holistic approach to risk assessment- is the current ...€¦ · holistic approach to human risk...
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/ Miljøstyrelsen / Titel på præsentation 1
EFSA Scientific Conference 2018
Susanne Hougaard Bennekou Senior Advisor, The Danish EPA Parma, 19th. September 2018
Holistic Approach to
Human Risk Assessment-
Is the Current Approach Fit
for Purpose?
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Tekst-typografier
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Disclaimer
2
09 October 2018
The opinions expressed in this presentation are the author's
own and do not reflect the view of the Danish EPA
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3
Holistic Approach
Current Approach Fit for Purpose? Is it good enough at what it is meant to do?
Do regulations support a holistic approach?
?
Compartmentalised?
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Tekst-typografier
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Compartments
4
09 October 2018
Single Substance Evaluation Cmpd 1 Cmpd 2 Cmpd 3
Cmpd 4 Cmpd 4 Cmpd∞
Regulatory Siloes REACH Pesticide Biocides Medicines
Geographical Countries Unions Continents
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5
Holistic Approach?
Do we need it ?
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09 October 2018 6
Transparency
&
Trust
In
Safety
Assessment
- Informed Skeptiscism
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7
Data requirement - active substance
Toxicokinetics – absorption, distribution, excretion, metabolism –single and repeated dose rat
Acute exposure - oral, dermal, inhalation rat
Irritation – eye, skin rabbit
Sensitisation mouse
Subchronic toxicity (28-90 days ) rat
Subchronic toxicity (28 days – 1 year) dog
Genotoxicity – in vitro (mutagenicity, chromosome aberrations, aneugenicity)
Genotoxicity – in vivo (chromosome aberrations – possibly others) mice
Chronic toxicity (2 year) rats
Carcinogencity (2 year) rats
Carcinogenicty mice
Teratogenicity rat
Teratogenicity rabbit
Reproduction – 1 or 2 generations rat
Neurotoxicity (acute and/or chronic exposure) rat, Developmental neurotoxicity rat
All relevant data from open litteratur (systematic review)
Others – special studies on endocrine end points
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Tekst-typografier
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Confidence in the risk assessment?
8
Active Substance
• Wide range test
• Regulate on the basis of no observed adverse effect
levels
• Reference values should cover vulnerable groups
Exposure
• Reasonable upper limits are estimated for the levels of
human exposure to the active substance
Risk Assessment
• Consumers
• Operator
• Worker
• Bystander
• Resident
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9
Confidence in the risk assessment? Yes
But how Safe
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10
Tough? • Relies heavily on non-human data • Relies on in vivo data – not designed to provide
mechanistic understanding • Multi-factorial diease etiologies not covered • Co-exposures not considered • Reference doses based on NOAELs – does not allow
quantification of the uncertainty • Deterministic reference doses – coverage and
uncertainty is not determined • Protection Goal is not well-defined
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“ENSURE
NOT ANY
HARMFUL
EFFECT”
NO ADVERSE
EFFECT LEVEL IN
RODENTS / 100
CONSERVATIVE
ESTIMATE OF
EXPOSURE
?
EFSA Guidance on
Uncertainty in Scientific
Assessment
CALIBRATE
DEFINE ASSESS
Protection
Goal
Risk Metric
Ratio of Protective Exposure Estimate to Rodent NOAEL / 100
Incidence of
adverse
health
effects in EU
Acceptable risk
Critical value
for regulation
Pesticide Reg. 107/2009
Courtesy of Andy Hart
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12
Data requirement - active substance
Toxicokinetics – absorption, distribution, excretion, metabolism –single and repeated dose rat
Acute exposure - oral, dermal, inhalation rat
Irritation – eye, skin rabbit
Sensitisation mouse
Subchronic toxicity (28-90 days ) rat
Subchronic toxicity (28 days – 1 year) dog
Genotoxicity – in vitro (mutagenicity, chromosome aberrations, aneugenicity)
Genotoxicity – in vivo (chromosome aberrations – possibly others) mice
Chronic toxicity (2 year) rats
Carcinogencity (2 year) rats
Carcinogenicty mice
Teratogenicity rat
Teratogenicity rabbit
Reproduction – 1 or 2 generations rat
Neurotoxicity (acute and/or chronic exposure) rat, Developmental neurotoxicity rat
All relevant data from open litteratur (systematic review)
Others – special studies on endocrine end points
PRESCRIPTIVE
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13
Data requirement - active substance
Toxicokinetics – absorption, distribution, excretion, metabolism –single and repeated dose rat
Acute exposure - oral, dermal, inhalation rat
Irritation – eye, skin rabbit
Sensitisation mouse
Subchronic toxicity (28-90 days ) rat
Subchronic toxicity (28 days – 1 year) dog
Genotoxicity – in vitro (mutagenicity, chromosome aberrations, aneugenicity)
Genotoxicity – in vivo (chromosome aberrations – possibly others) mice
Chronic toxicity (2 year) rats
Carcinogencity (2 year) rats
Carcinogenicty mice
Teratogenicity rat
Teratogenicity rabbit
Reproduction – 1 or 2 generations rat
Neurotoxicity (acute and/or chronic exposure) rat, Developmental neurotoxicity rat
All relevant data from open litteratur (systematic review)
Others – special studies on endocrine end points
What do we prescribe ?
Bad prescription Poor reproducibility
Difficult to interpretate
Inefficient
Expensive
Insensitive
Relevance
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Tekst-typografier
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Are there nasty surprises?
14
602 epidemiological studies - >6000 data analysis
In meta-analysis consistent increased risk
• Parkinson’s Disease
• Childhood Leukemia
• Type II diabetes
• Asthma
• Amyotrophic lateral sclerosis
• Some cancer types – liver, breast, stomach
Do not allow conclusions but still concern
What is the biological plausibility?
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15
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16
PRESCRIPTIVE ?
Strengths: We get a lot of data - FOMO
Weakness: Not always (or even necessary) relevant data
Opportunity: FODU
Challenge: Utilize new developments in science
- Fully Optimise Data Use
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17
Data requirement - active substance
Toxicokinetics – absorption, distribution, excretion, metabolism –single and repeated dose rat
Acute exposure - oral, dermal, inhalation rat
Irritation – eye, skin rabbit
Sensitisation mouse
Subchronic toxicity (28-90 days ) rat
Subchronic toxicity (28 days – 1 year) dog
Genotoxicity – in vitro (mutagenicity, chromosome aberrations, aneugenicity)
Genotoxicity – in vivo (chromosome aberrations – possibly others) mice
Chronic toxicity (2 year) rats
Carcinogencity (2 year) rats
Carcinogenicty mice
Teratogenicity rat
Teratogenicity rabbit
Reproduction – 1 or 2 generations rat
Neurotoxicity (acute and/or chronic exposure) rat, Developmental neurotoxicity rat
All relevant data from open litteratur (systematic review)
Others – special studies on endocrine end points
PRESCRIPTIVE
→
FLEXIBLE
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09 October 2018 18
FODU Endpoint
Similar toxophore
Kinetics
Genotoxicity
Repeat-dose toxicity
Carcinogenicity
Teratogenicity
Reproductive toxicity
ED activity
Neurotoxicity
DNT
Cmpd 3
+
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09 October 2018 19
+
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2018 2008 2005 2011 2013 2013 2005
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09 October 2018 20
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FODU
Read-Across
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21
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09 October 2018 / Environmental Protection Agency / Titel på præsentation 22
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09 October 2018 24
Read Across Regulation Read Across
Food Contact Materials
Feed
Flavourings
Biocides
REACH
Pesticide Regulation
Pesticide: Data Requirements
Pesticides: Identification of Endocrine Disruptors
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09 October 2018 25
Amendment to 1107/2009 on placing of Plant
Protection Products on the market - on the
identfication of ED’s
1. it shows an adverse effect in an intact organism or its progeny, which is a
change in the morphology, physiology, growth, development, reproduction or
life span of an organism, system or (sub)population that results in an
impairment of functional capacity, an impairment of the capacity to
compensate for additional stress or an increase in the susceptibility to other
influence;
2. it has an endocrine mode of action, i.e. alters the function(s) of the
endocrine system;
3. the adverse effect is a consequence of the endocrine mode of action
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Tekst-typografier
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26
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27
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09 October 2018 28
Endpoint
Acute toxicity
Kinetics
Genotoxicity
Repeat-dose toxicity
Carcinogenicity
Teratogenicity
Reproductive toxicity
ED activity
Androgen
Estrogen
Thyroid
Steroidgenesis
Neurotoxicity
DNT
Cmpd 3
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09 October 2018 29
Endpoint
Acute toxicity
Kinetics
Genotoxicity
Repeat-dose toxicity
Carcinogenicity
Teratogenicity
Reproductive toxicity
Anogenital distance
ED activity
Androgen
Estrogen
Thyroid
Steroidgenesis
Neurotoxicity
DNT
Cmpd 3
+
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↓
↓
n.a.
n.a.
n.a.
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Cmpd 1
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↓
↓
n.a.
n.a.
n.a.
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--
Cmpd 2
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↓
↓
n.a
n.a.
n.a.
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n.a.
n.a.
n.a.
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?
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Androgen receptor antagonism leads to impairment of reproductive capacity
Androgen
receptor
antagonism
Decreased
gene
transcription
Impairment of
reproductive capacity
Incomplete
development of male
organs
KER KER KER
MIE KE1 AO KE2
Adverse Outcome Pathway
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09 October 2018 31
OECD AOP Status 18th September 2018 AOP Modality Status
Aromatase Inhibition leading to reproductive
dysfunction
s Endorsed
Androgen receptor agonism leading to reproductive
dysfunction
A Approved
Aromatase (Cyp19a1) reduction leading to impaired
fertility in adult female
S Under review
Estrogen receptor antagonism leading to reproductive
dysfunction
E Under review
Inhibition of Thyroperoxidase and Subsequent
Adverse Neurodevelopmental Outcomes in Mammals
T Under review
PPARα activation in utero leading to impaired fertility
in males
other Under review
Inhibition of Na+/I- symporter (NIS) leads to learning
and memory impairment
T Under development
Open for comments
A lot under development
Very different level of matureness
Not OECD workplan
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09 October 2018 32
C&L Classification & Labelling
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09 October 2018 33
0
5
10
15
20
Malignant lymphomas in male mice
K&H 1983 Atkinson 1993 Sugimoto 1997 Wood 2009 Kumar 2001
* HCD
*
Should we care ? Courtesy of Danielle Cours Marques
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09 October 2018 / Environmental Protection Agency / Titel på præsentation 34
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09 October 2018 / Environmental Protection Agency / Titel på præsentation 35
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09 October 2018 36
1,2,4 Triazole
Toxic to reproduction
Endocrine disruptive activity?
Devlopmental neurotoxity?
Carcinogenicity?
Sources:
Cyproconazole, Difenoconazole, Metconazole, Myclobutanil, Propiconazole, Prothioconazole,
Triadimenol,Triticonazole, Epoxiconazole, Fenbuconazole, Paclobutrazol, Penconazole, Tebuconazole
Tetraconazole
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09 October 2018 37
1,2,4 Triazole
Toxic to reproduction
Endocrine disruptive activity?
Devlopmental neurotoxity?
Carcinogenicity?
Sources:
Cyproconazole, Difenoconazole, Metconazole, Myclobutanil, Propiconazole, Prothioconazole,
Triadimenol,Triticonazole, Epoxiconazole, Fenbuconazole, Paclobutrazol, Penconazole, Tebuconazole
Tetraconazole
Other sources?
De-nitrification
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09 October 2018 38
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Chemical Toxico- Kinetics
Molecular Effect
Cellular Effect
Tissue/ Organ
Organism Population
Adverse Outcome Pathway
QSAR, Modeling,Exposure & TK
In Vitro
In Vivo
Epidemiological
Biomonitering
MIE KE1 AO KE2
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Chemical Toxico- Kinetics
Molecular Effect
Cellular Effect
Tissue/ Organ
Organism Population
QSAR, Modeling,Exposure & TK
In Vitro
In Vivo
Epidemiological
Biomonitering
Inhibition of the mitochondrial complex I of nigro-
striatal neurons leads to parkinsonian motor deficits AOPwiki #3
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Holistic Wish List
• Screening
• AOPs
• Data availability
• Define Protection Goals
• Rigorous analysis of uncertainties
• Flexible data requirements
• Harmonised Approaches
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www.sapea.info/plantprotectionproducts https://ec.europa.eu/research/sam/index.cfm?pg=pesticides
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09 October 2018 43
• Efficient use of expert knowledge resources and data
• Agile in regard to incorporating new science and data into risk assessment
• Support risk management decisions and provide transparency to the public
• Address co-formulants in PPPs
• Address risk assessment for mixtures and candidates for substitution
• Integrate post-marketing data (monitoring) into risk assessment
• Support a harmonised system
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/ Miljøstyrelsen / Titel på præsentation 44
Susanne Hougaard Bennekou Senior Advisor, The Danish EPA [email protected]
Thanks