Update on the Status of the Superfund Substance-Specific Applied Research Program

Federal RegisterJan 31, 2002

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DEPARTMENT OF HEALTH AND HUMAN SERVICES

Agency for Toxic Substances and Disease Registry

[ATSDR-178]

Update on the Status of the Superfund Substance-Specific Applied Research Program

AGENCY:

Agency for Toxic Substances and Disease Registry (ATSDR), Department of Health and Human Services (HHS).

ACTION:

Notice.

SUMMARY:

This Notice provides the status of ATSDR's Superfund-mandated Substance-Specific Applied Research Program (SSARP) which was last updated in a

Federal Register

notice in 1999 (64 FR 2760). Authorized by the Comprehensive Environmental Response, Compensation, and Liability Act of 1980 (CERCLA, also known as the Superfund statute), as amended by the Superfund Amendments and Reauthorization Act of 1986 (SARA) 42 U.S.C. 9604 (i), this research program was initiated on October 17, 1991. At that time, a list of priority data needs for 38 priority hazardous substances frequently found at waste sites was announced in the

Federal Register

(56 FR 52178). The list was subsequently revised based on public comments and published in final form on November 16, 1992 (57 FR 54150).

The 38 substances, each of which is found on ATSDR's Priority List of Hazardous Substances (66 FR 54014, October 25, 2001), are aldrin/dieldrin, arsenic, benzene, beryllium, cadmium, carbon tetrachloride, chloroethane, chloroform, chromium, cyanide, p,p′-DDT,DDE,DDD, di(2-ethylhexyl) phthalate, lead, mercury, methylene chloride, nickel, polychlorinated biphenyl compounds (PCBs), polycyclic aromatic hydrocarbons (PAHs—includes 15 substances), selenium, tetrachloroethylene, toluene, trichloroethylene, vinyl chloride, and zinc.

On July 30, 1997, priority data needs for 12 additional hazardous substances frequently found at waste sites were determined and announced in the

Federal Register

(62 FR 40820). The 12 substances, each of which is included in ATSDR's Priority List of Hazardous Substances, are chlordane, 1,2-dibromo-3-chloropropane, di-n-butyl phthalate, disulfoton, endrin (includes endrin aldehyde), endosulfan (alpha-, beta-, and endosulfan sulfate), heptachlor (includes heptachlor epoxide), hexachlorobutadiene, hexachlorocyclohexane (alpha-, beta-, delta- and gamma-), manganese, methoxychlor, and toxaphene.

Recently, priority data needs for 10 additional hazardous substances frequently found at waste sites were determined and announced in the

Federal Register

(66 FR 42659). The 10 substances, each of which is included in ATSDR's Priority List of Hazardous Substances, are asbestos, benzidine, chlorinated dibenzo-p-dioxins, 1,2-dibromoethane, 1,2-dichloroethane, 1,1-dichloroethane, ethylbenzene, pentachlorophenol, 1,1,2,2-tetrachloroethane, and total xylenes. ATSDR invited the public to comment on the priority data needs for these substances during a period of 90 days. ATSDR is responding to the comments, and a final list of priority data needs will be published in the

Federal Register

in the near future.

To date, 190 priority data needs have been identified for the first 50 hazardous substances (Table 1). ATSDR fills these data needs through U.S. Environmental Protection Agency (EPA) regulatory mechanisms (test rules), private-sector voluntarism, and the direct use of CERCLA funds. Additional data needs are being addressed through collaboration with the National Toxicology Program (NTP), by ATSDR's Great Lakes Human Health Effects Research Program, and other agency programs. Currently, 101 priority data needs associated with the first 50 substances are being addressed via these mechanisms, and 62 priority data needs have been filled. Priority data needs documents describing ATSDR's rationale for prioritizing research needs for each substance are available. See

ADDRESSES

section of this Notice.

This Notice also serves as a continuous call for voluntary research proposals. Private-sector organizations may volunteer to conduct research to address specific priority data needs identified in this Notice by indicating their interest through submission of a letter of intent to ATSDR (see

ADDRESSES

section of this Notice). A Tri-Agency Superfund Applied Research Committee (TASARC) composed of scientists from ATSDR, NTP, and the EPA, will review all proposed voluntary research efforts.

DATES:

ATSDR provides updates on the status of its Substance-Specific Applied Research Program approximately every 3 years. ATSDR considers the voluntary research effort to be important to the continuing implementation of the SSARP. Therefore, the agency strongly encourages private-sector organizations to volunteer at any time to conduct research to fill data needs until ATSDR announces that other research mechanisms are in place to address those specific data needs.

ADDRESSES:

Private-sector organizations interested in volunteering to conduct research can write to Dr. William Cibulas, Chief, Research Implementation Branch, Division of Toxicology, ATSDR, 1600 Clifton Road, NE., Mailstop E-29, Atlanta, Georgia 30333, e-mail: wcibulas@cdc.gov. Information about pertinent ongoing or completed research that may fill priority data needs cited in this Notice should be similarly addressed.

Other Requirements:

Projects that involve the collection of information from 10 or more individuals and funded by cooperative agreement will be subject to review by the Office of Management and Budget (OMB) under the Paperwork Reduction Act.

FOR FURTHER INFORMATION CONTACT:

Dr. William Cibulas, Chief, Research Implementation Branch, Division of Toxicology, ATSDR, 1600 Clifton Road, NE., Mailstop E-29, Atlanta, Georgia 30333, telephone: (404) 498-0715, fax: (404) 498-0092. This notice will also be available on ATSDR's website at

http://www.atsdr.cdc.gov

or you may call the ATSDR Information Center at 1-888-422-8737.

SUPPLEMENTARY INFORMATION:

Background

CERCLA as amended by SARA (42 U.S.C. 9604(i)) requires that ATSDR (1) jointly with the EPA, develop and prioritize a list of hazardous substances found at National Priorities List (NPL) sites, (2) prepare toxicological profiles for these substances, and (3) assure the initiation of a research program to address identified data needs associated with the substances. Before starting such a program, ATSDR will consider recommendations of the Interagency Testing Committee on the type of research that should be done. This committee was established under Section 4(e) of the Toxic Substances Control Act of 1976 [15 U.S.C. 2604(e)](TSCA).

The major goals of the ATSDR SSARP are (1) to address the substance-specific information needs of the public and scientific community, and (2) to supply information necessary to improve the database used to conduct comprehensive public health assessments of populations living near hazardous waste sites. We anticipate that the information will help to establish linkages between levels of contaminants in the environment and levels in human tissue and organs

associated with adverse health effects. Once such links have been established, strategies to mitigate potentially harmful exposures can be developed. This program will also provide data that can be generalized to other substances or areas of science, including risk assessment of chemicals, thus creating a scientific information base for addressing a broader range of data needs.

ATSDR encourages the use of in vitro assessment methods and other innovative tools for filling priority data needs. For example, the agency believes that physiologically based pharmacokinetic (PBPK) modeling could serve as a valuable tool in predicting across route similarities (or differences) in toxicological responses to hazardous substances. Therefore, on a case-by-case basis, a priority data need can be filled using existing data and modeling. In addition, ATSDR is a member of NTP's Interagency Coordinating Committee on the Validation of Alternative Methods (ICCVAM) and supports development, validation, and acceptance of alternative toxicological test methods that reduce, refine, and replace the use of animals, as appropriate.

CERCLA section 104(i)(5)(D) states that it is the sense of Congress that the costs for conducting this research program “be borne by the manufacturers and processors of the hazardous substance in question,” as required in TSCA and the Federal Insecticide, Fungicide, and Rodenticide Act of 1972 (7 U.S.C. 136

et seq.

) (FIFRA), or by cost recovery from responsible parties under CERCLA. To execute this statutory intent, ATSDR developed a plan whereby parts of the SSARP are being conducted via the regulatory mechanisms referenced (TSCA/FIFRA), private-sector voluntarism, and the direct use of CERCLA funds.

The TASARC, composed of scientists from ATSDR, NTP, and EPA, has been set up to:

(1) Advise ATSDR on the assignment of priorities for mechanisms to address data needs,

(2) Coordinate knowledge of research activities to avoid duplication of research in other programs and under other authorities,

(3) Advise ATSDR on issues of science related to substance-specific data needs, and

(4) Maintain a scheduled forum that provides an overall review of the ATSDR SSARP.

TASARC has met 10 times since the initiation of the SSARP. It has guided referral of data needs to EPA and the associated development of test rules through TSCA. In addition, it has endorsed the proposals of several private-sector organizations to conduct voluntary research. Furthermore, TASARC has become a forum for other federal agencies to bring forth their research agendas. For example, it has coordinated research efforts on hazardous pollutants with the Office of Air and Radiation, EPA. TASARC has developed testing guidelines for immunotoxicity; and has endorsed the use of decision-support methodologies such as physiologically based pharmacokinetic (PBPK) modeling and benchmark-dose modeling, where appropriate.

Additional data needs are being addressed through collaborative research efforts with NTP, by ATSDR's Great Lakes Human Health Effects Research Program, and other agency programs. To date, 101 priority data needs associated with the first 50 substances (Table 1) are being addressed via these mechanisms.

Criteria for Evaluating Status of Priority Data Needs

To update the activities covered under the SSARP, criteria for evaluating the status of the priority data needs were developed. Based on these criteria and the review of the current literature, a priority data need can be filled, or unchanged. In the event a priority data need is considered filled, it does not necessarily mean that the study has been completed and that ATSDR has accepted the data. It does, however, indicate that the agency no longer considers it a priority to initiate additional studies at this time.

The criteria for evaluating the status of the priority data needs are described below.

General Criteria

A priority data need is filled:

• If it has been referred to one of the implementation mechanisms and research has been initiated, or

• If an updated ATSDR toxicological profile or other recent review document contains relevant new (peer-reviewed and publicly available) studies since the finalization of the priority data needs document; and it is generally agreed that a priority data need no longer exists.

A priority data need remains unchanged:

• If no mechanism or information has been identified to address the priority data need, or

• If the priority data need is included in the ATSDR/EPA test rule under development, or is associated with a pilot substance in EPA's Voluntary Children's Chemical Evaluation Program.

Specific Criteria

Since the 1999 SSARP update in the

Federal Register

, ATSDR has developed specific criteria for two categories of data needs described below.

•

Epidemiologic studies

—A priority data need is filled if multiple new studies assessing key health end points are available in ATSDR's updated toxicological profile and/or ongoing studies have been identified, e.g., human health studies supported by ATSDR's Great Lakes Human Health Effects Research Program or the Minority Health Professions Foundation Research Program. In some cases, ATSDR indicates that it will continue to evaluate new data as they become available to determine whether additional studies are needed.

•

Exposure levels in humans

—A priority data need is filled if (a) there are current and adequate biomonitoring data for exposed populations associated with health effects (from published or ongoing studies), or (b) there are reference range data (e.g., National Health and Nutrition Examination Survey (NHANES)) or generally agreed upon background population levels. In the latter case, ATSDR acknowledges that reference concentration data can support exposure and health assessments at waste sites, but the agency also continues to recognize the importance of collecting additional data on uniquely exposed populations at waste sites.

It should be noted that the status of the priority data needs may change in future updates of the SSARP as new information becomes available. Further, during the literature review, new studies may be identified suggesting other effects of concern, such as those related to endocrine disruptors and children's health, which have not been included in the original list of priority data needs. In such cases, additional priority data needs may be added to the research agenda. For example, for both tetrachloroethylene and trichloroethylene, the priority data need for developmental neurotoxicity study is now listed separately from the priority data need for one-species developmental toxicity (see Table 1). Therefore, the total number of priority data needs changed accordingly, i.e., from a total of 188 reported in the

Federal Register

notice in 1999 (64 FR 2760) to 190 in the current update notice. Also, research needs previously considered filled might be reassigned as priority data needs, e.g., if a previously derived Minimal Risk Level (MRL), a

health guidance value, was withdrawn from the updated ATSDR toxicological profile. Finally, a priority data need previously associated with an implementation mechanism, may no longer be addressed via that mechanism (or any other mechanism) if the study being conducted to fill the specific priority data need is discontinued.

Based on the above criteria, 62 priority data needs have been filled.

Update of Activities in the SSARP

An update of the activities associated with the mechanisms for implementing the ATSDR Substance-Specific Applied Research Program (SSARP) is discussed below. Publications and reports of research completed under the various implementation mechanisms are available by writing to ATSDR (

see

ADDRESSES

section of this Notice).

A. TSCA/FIFRA

In developing and implementing the SSARP, ATSDR, NTP, and EPA have identified a subset of priority data needs for substances of mutual interest to the federal programs. These data needs are being addressed through a program of toxicologic testing under TSCA according to established procedures and guidelines. On several occasions when ATSDR identified priority data needs for oral exposure, other agencies needed inhalation data. In response, ATSDR is considering proposals to conduct inhalation studies in conjunction with physiologically based pharmacokinetic (PBPK) studies in lieu of oral studies. ATSDR expects that inhalation data derived from these studies can be used with PBPK modeling to address its oral toxicity data needs. Currently, an EPA/ATSDR test rule, under development, includes eight ATSDR substances, i.e., benzene, chloroethane, cyanide (hydrogen cyanide and sodium cyanide), methylene chloride, tetrachloroethylene, toluene and trichloroethylene, and addresses 18 ATSDR priority data needs (Table 2). The test rule is presently undergoing ATSDR and EPA final review. We anticipate it will be available for public comment in the near future.

TASARC has established an interagency task force on metals and has conducted a survey to assess federal agencies' needs for testing metals. Currently, the task force has agreed to examine at least seven metals included in the ATSDR's SSARP (arsenic, beryllium, chromium, manganese, mercury, nickel, and selenium, associated with 22 priority data needs) (Table 2). The EPA will solicit testing proposals for these metals and pursue test rule development for these metals at a later date.

B. Private-Sector Voluntarism

On February 7, 1992, as part of the Substance-Specific Applied Research Program (SSARP), ATSDR announced a set of proposed procedures for conducting voluntary research (57 FR 4758). Revisions based on public comments were published on November 16, 1992 (57 FR 54160). Private-sector organizations were encouraged to volunteer to conduct research to fill specific priority data needs at no expense to ATSDR.

To date, ATSDR has established agreements with the American Chemistry Council (ACC) [formerly the Chemical Manufacturers Association (CMA)], the General Electric Company (GE), and the Halogenated Solvents Industry Alliance, Inc. (HSIA) to conduct substance-specific research (Table 2). Through the voluntary research efforts of these organizations, at least 16 research needs for polychlorinated biphenyl compounds [PCBs], methylene chloride, tetrachloroethylene, trichloroethylene, and vinyl chloride are being addressed (Table 2).

American Chemistry Council (ACC) Formerly the Chemical Manufacturers Association (CMA)

In 1996, ATSDR entered into a memorandum of understanding (MOU) with ACC covering two studies, “Vinyl chloride: Combined inhalation two-generation reproduction and developmental toxicity study in CD rats.” In November 2000, ATSDR accepted the final reports of the studies.

General Electric Company (GE)

In 1995, ATSDR entered into an MOU with SSARP covering two studies on PCBs: (1) “An assessment of the chronic toxicity and oncogenicity of Aroclors 1016, 1242, 1254, and 1260 administered in diet to rats,” including “PCB congener analyses,” and (2) “Metabolite detection as a tool for determining naturally occurring aerobic PCB biodegradation.” While the above studies do not address ATSDR's priority data needs for PCBs, they do address other agency research needs for these substances.

The agency accepted the final report for the chronic toxicity and oncogenicity of the four aroclors in October 1997,and the final report for the aerobic biodegradation study in July 1999.

Halogenated Solvents Industry Alliance (HSIA)

In 1995, ATSDR entered into an MOU with HSIA covering studies to address three priority data needs for methylene chloride. The studies, “Addressing priority data needs for methylene chloride with physiologically based pharmacokinetic modeling,” evaluated acute- and subchronic-duration toxicity and developmental toxicity via oral exposure. The data were obtained using physiologically based pharmacokinetic modeling. The final report for these studies was accepted by the agency in February 1997.

In September 1999, HSIA entered into a second MOU with ATSDR to conduct a study, “Methylene chloride: 28 day inhalation toxicity study in the rat to assess potential immunotoxicity.” The agency accepted the final report for the study in November 2000. HSIA is in the process of obtaining oral data from the inhalation study using PBPK modeling. This is because ATSDR has determined ingestion of contaminated environmental media to be the primary exposure route at hazardous waste sites. HSIA intends to conduct similar immunotoxicity studies for tetrachloroethylene and trichloroethylene.

In February 2000, ATSDR signed a third MOU with HSIA, which conducted a study, “Trichloroethylene: Inhalation Developmental Toxicity Study in CD Rats.” The agency accepted the final report of the study in September 2001. As in the case of the methylene chloride immunotoxicity study described above, HSIA intends to obtain developmental toxicity data for oral exposure using PBPK modeling. Also, HSIA plans to perform similar developmental toxicity studies for tetrachloroethylene. Finally, ATSDR and HSIA are continuing discussion to address additional priority data needs for trichloroethylene and tetrachloroethylene in conjunction with EPA's pilot studies for its Voluntary Children's Chemical Evaluation Program.

In addition to the substance-specific MOUs described above, in March 2001, ATSDR also signed an MOU with the Electric Power Research Institute, Inc. (EPRI) on “Verification of Techniques for Assessing the Effects of Neurotoxicants on Neurodevelopment in Children.” The objective of the study is to validate a battery of neurodevelopmental tests for use in assessing the effects of prenatal or postnatal exposure to developmental neurotoxicants. The study includes an evaluation of a broad spectrum of

functions; therefore, the validation of these tests will be useful for further assessing the developmental neurotoxicity of some of the ATSDR priority substances such as the PCBs, methylmercury, and lead. In addition to the private sector support (EPRI), ATSDR is coordinating a federal effort (via interagency agreements with EPA, Food and Drug Administration [FDA] and NIEHS) to support the study.

C. CERCLA-Funded Research (Minority Health Professions Foundation Research Program)

During FY 1992, ATSDR announced a $4 million cooperative agreement program with the Minority Health Professions Foundation (MHPF) to support substance-specific investigations. A not-for-profit Internal Revenue Code 501(c)(3) organization, the MHPF comprises 11 minority health professions schools. Its primary mission is to research health problems that disproportionately affect poor and minority citizens. The purpose of this cooperative agreement is to address substance-specific data needs for priority hazardous substances identified by ATSDR. In addition, this agreement strengthens the environmental health research opportunities for scientists and students at MHPF member institutions and enhances existing disciplinary capacities to conduct research in toxicology and environmental health.

In the first 5-year project period that concluded during FY 1997, nine priority data needs for 21 priority hazardous substances and 22 other research needs for these and other substances were addressed. The MHPF has developed a report, “Environmental Health and Toxicology Research Program: Meeting Environmental Health Challenges Through Research, Education, and Service,” that describes the research findings and other successes from the first 5 years of the program. New research initiated in the second 5-year project period includes studies to address 10 additional priority data needs for chlordane, 1,2-dibromo-3-chloropropane, di-n-butyl phthalate, lead, manganese, the polycyclic aromatic hydrocarbons (PAHs), zinc, and eight other research needs.

To date, the MHPF activities have resulted in the publication of 50 manuscripts in peer-reviewed journals. The institutions receiving awards and their current respective research projects that fill identified research needs are listed in Table 2.

D. National Toxicology Program (NTP)

Section 104(i)(5) of CERCLA directs the administrator of ATSDR (in consultation with the administrator of EPA and agencies and programs of the Public Health Service) to assess whether adequate information on the health effects of priority hazardous substances found at NPL sites is available. Where adequate information is not available, ATSDR, in cooperation with the National Toxicology Program (NTP), is required to assure the initiation of a program of research designed to determine these health effects (and techniques for developing methods to determine such health effects).

ATSDR has been collaborating with NTP to address priority data needs of mutual interest, including (1) di-n-butyl phthalate: dose-response data in animals for acute-duration exposure via oral exposure route, (2) carbon tetrachloride: immunotoxicology study via oral exposure, and (3) heptachlor: reproductive toxicity study via oral exposure (Table 2).

E. Great Lakes Human Health Effects Research Program

Some of the priority data needs identified in the SSARP have been independently identified as research needs through the ATSDR Great Lakes Human Health Effects Research Program, a separate research program.

In support of the Great Lakes Critical Programs Act of 1990, ATSDR announced in FY 1992 the availability of $2 million for a grant program to conduct research on the potential for short- and long-term adverse health effects from consumption of contaminated fish from the Great Lakes basin. Research undertaken through this program is intended to build on and amplify the results of past and ongoing fish consumption research in the Great Lakes basin. The ATSDR-supported research projects focus on known high-risk populations to define further the human health consequences of exposure to persistent toxic substances (PTSs) identified in the Great Lakes basin. These at-risk populations include sport anglers; African Americans, Asians and other non-English speaking populations; pregnant women; fetuses, nursing infants, and children of mothers who consume contaminated Great Lakes sport fish; the elderly, and the urban poor. To date, the research activities of the ATSDR Great Lakes research program have resulted in 55 publications in peer-reviewed journals.

Currently, 14 priority data needs for 24 priority hazardous substances (including 15 PAHs) identified in the SSARP are being addressed through this program. The institutions receiving awards and their respective studies are listed in Table 2.

F. Other ATSDR Programs

In its role as a public health agency addressing environmental health, ATSDR may collect human data to validate substance-specific exposure and toxicity findings. The need for additional information on levels of contaminants in humans has been identified, and remains as a priority data need for 49 of the first 50 priority substances (Table 1). ATSDR will obtain this information through exposure and health effects studies, and through establishing and using substance-specific subregistries of people within the agency's National Exposure Registry who have potentially been exposed to these substances.

The list of the 50 priority hazardous substances in the SSARP was forwarded to ATSDR's Exposure and Disease Registry Branch (EDRB), Division of Health Studies, for consideration as potential candidates for subregistries of exposed persons, based on criteria described in its 1994 document, “National Exposure Registry: Policies and Procedures Manual (Revised),” Agency for Toxic Substances and Disease Registry, Public Health Service, U.S. Department of Health and Human Services, Atlanta, Georgia, NTIS Publication No. PB95-154571. To date, of the first 50 priority substances in the SSARP, ATSDR has established subregistries for benzene, chromium, and trichloroethylene. Arsenic, cadmium, and lead are not considered to be in the pool of candidate substances for an exposure registry at this time, and, therefore, are not considered priority data needs. This decision will be reevaluated as more information on the chemicals and exposure sites become available. All other substances in the SSARP (Table 1) remain in the candidate pool and therefore continue to be classified as priority data needs. They will be considered for selection as primary contaminants during each selection process.

G. Conclusion

The results of the research conducted via the SSARP are expected to provide information necessary to improve the database used to conduct comprehensive public health assessments of populations living near hazardous waste sites. The information will enable the agency to establish linkages between levels of contaminants in the environment and levels in human tissue and organs associated with adverse health effects, ultimately helping to determine methods for interdicting exposure and mitigating toxicity. This program will also provide

data that can be generalized to other substances or areas of science, including risk assessment of chemicals, thus creating a scientific information base for addressing a broader range of data needs. The agency plans to provide an update on the status of this research program approximately every 3 years.

Dated: January 25, 2002.

Georgi Jones,

Director, Office of Policy and External Affairs, Agency for Toxic Substances and Disease Registry.

Table 1.—ATSDR's Substance-Specific Priority Data Needs for 50 Priority Hazardous Substances

Substances

PDN ID

PDN description

Program

Status change

Comments

Aldrin/Dieldrin

Dose-response data in animals for intermediate-duration oral exposure

Filled

An MRL was derived in the 2000 updated toxicological profile.

Bioavailability from soil

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

This priority data need, previously addressed in a study in the Great Lakes research program, is no longer investigated in that study.

Potential candidate for subregistry of exposed persons

ATSDR

Arsenic

Comparative toxicokinetic studies to determine if an appropriate animal species can be identified

EPA.

Half-lives in surface water, groundwater

EPA

Bioavailability from soil

EPA

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

G. Lakes

Filled

Background level data are available in ATSDR's 1993 toxicological profile, and at least seven ATSDR studies that evaluated urine arsenic levels and potential adverse health effects are available. Also, additional studies are available in ATSDR's 2000 updated toxicological profile.

Benzene

Dose-response data in animals for acute- and intermediate-duration oral exposure. The subchronic study should include an extended reproductive organ histopathology

EPA

Two-species developmental toxicity study via oral exposure

EPA

Previously planned study in the MHPF research program to address this priority data need was canceled.

Neurotoxicology battery of tests via oral exposure

EPA

Epidemiologic studies on the health effects of benzene (Special emphasis end points include immunotoxicity)

Filled

Based on an evaluation of the data in ATSDR's 1997 updated toxicological profile. ATSDR will continue to evaluate new data as they become available to determine if additional studies are needed.

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

Filled

Reference range concentrations are available (Ashley et al. 1992, 1994; Needham et al. 1995), and at least one ATSDR study that evaluated blood benzene levels and potential adverse health effects is available. ATSDR acknowledges that reference concentration data can support exposure and health assessments at waste sites, but the agency also continues to recognize the importance of collecting additional data on uniquely exposed populations at waste sites.

Beryllium

Dose-response data in animals for acute- and intermediate-duration inhalation exposures. The subchronic study should include extended reproductive organ histopathology

EPA

Two-species developmental toxicity study via inhalation exposure

EPA

Environmental fate in air; factors affecting bioavailability in air

EPA

Analytical methods to determine environmental speciation

Filled

Based on an evaluation of the data in ATSDR's 2000 updated toxicological profile.

Immunotoxicology battery of tests following oral exposure

EPA

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

Filled

Reference range concentrations in urine are available (Paschal et al. 1998). ATSDR acknowledges that reference concentration data can support exposure and health assessments at waste sites, but the agency also continues to recognize the importance of collecting additional data on uniquely exposed populations at waste sites.

Potential candidate for subregistry of exposed persons

ATSDR

Cadmium

Analytical methods for biological tissues and fluids and environmental media

Filled

Based on an evaluation of the data in ATSDR's 1999 updated toxicological profile.

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

G. Lakes

Filled

Referent population urine cadmium levels are available (NHANES III), and at least nine ATSDR studies that evaluated blood and urine cadmium levels and potential adverse health effects are available.

Carbon tetrachloride

Dose-response data in animals for chronic oral exposure. The study should include extended reproductive organ and nervous tissue histopathology.

Immunotoxicology battery of tests via oral exposure

NTP

Filled

NTP dose-finding study and one new study in ATSDR's 1994 updated toxicological profile addressed the priority data need.

Half-life in soil

Filled

One new study in ATSDR's 1994 updated toxicological profile provided information on half-life in soil.

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

Filled

Reference range concentrations in blood are available (Ashley et al. 1992, 1994; Needham et al. 1995). ATSDR acknowledges that reference concentration data can support exposure and health assessments at waste sites, but the agency also continues to recognize the importance of collecting additional data on uniquely exposed populations at waste sites.

Potential candidate for subregistry of exposed persons

ATSDR

Chlordane

Oral multigenerational studies to evaluate reproductive toxicity

MHPF

NTP.

Filled

Availability of ongoing study in the MHPF research program and anticipated initiation of an NTP study in 2002.

Bioavailability studies following ingestion of contaminated media

Exposure levels in humans living near hazardous waste sites and other populations potentially exposed to chlordane

Potential candidate for subregistry of exposed persons

ATSDR

Chloroethane

Dose-response data in animals for acute- and intermediate-duration oral exposures. The subchronic study should include an evaluation of immune and nervous system tissues, and extended reproductive organ histopathology

EPA

Dose-response data in animals for chronic inhalation exposures. The study should include an evaluation of nervous system tissues

EPA

Potential candidate for subregistry of exposed persons

ATSDR

Chloroform

Dose-response data in animals for intermediate-duration oral exposure

Filled

An MRL was derived in ATSDR's 1997 updated toxicological profile.

Epidemiologic studies on the health effects of chloroform (Special emphasis end points include cancer, neurotoxicity, reproductive and developmental toxicity, hepatotoxicity, and renal toxicity)

Filled

Based on an evaluation of the data in ATSDR's 1997 updated toxicological profile. ATSDR will continue to evaluate new data as they become available to determine if additional studies are needed.

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

Filled

Reference range concentrations in blood are available (Ashley et al. 1992, 1994; and Needham et al. 1995). ATSDR acknowledges that reference concentration data can support exposure and health assessments at waste sites, but the agency also continues to recognize the importance of collecting additional data on uniquely exposed populations at waste sites.

Potential candidate for subregistry of exposed persons

ATSDR

Chromium

10A

Dose-response data in animals for acute-duration exposure to chromium (VI) and (III) via oral exposure and for intermediate-duration exposure to chromium (VI) via oral exposure

EPA

10B

Multigeneration reproductive toxicity study via oral exposure to chromium (III) and (VI)

EPA

10C

Immunotoxicology battery of tests following oral exposure to chromium (III) and (VI)

EPA

10D

Two-species developmental toxicity study via oral exposure to chromium (III) and (VI)

EPA

10E

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers.

G. Lakes

Filled

Reference range concentrations in urine are available (Paschal et al. 1998). Also, at least two ATSDR studies that evaluated urine chromium levels and potential adverse health effects are available. In addition, this PDN is being addressed in a study in the Great Lakes research program.

Cyanide

11A

Dose-response data in animals for acute- and intermediate-duration exposures via inhalation. The subchronic study should include extended reproductive organ histopathology and evaluation of neurobehavioral and neuropathological end points

EPA

11B

Two-species developmental toxicity study via oral exposure

EPA

11C

Evaluation of the environmental fate of cyanide in soil

Filled

A study addressing the priority data need was submitted by industry to EPA in response to EPA's solicitation for proposals for test rule making. Scientists from EPA and ATSDR reviewed the study and considered that this research need is no longer a priority.

11D

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

11E

Potential candidate for subregistry of exposed persons

ATSDR

1,2-dibromo-3-chloropro pane

12A

Dose-response data in animals for acute- duration exposure via the oral route (including reproductive organ histopathology)

12B

Dose-response data in animals for chronic-duration exposure via the oral route (including reproductive organ histopathology)

12C

Two-species developmental toxicity study via oral exposure

12D

Immunotoxicology testing battery via oral exposure

Previously planned study in the MHPF research program to address this priority data need was canceled.

12E

Neurotoxicology testing battery via oral exposure

Previously planned study in the MHPF research program to address this priority data need was canceled.

12F

Exposure levels in humans living near hazardous waste sites and other exposed populations, such as exposed workers

12G

Potential candidate for subregistry of exposed persons

ATSDR

DDT

13A

Dose-response data in animals for chronic-duration oral exposure

13B

Comparative toxicokinetic study (across routes/species)

13C

Bioavailability and bioaccumulation from soil

13D

Epidemiologic studies on the health of DDT, DDD, and DDE (Special emphasis end points include immunotoxicity, and reproductive and developmental toxicity

G. Lakes

Filled

Multiple new studies in ATSDR's 2000 updated toxicological profile and five ongoing studies in the Great Lakes research program are available.

13E

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

G. Lakes

13F

Potential candidate for subregistry of exposed persons

ATSDR

Di(2-ethyl-hexyl)phthalate

14A

Epidemiologic studies on the health effects of DEHP (Special emphasis end points include cancer)

14B

Dose-response data in animals for acute- and intermediate-duration oral exposures. The subchronic study should include an extended histopathologic evaluation of the immunologic and neurologic systems

This research need is reassigned as a priority data need because of the data in ATSDR's 2000 updated toxicological profile. Specifically, the previously developed MRL for acute-duration (1993 toxicological profile) was withdrawn, and a provisional MRL for intermediate-duration was derived replacing the previously established one.

14C

Multigeneration reproductive toxicity study via oral exposure

This research need is reassigned as a priority data need based on an evaluation of the data in ATSDR's 2000 updated toxicological profile. Also, the NTP Center for the Evaluation of Risks to Human Reproduction Expert Panel Report (October 2000) has identified critical data needs for reproductive toxicity

14D

Comparative toxicokinetic studies (Studies designed to examine how primates metabolize and distribute DEHP as compared with rodents via oral exposure)

The NTP Center for the Evaluation of Risks to Human Reproduction Expert Panel Report (October 2000) has also identified critical data needs for toxicokinetic information.

14E

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

14F

Potential candidate for subregistry of exposed persons

ATSDR

Di-n-butyl phthalate

15A

Dose-response data in animals for acute-duration exposure via the oral route

NTP

Filled

NTP completed a 14-day study.

15B

Dose-response data in animals for chronic-duration exposure via the oral route

15C

Carcinogenicity studies via oral exposure

15D

In vivo

genotoxicity studies

MHPF

Filled

Availability of ongoing studies in the MHPF research program.

15E

Immunotoxicology studies via oral exposure

Previously planned study in the MHPF research program to address this priority data need was canceled.

15F

Neurotoxicity studies via oral exposure

Previously planned study in the MHPF research program to address this priority data need was canceled.

15G

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

15H

Environmental fate of di-n-butyl phthalate in environmental media

15I

Bioavailability in contaminated environmental media near hazardous waste sites

15J

Potential candidate for subregistry of exposed persons

ATSDR

Disulfoton

16A

Immunotoxicology testing battery following oral exposure

16B

Exposure levels of disulfoton in tissues/fluids for populations living near hazardous waste sites and other populations, such as exposed workers

16C

Disulfoton should be considered as a potential candidate for a subregistry of exposed persons

ATSDR

Endosulfan (α,β, and sulfate)

17A

Acute-duration oral exposure

17B

Data on sensitive neurologic end point following oral exposure

17C

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

17D

Data on the bioavailability of endosulfan from soil

17E

Potential candidate for subregistry of exposed persons

ATSDR

Endrin/endrin aldehyde

18A

Dose-response animal data for acute oral exposure to endrin

18B

Multigeneration reproductive toxicity studies via oral exposure to endrin

NTP

18C

Accurately describe the toxicokinetics of endrin and its degradation products and identify the animal species to be used as the most appropriate model for human exposure

18D

Exposure levels for endrin and its degradation products in humans living near hazardous waste sites

18E

Accurately describe the environmental fate of endrin, including environmental breakdown products and rates, media half-lives, and chemical and physical properties of the breakdown products that help predict mobility and volatility

18F

Potential candidate for subregistry of exposed persons

ATSDR

Heptachlor/heptachlor epoxide

19A

Dose-response animal data for acute- and intermediate-duration oral exposures, including immunopathology

19B

Multigeneration reproductive toxicity studies via the oral route of exposure

NTP

Filled

Availability of publication “The effects of perinatal/juvenile heptachlor exposure on adult immune and reproductive system function in rats” by Smialowicz et al. (2001), Toxicological Sciences 61:164-75.

19C

Two-species developmental toxicity studies via the oral route of exposure

19D

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

19E

Bioavailability from contaminated air, water, and soil and bioaccumulation potential

19F

Potential candidate for subregistry of exposed persons

ATSDR

Hexachloro-butadiene

20A

Dose-response data in animals for acute-duration exposure via the oral route

20B

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

20C

Environmental fate studies that determine the extent to which hexachlorobutadiene volatilizes from soil, and studies that determine the reactions and rates which drive degradation in soil

20D

Bioavailability studies in soil and plants

20E

Potential candidate for subregistry of exposed person

ATSDR.

Hexachloro-cyclohexane (α, β, δ, and γ)

21A

Dose-response data for chronic-duration oral exposure

Filled

An MRL was derived in ATSDR's 1999 updated toxicological profile.

21B

Mechanistic studies on the neurotoxicity, hepatotoxicity, reproductive toxicity, and immunotoxicity of hexachlorocyclohexane

21C

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

Filled

Reference range concentrations in blood are available. ATSDR acknowledges that reference concentration data can support exposure and health assessments at waste sites, but the agency also continues to recognize the importance of collecting additional data on uniquely exposed populations at waste sites.

21D

Potential candidate for subregistry of exposed persons

ATSDR.

Lead

22A

Mechanistic studies on the neurotoxic effects of lead

MHPF

Filled

Multiple new studies (13 publications from the MHPF research program + numerous new published studies in ATSDR's 1999 updated toxicological profile) are available.

22B

Analytical methods for tissue levels

MHPF

Filled

A publication from the MHPF research program and numerous studies in ATSDR's 1999 toxicological profile are available.

22C

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

MHPF

G. Lakes

Filled

Referent population blood and urine lead levels are available (NHANES III; Paschal et al. 1998), and at least 19 ATSDR studies that evaluated blood lead levels and potential adverse health effects are available.

Manganese

23A

Dose-response data for acute- and intermediate-duration oral exposures (the subchronic study should include reproductive histopathology and an evaluation of immunologic parameters including manganese effects on plaque-forming cells (SRBC), surface markers (D4:D8 ratio), and delayed hypersensitivity reactions)

MHPF

EPA

Filled

Availability of ongoing studies in the MHPF research program.

23B

Toxicokinetic studies on animals to investigate uptake and absorption, relative uptake of differing manganese compounds, metabolism of manganese, and interaction of manganese with other substances following oral exposure

MHPF

EPA

Filled

Avaialbiltiy of ongoing studies in the MHPF research program.

23C

Epidemiological studies on the health effects of manganese (Special emphasis end points include neurologic, reproductive, developmental, immunologic, and cancer)

Filled

Based on evaluation of the data in ATSDR's 2000 updated toxicological profile. ATSDR will continue to evaluate new data as they become available to determine if additional studies are needed.

23D

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

23E

Relative bioavailability of different manganese compounds and bioavialability of manganese from soil

EPA.

Mercury

24A

Multigeneration reproductive toxicity study via oral exposure

MHPF

Filled

Three publications from the MHPF research program are available.

24B

Dose-response data in animals for chronic-duration oral exposure

EPA

Filled

An MRL was derived in ATSDR's 1999 updated toxicological profile.

24C

Immunotoxicology battery of tests via oral exposure

EPA.

24D

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

G. Lakes

Filled

Background levels data are available in ATSDR's 1997 updated toxicological profile, and multiple studies that evaluated blood, urine, and hair mercury levels and potential adverse health effects are available (Five ATSDR studies + at least eight ongoing studies of the Great Lakes research program).

24E

Potential candidate for subregistry of exposed persons

ATSDR.

Methoxychlor

25A

Evaluate neurologic effects after long-term, low-level oral exposure

Filled

Based on an evaluation of the data in ATSDR's 2000 updated toxicological profile.

25B

Exposure levels of methoxychlor and primary metabolities in humans living near hazardous waste sites and in those individuals with the potential to ingest it

25C

Evaluate the fate, transport, and levels of the degradation products of methoxychlor in soil

25D

Potential candidate for subregistry of exposed persons

ATSDR.

Methylene chloride

26A

Dose-response data in animals for acute- and intermediate-duration oral exposure. The subchronic study should include extended reproductive organ histopathology, neuropathology, and immunopathology

EPA

Vol Res.

Filled

ATSDR accepted HSIA's toxicity study for acute- and intermediate-exposure duration in February 1997. ATSDR accepted HSIAs immunotoxicity study via inhalation in November 2000. Currently, HSIA is conducting PBPK modeling to obtain data for oral exposure using the data from its inhalation study. Neurotoxicity screening battery testing remains in the ATSDR/EPA test rule under development.

26B

Two-species developmental toxicity study via the oral route

EPA

Vol Res.

Filled

ATSDR accepted HSIA's study in February 1997.

26C

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

Filled

26D

Potential candidate for subregistry of exposed persons

ATSDR.

Nickel

27A

Epidemiologic studies on the health effects of nickel (Special emphasis end points include reproductive toxicity

Filled

At least two new relevant studies in ATSDR's 1997 updated toxicological profile are available. ATSDR will continue to evaluate new data as they become available to determine if additional studies are needed.

27B

Two-species developmental toxicity study via the oral route

EPA

Filed

In ATSDR's 1997 updated toxicological profile, a new study confirming the results of two previous studies is available

27C

Dose-response data in animals for acute- and intermediate-duration oral exposures

EPA.

27D

Neurotoxicology battery of tests via oral exposure

EPA.

27E

Bioavailability of nickel from soil

EPA.

27F

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

G. Lakes

Filled

Based on availability of the study in the Great Lakes research program and an evaluation of ATSDR's 1997 updated toxicological profile.

27G

Potential candidate for subregistry of exposed persons

ATSDR.

PAHs (Includes 15 substances)

28A

Dose-response data in animals for intermediate-duration oral exposures. The subchronic study should include extended reproductive organ histopathology and immunopathology

MHPF

Filled

MRLs for four PAHs were derived in ATSDR's 1995 updated toxological profile. A publication from the MHPF research program addressing this priority data need is available.

28B

Two-species developmental toxicity study via inhalation or oral exposure

MHPF

Filled

Ongoing studies in the MHPF research program and one publication from the program are available.

28C

Mechanistic studies on PAHs, on how mixtures of PAHs can influence the ultimate activation of PAHs, and on how PAHs affect rapidly proliferating tissues

MHPF

Filled

At least 12 new studies in ATSDR's 1995 updated toxicological profile and two publications from the MHPF research program are available.

28D

Dose-response data in animals for acute- and intermediate-duration inhalation exposures. the subchronic study should include extended reproductive organ histopathology and immunopathology

MHPF

Filled

Ongoing studies in the MHPF research program and one publication from the program are available.

28E

Epidemiologic studies on the health effects of PAHs (Special emphasis end points include cancer, dermal, hemolymphatic, and hepatic toxicity

Filled

At least three new studies in ATSDR's 1995 updated toxicological profile are available. ATSDR will continue to evaluate new data as they become available to determine if additional studies are needed.

28F

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

G. Lakes

Filled

Based on ongoing study in the Great Lakes research program and an evaluation of the ATSDR 1995 updated toxicological profile. Also, the agency continues to recognize the importance of collecting additional data on uniquely exposed populations at waste sites.

28G

Potential candidate for subregistry of exposed persons

ATSDR.

PCBs

29A

Dose-response data in animals for acute- and intermediate-duration oral exposures

G. Lakes

Although an MRL for intermediate-exposure duration was derived in ATSDR's 2000 updated toxicological profile, an MRL for acute-exposure duration is still lacking.

29B

Biodegradation of PCBs in water; bioavailability of PCBs in air, water, and soil

29C

Dose-response data in animals for acute- and intermediate-duration inhalation exposures. The subchronic study should include extended reproductive organ histopathology

29D

Epidemiologic studies on the health effects of PCBs (Special emphasis end points include immunotoxicity, gastrointestinal toxicity, liver toxicity, kidney toxicity, thyroid toxicity, and reproductive/developmental toxicity)

G. Lakes

Filled

Multiple new published studies in ATSDR's 2000 updated toxicological profile and at least nine ongoing studies in the Great Lakes research program are available.

29E

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

G. Lakes

Filled

Background levels data are available (ATSDR's 1997 updated toxicological profile, and Needham et al. 1996). Also, multiple studies that evaluated blood and breast milk PCB levels and potential adverse health effects are available (at least six ATSDR studies + at least eight ongoing studies in the Great Lakes research program).

29F

Potential candidate for subregistry of exposed persons

ATSDR

29G

(5)

Chronic toxicity and oncogenicity via oral exposure

Vol Res

Filled

ATSDR accepted the final report of the GE in October 1997.

29H

(5)

Aerobic PCB biodegradation in sediment

Vol Res

Filled

ATSDR accepted the final report of the GE study in July 1999.

29I

(5)

PCB congener analysis

Vol Res

G. Lakes

Filled

ATSDR accepted the final report of the GE study in October 1997. Also, ongoing studies in the Great Lakes research program are available.

Selenium

30A

Dose-response data in animals for acute-duration oral exposure

EPA

30B

Immunotoxicology battery of tests via oral exposure

EPA

30C

Epidemiologic studies on the health effects of selenium (Special emphasis end points include cancer, reproductive and developmental toxicity, hepatotoxicity, and adverse skin effects)

Filled

Based on an evaluation of ATSDR's 2001 updated toxicological profile. ATSDR will continue to evaluate new data as they become available to determine if additional studies are needed.

30D

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

G. Lakes

Filled

Referent population serum selenium levels are known (NHANES III). Two ongoing studies in the Great Lakes research program are available. ATSDR acknowledges that reference concentration data can support exposure and health assessments at waste sites, but the agency also continues to recognize the importance of collecting additional data on uniquely exposed populations at waste sites.

30E

Potential candidate for subregistry of exposed persons

ATSDR

Tetrach loroethy lene

31A

Dose-response data in animals for acute-duration oral exposure, including neuropathology and demeanor, and immunopathology

Filled

An MRL was derived in the 1997 updated toxicological profile.

31B

Multigeneration reproductive toxicity study via oral exposure

Vol Res

HSIA's inhalation study was accepted by ATSDR and included in ATSDR's 1997 updated toxicological profile. However, ATSDR has identified ingestion of contaminated environmental media to be the primary exposure route for this chemical at waste sites. HSIA plans to obtain the oral data from the inhalation study by conducting PBPK modeling.

31C

Dose-response data in animals for intermediate-duration oral exposure, including neuropathology, and immunopathology

EPA

Vol Res.

HSIA intends to obtain oral data for neurotoxicity by PBPK modeling, and to conduct an immunotoxicity study.

31D

One-species developmental toxicity study via oral exposure

EPA

Vol Res

31E

Developmental neurotoxicity study via oral exposure

EPA

Vol Res

31F

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

Filled

31G

Potential candidate for subregistry of exposed persons

ATSDR

Toluene

32A

Dose-response data in animals for acute- and intermediate-duration oral exposures. The subchronic study should include an extended histopathologic evaluation of the immune system

EPA

Filled

Availability of MRLs for acute- and intermediate-exposure durations in ATSDR's 2000 updated toxicological profile. Immunotoxicity study remains in the ATSDR/EPA test rule under development.

32B

Comparative toxicokinetic studies (Characterization of absorption, distribution, and excretion via oral exposure)

Filled

Based on evaluation of the data in ATSDR's 2000 updated toxicological profile.

32C

Neurotoxicology battery of tests via oral exposure

EPA

MHPF

32D

Mechanism of toluene-induced neurotoxicity

Filled

At least 15 studies in ATSDR's 1994 updated toxicological profile and additional new data in ATSDR's 2000 updated toxicological profile are available.

32E

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed worker

Filled

Reference range concentrations in blood are available (Ashley et al. 1992, 1994; Needham et al. 1995), and additional data in ATSDR's 2000 updated toxicological profile are available. ATSDR acknowledges that reference concentration data can support exposure and health assessments at waste sites, but the agency also continues to recognize the importance of collecting additional data on uniquely exposed populations at waste sites.

32F

Potential candidate for subregistry of exposed persons

ATSDR

Toxaphene

33A

Identify the long-term health consequences of exposure to environmental toxaphene via oral exposure.

33B

Conduct additional immunotoxicity studies for chronic-duration via oral route of exposure

33C

Conduct additional neurotoxicity studies for chronic-duration via oral route of exposure

33D

Exposure levels in humans living in areas near hazardous waste sites with toxaphene and in those individuals with the potential to ingest it

33E

Potential candidate for subregistry of exposed persons.

ATSDR

Trichloroethylene

34A

Dose-response data in animals for acute-duration oral exposure

Filled

An MRL was derived in ATSDR's 1997 updated toxicological profile.

34B

Dose-response data in animals for intermediate-duration oral exposure

EPA

Vol Res

34C

Neurotoxicology battery of tests via the oral route

EPA

MHPF

Vol Res

34D

Immunotoxicology battery of tests via the oral route

EPA

Vol Res

34E

One-species developmental toxicity study via oral exposure

Vol Res

ATSDR accepted HSIA's final report for an inhalation developmental toxicity study in September 2001. HSIA is currently using PBPK modeling to obtain data for oral exposure using the data from its inhalation study.

34F

Developmental neurotoxicity study via oral exposure

EPA

Vol Res

34G

Epidemiologic studies on the health effects of trichloroethylene (Special emphasis end points include cancer, hepatotoxicity, renal toxicity, developmental toxicity, and neurotoxicity)

Filled

Based on evaluation of the data in ATSDR's 1997 updated toxicological profile. ATSDR will continue to evaluate new data as they become available to determine if additional studies are needed.

34H

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

Filled

Vinyl chloride

35A

Dose-response data in animals for acute-duration inhalation exposure

Filled

An MRL was derived in ATSDR's 1997 updated toxicological profile.

35B

Multigeneration reproductive toxicity study via inhalation

Vol Res

Filled

ATSDR accepted the final report of ACC's study in November 2000.

35C

Dose-response data in animals for chronic-duration inhalation exposure

35D

Mitigation of vinyl chloride-induced toxicity

35E

Two-species developmental toxicity study via inhalation.

Vol Res

Filled

ATSDR accepted the final report of ACC's study in November 2000.

35F

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

35G

Potential candidate for subregistry of exposed persons

ATSDR

Zinc

36A

Dose-response data in animals for acute- and intermediate-duration oral exposures. The subchronic study should include an extended histopathologic evaluation of the immunologic and neurologic systems

MHPF

Filled

Ongoing studies in the MHPF research program are available.

36B

Multigeneration reproductive toxicity study via oral exposure

MHPF

36C

Carcinogenicity testing (2-year bioassay) via oral exposure

36D

Exposure levels in humans living near hazardous waste sites and other populations, such as exposed workers

This priority data need, previously anticipated to be addressed under the voluntary research program, is not being investigated under any of the ATSDR research programs.

36E

Potential candidate for subregistry of exposed persons

ATSDR

Priority data need identification number.

Programs addressing data needs. ATSDR=ATSDR's Division of Health Studies; EPA=Environmental Protection Agency; G. Lakes=Great Lakes Human Health Effects Research Program; MHPF=Minority Health Professions Foundation schools; NTP=National Toxicology Program; Vol Res=Voluntary research.

PDN can be filled or remain unchanged based on reevaluation of the database using criteria developed by ATSDR.

ACC=American Chemistry Council; Ashley et al. 1992=Ashley DL, Bonin MA, Cardinali FL, et al. Anal Chem (1992) 64:1021-29; Ashley et al. 1994=Ashley DL, Bonin MA, Cardinali FL et al., Clin Chem (1994) 40/7:1401-4; ATSDR studies=Studies conducted by ATSDR's Division of Health Studies; GE=General Electric Company ; HSIA=Halogenated Solvents Industry Alliance, Inc.; MHPF=Minority Health Professions Foundation schools; MRL=Minimal Risk Level; Needham et al. 1995=Needham LL, Hill RH Jr, Ashley DL, Pirkle JL, and Sampson EJ. Environ Health Perspect 103 (Suppl 3):89-94; Needham et al. 1996=Needham LL, Patterson DG Jr, Burse VW, Paschal DC, Turner WE, and Hill VW Jr. Toxicol Ind Health 12:507-513; NHANES III=The Third National Health and Nutrition Examination Survey, conducted by the National Center for Health Statistics, Centers for Disease Control and Prevention, Atlanta, GA; NTP=National Toxicology Program; Paschal et al. 1998=Paschal DC, Ting BC, Morrow JC, et al. Environ Res, Section A 76: 53-59; PBPK modeling=physiologically based pharmacokinetic modeling; Toxicological profile=ATSDR's toxicological profiles for the agency's priority hazardous substances.

Not a priority data need.

Table 2.—Groups Addressing ATSDR's Substance-Specific Priority Data Needs (PDNs)

ATSDR program

Firm, institution, agency, or consortium

Substance

PDN ID

Voluntarism

American Chemistry Council

Vinyl Chloride

35B, 35E

General Electric Company

PCBs

29G,* 29H,* 29I*

Halogenated Solvents Industry Alliance, Inc

Methylene chloride

Tetrachloroethylene

Trichloroethylene

26A, 26B

31B, 31C,

31D, 31E

34B, 34C,

34D, 34E,

34F

Minority Health Professions Foundation Schools

Florida A & M University

Lead

22A

The King/Drew Medical Center of the Charles R. Drew University of Medicine and Science

Lead

22B, 22C

Meharry Medical College

PAHS

28A, 28B, 28C, 28D

Morehouse School of Medicine

Lead

22C

Texas Southern University

Di-n-butyl phthalate

Lead

Toluene

Trichloroethylene

15D

22A

32C

34C

Tuskegee University

Chlordane

Mercury

Zinc

24A

36A, 36B

Xavier University

Manganese

Zinc

23A, 23B

36A

Great Lakes Human Health Effects Research Program

Michigan State University

DDT/DDE

Lead

Mercury

PCBs

Selenium

13D, 13E

22C

24D

29D, 29E, 29I

30D

New York State Health Department

DDT/DDE

Lead

Mercury

PCBs

13E

22C

24D

29D, 29E, 29I

State University of New York at Buffalo

DDT/DDE

Lead

Mercury

PCBs

13D, 13E

22C

24D

29D, 29E, 291

State University of New York at Oswego

DDT/DDE

Lead

Mercury

PCBs

13D, 13E

22C

24D

29D, 29E, 29I

University of Illinois at Chicago

DDT/DDE

Lead

Mercury

PCBs

13D, 13E

22C

24D

29D, 29E, 291

University of Illinois at Urbana-Champaign

DDT/DDE

Lead

Mercury

PCBs

13D, 13E

22C

24D

29D, 29E, 29I

University of Wisconsin—Milwaukee

DDT/DDE

Lead

Mercury

PCBs

13D, 13E

22C

24D

29A, 29D, 29E, 29I

Selenium

30D

Wisconsin Department of Health and Social Services—5 State Consortium

Arsenic

Cadmium

Chromium

DDT/DDE

10E

13D, 13E

Lead

Mercury

Nickel

PAHs

22C

24D

27F

28F

PCBs

29D, 29E, 29I

Environmental Protection Agency TSCA/FIFRA

ATSDR Test Rule

Benzene

Chloroethane

3A, 3B, 3C

8A, 8B

Cyanide (hydrogen cyanide and sodium cyanide)

11A, 11B

Methylene chloride

Tetrachloroethylene

Toluene

Trichloroethylene

26A, 26B

31C, 31D, 31E

32A, 32C

34B, 34C, 34D, 34F

Metals Testing Task Force (TASARC)

Arsenic

Beryllium

Chromium

Manganese

2A, 2B, 2C

4A, 4B, 4C, 4E

10A, 10B, 10C, 10D

23A, 23B, 23E

Mercury

Nickel

Selenium

24B, 24C

27B, 27C, 27D, 27E

30A, 30B

National Toxicology Program

National Institute of Environmental Health Sciences

Carbon Tetrachloride

Chlordane

Di-n-butyl phthalate

Endrin

Heptachlor

15A

18B

19B

* Not priority data needs.

[FR Doc. 02-2421 Filed 1-30-02; 8:45 am]

BILLING CODE 4163-70-P

This is a copy of a public record, reproduced as it was published. It is not legal advice, and it may not be the version a court would rely on. Check the official source before you cite it.