knowledge we already have or postpone the action that it appears to demand at a given time. "
Sir Austin Bradford Hill (1965)
Sir Austin Bradford Hill
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Beyond Risk Assessment to Prec – 6/24/06
1. Strength of association
2. Consistency of findings
3. Biological gradient
4. Temporal sequence
5. Biologic or theoretical plausibility
6. Coherence with established knowledge
7. Specificity of association
Sir Austin Bradford Hill (1965)
Determining Causation
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Beyond Risk Assessment to Prec – 6/24/06Adapted from Kraus and Slovic (1988), Risk Anal., 8: 435.
Characteristics of RiskCharacteristic Level Examples
Knowledge Little known Food additivesMuch known Alcoholic drinks
Newness Old GunsNew Space travel
Voluntariness Not voluntary CrimeVoluntary Rock climbing
Control Not controllable Natural disastersControllable Smoking
Dreadedness Little dread VaccinationGreat dread Nerve gas
Catastrophic Not likely Sunbathingpotential Likely WarEquity Distributed Skiing
Undistributed Hazardous dump
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Beyond Risk Assessment to Prec – 6/24/06
Food coloring
Saccharin
Microwave ovens
Aspirin
Anesthetics
Power Tools
Alcohol
Motor vehicles
DNA Research
Nuclear Power
Asbestos
HerbicidesPesticides
Smoking
Dynamite
Warfare
Handguns
Risk Perceptions
Catastrophic potentialInvoluntariness
Personal riskInequity
Dread
NewnessLack of scientific knowledge
Exposure is unknown/unknowable
Knowable
LeadUnknown
Known
DreadedLittle Dread