Holistic Approach to Human Risk Assessments the Current Approach Fit for Purpose?
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1 Holistic Approach to Human Risk Assessments the Current Approach Fit for Purpose? EFSA Scientific Conference 2018 Susanne Hougaard Bennekou Senior Advisor, The Danish EPA Parma, 19th. September 2018
2 Disclaimer The opinions expressed in this presentation are the author's own and do not reflect the view of the Danish EPA 2
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? 3
4 Compartments Single Substance Evaluation Cmpd 1 Cmpd 2 Cmpd 3 Cmpd 4 Cmpd 4 Cmpd Regulatory Siloes REACH Pesticide Biocides Medicines 4 Geographical Countries Unions Continents
5 Holistic Approach? Do we need it? 5
6 Transparency & Trust Informed Skeptiscism In Safety Assessment 6
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 (2890 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) 7 Others special studies on endocrine end points
8 Confidence in the risk assessment? 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 8
9 9 Confidence in the risk assessment? Yes But how Safe
10 10 Tough? Relies heavily on nonhuman data Relies on in vivo data not designed to provide mechanistic understanding Multifactorial diease etiologies not covered Coexposures 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 welldefined
11 Protection Goal DEFINE ENSURE NOT ANY HARMFUL EFFECT? NO ADVERSE EFFECT LEVEL IN RODENTS / 100 CONSERVATIVE ESTIMATE OF EXPOSURE Risk Metric ASSESS Pesticide Reg. 107/2009 CALIBRATE Incidence of adverse health effects in EU Critical value for regulation Acceptable risk EFSA Guidance on Uncertainty in Scientific Assessment Ratio of Protective Exposure Estimate to Rodent NOAEL / 100 Courtesy of Andy Hart
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 (2890 days ) rat Subchronic toxicity (28 days 1 year) dog 12 Genotoxicity in vitro (mutagenicity, chromosome aberrations, aneugenicity) PRESCRIPTIVE 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
13 Data requirement active substance Toxicokinetics absorption, distribution, excretion, metabolism single and repeated dose rat Acute exposure oral, dermal, inhalation rat What do we prescribe? Irritation eye, skin rabbit Sensitisation mouse Subchronic toxicity (2890 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 Bad prescription Poor reproducibility Difficult to interpretate Inefficient Expensive Insensitive Neurotoxicity (acute and/or chronic exposure) rat, Developmental neurotoxicity rat All relevant data from open litteratur (systematic review) 13 Relevance Others special studies on endocrine end points
14 Are there nasty surprises? 602 epidemiological studies >6000 data analysis In metaanalysis consistent increased risk Parkinson s Disease Childhood Leukemia Type II diabetes Asthma Amyotrophic lateral sclerosis Some cancer types liver, breast, stomach 14 Do not allow conclusions but still concern What is the biological plausibility?
15 15
16 PRESCRIPTIVE? Strengths: We get a lot of data FOMO Weakness: Not always relevant data (or even necessary) Opportunity: FODU Fully Optimise Data Use Challenge: Utilize new developments in science 16
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 17 Sensitisation PRESCRIPTIVE mouse Subchronic toxicity (2890 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 FLEXIBLE 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
18 FODU Endpoint Cmpd 1 Cmpd 2 Cmpd 3 Cmpd 4 Metb. 1 Metb. 2 Metb. 2 Similar toxophore Kinetics Genotoxicity Repeatdose toxicity Carcinogenicity Teratogenicity Reproductive toxicity () ED activity () () Neurotoxicity DNT 18
19 19 () () ()
20 20 () () () FODU ReadAcross
21 21
22 22 / Environmental Protection Agency / Titel på præsentation
23 23
24 Regulation Read Across Read Across Food Contact Materials Feed Flavourings Biocides REACH Pesticide Regulation Pesticide: Data Requirements Pesticides: Identification of Endocrine Disruptors 24
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 25
26 26
27 27
28 Endpoint Cmpd 1 Cmpd 2 Cmpd 3 Acute toxicity Kinetics Genotoxicity Repeatdose toxicity Carcinogenicity Teratogenicity Reproductive toxicity ED activity Androgen Estrogen Thyroid Steroidgenesis Neurotoxicity DNT 28
29 Endpoint Cmpd 1 Cmpd 2 Cmpd 3 Cmpd 4 Acute toxicity Kinetics Genotoxicity Repeatdose toxicity Carcinogenicity Teratogenicity Reproductive toxicity Anogenital distance? ED activity Androgen Estrogen Thyroid Steroidgenesis n.a. n.a. n.a. n.a n.a. n.a. n.a. n.a. n.a. n.a. n.a. n.a. Neurotoxicity DNT 29
30 Adverse Outcome Pathway MIE KE1 KE2 AO Androgen receptor antagonism leads to impairment of reproductive capacity Androgen receptor antagonism KER Decreased KER Incomplete KER gene development of male transcription organs Impairment of reproductive capacity
31 OECD AOP Status 18th September 2018 AOP Modality Status Aromatase Inhibition leading to reproductive dysfunction Androgen receptor agonism leading to reproductive dysfunction Aromatase (Cyp19a1) reduction leading to impaired fertility in adult female Estrogen receptor antagonism leading to reproductive dysfunction Inhibition of Thyroperoxidase and Subsequent Adverse Neurodevelopmental Outcomes in Mammals PPARα activation in utero leading to impaired fertility in males Inhibition of Na/I symporter (NIS) leads to learning and memory impairment A lot under development Very different level of matureness s A S E T other T Endorsed Approved Under review Under review Under review Under review Under development Open for comments Not OECD workplan 31
32 C&L Classification & Labelling 32
33 Malignant lymphomas in male mice * * HCD K&H 1983 Atkinson 1993 Sugimoto 1997 Wood 2009 Kumar 2001 Should we care? Courtesy of Danielle Cours Marques 33
34 34 / Environmental Protection Agency / Titel på præsentation
35 35 / Environmental Protection Agency / Titel på præsentation
36 Toxic to reproduction Endocrine disruptive activity? Devlopmental neurotoxity? Carcinogenicity? 1,2,4 Triazole Sources: Cyproconazole, Difenoconazole, Metconazole, Myclobutanil, Propiconazole, Prothioconazole, Triadimenol,Triticonazole, Epoxiconazole, Fenbuconazole, Paclobutrazol, Penconazole, Tebuconazole Tetraconazole 36
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? Denitrification 37
38 38
39 Adverse Outcome Pathway MIE KE1 KE2 AO Chemical Toxico Kinetics Molecular Effect Cellular Effect Tissue/ Organ Organism Population QSAR, Modeling,Exposure & TK In Vitro In Vivo Biomonitering Epidemiological
40 Inhibition of the mitochondrial complex I of nigrostriatal neurons leads to parkinsonian motor deficits AOPwiki #3 Chemical Toxico Kinetics Molecular Effect Cellular Effect Tissue/ Organ Organism Population QSAR, Modeling,Exposure & TK In Vitro In Vivo Biomonitering Epidemiological
41 Holistic Wish List Screening AOPs Data availability Define Protection Goals Rigorous analysis of uncertainties Flexible data requirements Harmonised Approaches 41
42 =pesticides 42
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 coformulants in PPPs Address risk assessment for mixtures and candidates for substitution Integrate postmarketing data (monitoring) into risk assessment Support a harmonised system 43
44 Thanks Susanne Hougaard Bennekou Senior Advisor, The Danish EPA
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