By Lisa M. Campbell and Jane S. Vergnes, Ph.D.
On June 19, 2015, the U.S. Environmental Protection Agency (EPA) announced a plan for incorporating validated high throughput assays and a computational model into the Endocrine Disruptor Screening Program (EDSP) to screen chemicals for their ability to interact with the endocrine system. These proposed new methods would serve as an alternative for three of the eleven current assays in the EDSP Tier 1 screening battery, specifically the estrogen receptor binding (ER), estrogen receptor transactivation (ERTA), and uterotrophic assays.
These computational high-throughput (HTP) tools will have the potential to impact significantly the prioritization for testing and will have a significant impact on List 2 test orders. EPA states that use of these alternative methods will accelerate the pace of screening, decrease costs, and reduce animal testing. In addition, this approach advances the goal of providing sensitive, specific, quantitative, and efficient screening using alternative test methods to some assays in the Tier 1 battery to protect human health and the environment. EPA has stated its commitment to the development of HTP and computational tools to improve regulatory science, as recommended in the 2007 National Research Council report, “Toxicity Testing in the 21st Century: A Vision and a Strategy,” and to meet its statutory obligations in the face of challenging budget constraints.
Comments are due by August 18, 2015. EPA specifically seeks comment on the following issues, which are related to its stated intention to use the scientific tools discussed as alternatives to some of the current EDSP Tier 1 screening assays:
- The use of the ToxCastTM “ER Model” for bioactivity as an alternative method for the current ER binding and ERTA Tier 1 screening assays.
- The use of the ToxCastTM “ER Model” for bioactivity as an alternative method for the current uterotrophic Tier 1 screening assay.
- The use of results from the ToxCastTM “ER Model” for bioactivity on over 1800 chemicals as partial screening for the estrogen receptor pathway.
EPA concludes that the ToxCastTM “ER Model” meets the criteria for use as “other scientifically relevant information” to satisfy Tier 1 for the ER, ERTA, and uterotrophic assays. EPA’s conclusion is based upon the findings of the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Scientific Advisory Panel (SAP) peer review held in December, 2014 that endorsed the ToxCastTM “ER Model” as a replacement for the ER and ERTA assays, and additional data developed by EPA to address the SAP’s concerns regarding the uterotrophic assay. Recipients of EDSP Tier 1 test orders would have three options for addressing the Tier 1 requirements with respect to the three EDSP Tier 1 endpoints that EPA considers validated:
- Cite existing ToxCastTM “ER Model” data, if it is applicable.
- Generate new data using the 18 ER HTP assays and the ToxCastTM “ER Model.”
- Generate Tier 1 data using the validated methods for the ER, ERTA, and uterotrophic endpoints in the traditional EDSP Tier 1.
EPA is careful to note that activity in the ToxCastTM “ER Model” is not a determination that a chemical causes endocrine disruption, only that is has the potential to do so, and that further testing (Tier 2) would be needed to make a determination regarding the ability to cause “adverse effects in an intact organism or its progeny, or subpopulations,” as stated in the World Health Organization International Programme on Chemical Safety definition.
More detailed information on the Endocrine Disruptor Screening Program and its use of computational tools is available at: http://www.epa.gov/endo/ or http://www.epa.gov/endo/pubs/pivot.htm.
By Lisa M. Campbell and James V. Aidala
The U.S. Environmental Protection Agency’s (EPA) Proposal to Mitigate Exposure to Bees from Acutely Toxic Pesticide Products published in the Federal Register on May 29, 2015, seeks comment on a proposal to adopt mandatory pesticide label restrictions to protect managed bees under contract pollination services from foliar application of pesticides that are acutely toxic to bees on a contact exposure basis, unless the application is made in accordance with a government-declared public health response. These label restrictions would prohibit applications of pesticide products that EPA has identified as acutely toxic to bees, during bloom when bees are known to be present under contract.
As part of this mitigation proposal, the 48-hour notification exception for crops under contracted pollination services during bloom for all neonicotinoid product labels would be removed. These restrictions are intended to reduce the likelihood of acute exposure and mortality to managed bees under contract. EPA is not proposing at this time to require new language for pesticide labels for managed bees not under contract pollination services. This does not, however, alter EPA’s previous actions intended to impose more specific restrictions on neonicotinoid pesticides through label language addressing potential risks to bees not under contract for pollination services.
EPA is also seeking comment on a proposal to rely on efforts made by states and tribes to reduce pesticide exposures for application sites not under contracted services, through development of locally-based measures, specifically through managed pollinator protection plans. These plans would include local and customizable mitigation measures to address certain scenarios that can result in exposure to pollinators. EPA intends to monitor the success of these plans in deciding whether further label restrictions are warranted.
EPA states that if it receives evidence during the public comment period, and/or through outreach at stakeholder meetings, that the contract provisions that are the subject of the proposed rule commonly considered effective and mutually agreed upon stakeholder practices (i.e., beekeeper-to-grower) indicating that the application of acutely toxic pesticides is not of risk concern for bees under contract, then EPA will consider this information in determining whether this scenario needs the mitigation indicated in the proposed language.
EPA states that the proposed actions are consistent with the Presidential Memorandum issued in June 2014 to reduce the effect of factors that have been associated with pollinator declines in general, as well as the mandate to engage state and tribal partners in the development of pollinator protection plans. Comments on the proposal are due by June 29, 2015.
The main elements of EPA’s pesticide regulatory strategies and policies were only a small part of the response to the President last week on a National Strategy for pollinators, but now that EPA has issued this proposal, attention will turn to what EPA is more precisely planning to do with regard to proposing and implementing new restrictions on pesticides generally and/or neonicotinoid products in particular.
As expected, the focus of the proposal is on new restrictions for acutely toxic pesticide applications (defined in the notice as “pesticides with an acutely lethal dose to 50% of the bees tested of less than 11 micrograms per bee”), where the pesticide application site is also where there are contracted pollination services. Essentially, foliar application of pesticides acutely toxic to bees are prohibited where there are bee colonies present pursuant to a contract to provide pollination services. EPA’s proposal (at Appendix A) includes a long list of pesticides (over 75) that meet the acute toxicity criteria that will be subject to the new restrictions. This list includes many more pesticides than just the neonicotinoid products.
In addition, for managed bees not under contracted services, or for other “unmanaged” bees, EPA’s reliance on state “Managed Pollinator Protection Plans” (MP3s) is consistent with public statements that EPA officials and line staff have made in recent months, so there appears to be few surprises in the proposal at first glance. Some states already have plans; many are under development. EPA has worked closely with state pesticide regulatory officials on development of state plans, and signaled that it expects state plans to incorporate three core ideas: public participation in developing the plan; some kind of notification scheme to alert beekeepers of insecticide applications; and a way to evaluate whether the state plan is effective in reducing insecticide exposure to bees.
Even so, what may generate the most public comment about EPA’s proposal is what it does NOT do; for example:
- The proposal does not impose a ban on neonicotinoid pesticides as some advocacy groups have sought;
- The proposal does not require EPA approval of state management plans (MP3s);
- The proposal does suggest options for registrants to seek product-specific exemptions to what is mandated; in other words, it again seeks to impose EPA regulatory actions “by letter” using a “one size fits all” approach; and
- The proposal does not offer significantly new restrictions regarding pollinators generally, but maintains a focus on contracted honeybees and commercial pollination services.
As the proposal has just been issued, stakeholders will now review the content to look for “the devil in the details” -- and develop comments to submit during the 30-day comment period EPA offers. (It would not be surprising if the comment period on such a high profile proposal is extended.)
More information concerning the Presidential Memorandum and the national strategy are available in Bergeson & Campbell, P.C.’s (B&C®) blog post on Pollinator Health Task Force Issues National Strategy to Promote the Health of Honey Bees and Other Pollinators.
By Lisa M. Campbell and Lisa R. Burchi
On Thursday, April 30, 2015, the U.S. Environmental Protection Agency (EPA) issued interim guidance that it intends to clarify its toxicology data requirements for antimicrobial pesticides used on food contact surfaces. In addition, EPA issued a letter to antimicrobial registrants that EPA states is intended “to summarize how the Agency has been implementing 158W with respect to existing registered antimicrobial pesticides, as well as new and pending antimicrobial pesticide applications.”
The interim guidance is intended to satisfy a condition of the March 2, 2015, settlement agreement between EPA and the American Chemistry Council (ACC), which followed ACC’s July 2013 initiation of a legal challenge to the antimicrobial data requirements (subpart 158W of Title 40 of the Code of Federal Regulations) in the U.S. Court of Appeals in the District of Columbia. The settlement agreement is discussed here.
In the settlement, EPA agreed to issue, within 60 days of the Agreement becoming final, an interim guidance document explaining EPA’s interpretation of the 200 parts per billion (ppb) residue level above which additional toxicology testing would be required for indirect food uses.
The interim guidance states with regard to the 200 ppb standard:
No later than September 2, 2017, the Agency will propose a correction to 40 CFR Part 158W to make the rule’s language as it pertains to the 200 ppb level established in 40 C.F.R. § 158.2230(d) consistent with the U.S. Food and Drug Administration’s use of that same level. The proposal will be to clarify that the 200 ppb level established in the rule is based on total estimated daily dietary intake, and is not based on the amount of residue present on only a single commodity. The Agency is providing this interim guidance to registrants that the referenced 200 ppb level is based on total estimated daily dietary intake rather than on the amount of residue present on only a single commodity.
EPA states that this interpretation is consistent with the U.S. Food and Drug Administration’s (FDA) policy. In general, if pesticide residues in food resulting from use on food contact surfaces are 200 ppb or less, EPA requires certain toxicology data. If residues are greater than 200 ppb, additional data may be required, depending on other conditions such as test results.
Also in the settlement, EPA agreed to propose, within four months of the Agreement becoming final, a guidance document entitled Antimicrobial Pesticide Use Site Index (USI), and provide a 30-day comment period. The USI guidance will provide descriptions of direct food uses, indirect foods uses, and nonfood uses. The letter states the following regarding its development of the USI guidance:
The Agency is developing a guidance document called the Antimicrobial Pesticide Use Site Index (USI) that will serve as a compilation of existing use sites and will identify how each use site fits within the twelve use patterns established in 158W. The guidance document will serve to assist prospective registrants with the application requirements by making it easier for them to identify which data are necessary to register their product(s).
EPA’s letter also discusses the following regarding existing and pending antimicrobial pesticide applications:
- EPA may find it necessary, “in the context of, but not limited to, the requirements in 158W,” to call in data as each active ingredient is evaluated under the Registration Review program. EPA does not intend to conduct this generic evaluation for new products or applications to amend existing products that are covered in Pesticide Registration Improvement Extension Act (PRIA3) fee category Table 9 -- Antimicrobial Division -- New Products and Amendments.
- During early implementation of the 158W requirements, EPA recognizes that not all new applications will have all the newly-required data. EPA may thus find it appropriate to issue Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Section 3(c)(7) conditional registrations and set a deadline for the submission of the required data.
- Any application submitted after July 8, 2013 (the effective date of the 158W requirements) must contain the required data or an adequate justification for any data requirements not submitted. On the issue of timing, applicants should explain why any data are not yet submitted and when the data can be submitted. Failure to submit required data or provide an adequate justification will result in EPA rejecting the application as incomplete under the 45/90 day preliminary technical screen under the Pesticide Registration Improvement Act (PRIA).
The settlement agreement and additional documents are available at http://www2.epa.gov/pesticide-registration/epa-data-requirements-registration-antimicrobial-pesticides-part-158w#interim and www.regulations.gov in docket EPA-HQ-OPP-2008-0110. More information on antimicrobial policies and guidance is available here.
By Lynn L. Bergeson, James V. Aidala, and Lisa R. Burchi
On March 20, 2015, the United Nations World Health Organization’s International Agency for Research on Cancer (IARC) announced it had completed evaluations assessing the carcinogenicity of five organophosphate pesticides. Specifically, IARC classified the herbicide glyphosate and the insecticides malathion and diazinon as probably carcinogenic to humans (Group 2A), and classified the insecticides tetrachlorvinphos and parathion as possibly carcinogenic to humans (Group 2B). IARC also found there is “limited evidence” that glyphosate can cause non-Hodgkin’s lymphoma and lung cancer in humans.
A summary of the final evaluations, together with a brief rationale, is published online in The Lancet Oncology; the detailed assessments will be published as Volume 112 of the IARC Monographs. IARC’s press release announcing its evaluation is available at http://www.iarc.fr/en/media-centre/iarcnews/pdf/MonographVolume112.pdf.
Monsanto, on behalf of glyphosate task forces in the U.S. and the European Union (EU), immediately voiced its vigorous disagreement with IARC’s conclusions, noting various scientific issues with IARC’s evaluation that resulted in a conclusion that has not been reached following review by the U.S. Environmental Protection Agency (EPA) and in the EU. Monsanto’s statement is available at http://news.monsanto.com/news/monsanto-disagrees-iarc-classification-glyphosate.
The IARC announcement with regard to glyphosate will further energize both sides of the debate about genetically modified organism (GMO) crops, since there are several crops that have been genetically engineered to be resistant to glyphosate. If some occupational risks are identified as needing possible further mitigation, the distinction between food safety issues and occupational risks may be lost in the rhetoric. Opponents of GMO crops and those who support GMO food product labels can be expected to cite the IARC designation regardless of any further clarification or nuance that the scientific debate over the data might provide. Defenders of the technology will insist that not only is the IARC designation wrong and misleading, but it is clearly at odds with numerous other conclusions reached by multiple competent governmental authorities concerning the safety of using glyphosate and especially consuming GMO crops.
Regardless of Monsanto’s rapid and detailed response, “dueling science” views are not helpful towards enhancing public confidence in the safety of the food supply, which is ultimately where this headline will be most influential. That will only add pressure on the review process and conclusions contained in the expected EPA registration review of glyphosate data scheduled for completion in 2015.
By Lynn L. Bergeson and Lara A. Hall, M.S., RQAP-GLP
On January 9, 2015, the U.S. Environmental Protection Agency’s (EPA) Office of Pesticide Programs (OPP) announced that it released a new draft guidance document in its effort to help expand the acceptance of alternative methods for acute toxicity testing. EPA states that the rapid advances in science and continual development of new technologies, it recognizes there is an increasing potential for the use of alternative methods in regulatory risk assessments.
EPA’s goals for alternative testing approaches include:
* Assessing a broader range and potentially more human-relevant adverse effects;
* Generating and reviewing data more quickly and less expensively; and
* Reducing use of laboratory animals in regulatory testing.
The draft guidance, Process for Establishing & Implementing Alternative Approaches to Traditional In Vivo Acute Toxicity Studies, describes the process for evaluating and implementing alternative methods of testing for acute oral, dermal, and inhalation toxicity, along with skin and eye irritation and skin sensitization. Additionally, there is a discussion of the three major phases of the process, and the implications for reporting information under Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) Section 6(a)(2). Successfully putting this process into place will require an open dialogue with stakeholders, other regulatory organizations, and the scientific community.
This draft guidance is one step in the application of OPP’s strategic vision for implementing the 2007 National Research Council report on Toxicity Testing in the 21st Century.