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Use of 55 PET radiotracers under approval of a Radioactive Drug Research Committee (RDRC)

EJNMMI Radiopharmacy and Chemistry volume 5, Article number: 24 (2020) Cite this article

Abstract

Background

In the US, EU and elsewhere, basic clinical research studies with positron emission tomography (PET) radiotracers that are generally recognized as safe and effective (GRASE) can often be conducted under institutional approval. For example, in the United States, such research is conducted under the oversight of a Radioactive Drug Research Committee (RDRC) as long as certain requirements are met. Firstly, the research must be for basic science and cannot be intended for immediate therapeutic or diagnostic purposes, or to determine the safety and effectiveness of the PET radiotracer. Secondly, the PET radiotracer must be generally recognized as safe and effective. Specifically, the mass dose to be administered must not cause any clinically detectable pharmacological effect in humans, and the radiation dose to be administered must be the smallest dose practical to perform the study and not exceed regulatory dose limits within a 1-year period. In our experience, the main barrier to using a PET radiotracer under RDRC approval is accessing the required information about mass and radioactive dosing.

Results

The University of Michigan (UM) has a long history of using PET radiotracers in clinical research studies. Herein we provide dosing information for 55 radiotracers that will enable other PET Centers to use them under the approval of their own RDRC committees.

Conclusions

The data provided herein will streamline future RDRC approval, and facilitate further basic science investigation of 55 PET radiotracers that target functionally relevant biomarkers in high impact disease states.

Background

Human use of positron emission tomography (PET) radiotracers in a given country (or member states in the case of the European Union) is required to be conducted under appropriate governmental oversight (Schwarz and Decristoforo 2019; Schwarz et al. 2019). In this paper, we focus upon clinical use of PET radiotracers in the United States, which is regulated by the Food and Drug Administration (FDA) (VanBrocklin 2008; Harapanhalli 2010; Schwarz et al. 2014). However, we expect the regulatory concepts described herein to also hold true in other locations, particularly in light of recent efforts to harmonize PET regulations around the world (Schwarz et al. 2019).

In the US, clinical use of PET radiotracers is conducted under the umbrella of an FDA-approved New Drug Application (NDA) or, in the case of generic PET radiotracers, an Abbreviated New Drug Application (ANDA). Human research is also conducted under governance of the FDA, via three major pathways: i) the Investigational New Drug application (IND), ii) an exploratory IND (eIND), or iii) under the oversight of a Radioactive Drug Research Committee (RDRC) (Suleiman et al. 2006; FDA Guidance for Industry and Researchers: The Radioactive Drug Research Committee: Human Research without an Investigational New Drug Application 2010; Carpenter Jr et al. 2009; Mosessian et al. 2014). The necessary path to approval is dictated by parameters outlined below, as well as the stated purpose of the research in question (Fig. 1).

Fig. 1
figure 1

Regulatory Oversight for PET Drugs in the United States

Full size image

While the IND and eIND represent the most common pathways to FDA approval for first-in-man studies, some of the requirements (e.g., costly toxicology in two species for an IND) represent significant hurdles to overcome in the application process. One notable solution, as described by Mosessian et al., is to divide labor and preparation for different components of the application between different cores and facilities at a given institution (Mosessian et al. 2014). In contrast, conducting human PET research under RDRC oversight represents a relatively efficient and cost effective path to FDA approval. The concept of the RDRC was introduced in 1975, and committees are charged by the FDA with the responsibility of overseeing PET research at the institutional level. RDRC committees are comprised of at least 5 members and are required to include people with the following expertise:

  • Physicians specializing in nuclear medicine;

  • Nuclear pharmacists and/or radiochemists that are trained and qualified to formulate radioactive drugs;

  • Persons having training in radiation safety and radiation dosimetry;

  • Individuals specializing in disciplines pertinent to nuclear medicine (radiology, internal medicine, hematology, endocrinology, radiation therapy, clinical pharmacology, etc.).

In order for a given PET imaging study to be conducted under RDRC approval, the proposed research must meet the following criteria (as described comprehensively in 21 CFR 361.1):

  • Stated purpose of the research must fall under the category of basic science, including but not limited to studies of: metabolism, kinetics, biodistribution, pathophysiology, biochemistry, transporter processes, and receptor binding/occupancy.

  • The research cannot be intended for immediate therapeutic or diagnostic purposes, or to determine the safety and effectiveness of the PET radiotracer, but can have therapeutic/diagnostic implications. If at any point research initiated under RDRC approval shifts to directly address these subjects, IND approval must be obtained prior to further studies.

  • The protocol must involve less than 30 patients, of age 18 or older (exceptions possible pending special approval), and women of child bearing potential must provide a written statement that they are not pregnant (without exception).

  • The PET radiotracer is generally recognized as safe and effective (GRASE). Specifically:

    • â—¦ The mass dose to be administered must not cause any clinically detectable pharmacological effect in humans. It is important to note that this generally precludes first-in-human testing of a PET radiotracer from being done under RDRC approval. Notably, RDRC approval can be used for study of radiolabeled endogenous molecules, as well as isotopic substitutions on clinically characterized compounds (i.e; substituting 18F for 19F on a small molecule ligand that has previously been approved and studied by the FDA, often via IND)

    • â—¦ The radiation dose to be administered must be the smallest dose practical to perform a given study. Specifically, the radiation dose to an adult research subject from a single study, or cumulatively from a number of studies, conducted within 1 year may not exceed established regulatory dose limits:

      1. (a)

        Whole Body / Active Blood-Forming Organs / Lens of Eye / Gonads: Single Dose (Effective Dose) = 3 rem (0.03 Sv), Annual & Total Effective Dose Commitment = 5 rem (0.05 Sv);

      2. (b)

        Other Organs: Single Dose = 5 rem (0.05 Sv); Annual and Total Dose Commitment = 15 rem (0.15 Sv).

      The radiation dose to a subject consists of the sum total of all sources of radiation associated with the research protocol, including the PET radiotracer(s), associated x-ray procedures (including CT scans, PET transmission scans etc.) and any follow-up studies.

    • â—¦ For research subject under 18 years of age at his or her last birthday, the RDRC regulations require that the radiation limits do not exceed 10% of the radiation dose values given above.

  • Other key criteria as described in 21 CFR 361.1 include providing evidence of: Qualified investigators, high quality of drug, research protocol, appropriate licensure to handle radioactive material, and review/approval for work with human subjects (via the Institutional Review Board (IRB)).

If all of these criteria are met, then the research can proceed following RDRC and IRB approval. Research conducted in RDRC studies is considered basic science. Specifically, basic science research is intended to advance scientific knowledge, but not to evaluate safety or efficacy of a PET radiotracer or to make clinical decisions. Failure to meet this, or any of the other RDRC criteria outlined above, necessitates that the research be conducted under an IND or eIND application that has been approved by the U.S. Food and Drug Administration (FDA), as outlined in 21 CFR 312 (Mosessian et al. 2014).

To ensure compliance with the pertinent regulations, FDA vests RDRC committees with oversight responsibility for basic science research conducted at the committee’s institution. The committee reviews and approves research protocols to ensure compliance with RDRC regulations, and submits annual reports to FDA that list committee members and summarize all studies conducted under the committee’s approval in the preceding year. The RDRC committee must also submit a special summary (Form FDA 2915) for any approved study involving > 30 research subjects (Suleiman et al. 2006).

Conducting human PET imaging under RDRC approval represents a straightforward and economical pathway to clinical use, particularly since there is no requirement for resource intensive pharmacology-toxicology studies. In our experience, the main barrier to using a PET radiotracer for basic science under RDRC approval is actually accessing the required information about pharmacological dose/mass and radioactive dose. For a given radiotracer this information can either come from the peer-reviewed scientific literature or other valid data, often in the form of a signed letter from an institution already working with the radiotracer in question. In an effort to remove barriers to those wishing to conduct clinical PET research under RDRC, herein we provide pharmacological dose and radioactive dosimetry details for 55 such PET radiotracers that will enable other PET Centers to use them under the approval of their own RDRC committees, eliminating the need to obtain a specific signed letter on a case-by-case basis. The article is made available Open Access in an attempt to further improve accessibility for our imaging colleagues, and we encourage other PET Centers with large clinical radiotracer portfolios to publish sister articles in the near future.

Methods

Radiosyntheses

PET radiotracers were commercially available, or synthesized according to the literature radiosyntheses referenced in Table 1 or novel radiosyntheses described in the Supporting Information. Production and quality control of all radiotracers was conducted according to current Good Manufacturing Practice (cGMP) using the guidelines outlined in the US Pharmacopeia, (USP < 823> Positron Emission Tomography Drugs for Compounding, Investigational, and Research Uses 2020).

Table 1 Radiotracers used clinically at the University of Michigan
Full size table

Dosimetry

Radiation-absorbed-dose estimates can either be obtained from literature sources or determined using the OLINDA/EXM 1.0 software package (Stabin et al. 2005). Table 1 provides literature sources of dosimetry wherever available. For any radiotracers where literature dosimetry is unavailable, dosimetry is provided in the Supporting Information.

Imaging

Research PET scans have been conducted since the first PET scanner was installed at the University of Michigan (UM) in the 1980s. Historical examples of imaging studies mostly conducted at our Center with the various radiotracers are provided in Table 1, including practical information on both scanning protocols and image kinetic analysis. Injected dose (MBq), mass dose limits (μg) and historical numbers of subjects scanned are provided in Table 2.

Table 2 Dosing information
Full size table

Discussion

At the University of Michigan we have a long history of using PET radiotracers in clinical research studies (using both the RDRC and IND mechanisms). Detailed information for 55 such radiotracers is provided in Table 1, including references for radiosyntheses and dosimetry available in the peer-reviewed literature. Synthesis ([11C]butanol, [18F]ASEM, [18F]FDOPA, [68Ga]PSMA-11) and dosimetry ([18F]ASEM, [11C]butanol, [11C]HED, [11C]LY2795050, [11C]MPH, [18F]MPPF, [11C]PMP, [11C]RO-54864) information that has not previously been published is provided in the Supporting Information associated with this article. Pharmacological dose and radioactivity dosing information for the PET drugs is also provided (Table 2), along with historical numbers of administrations to subjects at the University of Michigan PET Center. Rationale for those radiotracers without mass dose limits is provided in the Supporting Information.

As noted above, a study conducted under RDRC oversight cannot exceed 30 subjects without special provisions. The PET drugs corresponding to some of the larger numbers of subjects discussed herein have been used in numerous different RDRC studies over the course of many years (and decades in some instances). In the event any given study exceeded 30 research subjects, the RDRC committee filed a special summary (Form FDA 2915). At the doses specified, no pharmacological or physiological changes were observed after intravenous administration of any of the PET drugs, and the basic science studies were conducted without exceeding any regulatory radiation dose limits. All scans have been reported to the US FDA in the annual RDRC reports required by the agency.

Conclusion

While an IND (or eIND) is the dominant route to FDA approval for first-in-man studies, collection of the requisite data and preparation of the application can be a daunting and resource intensive task. Proceeding under approval of a Radioactive Drug Research Committee therefore represents an attractive mechanism for clinical studies of compounds that have (a) already been studied in man and (b) are well characterized in terms of pharmacology and dosimetry. Initiation of a new study for such an established compound is contingent upon access to mass dose and dosimetry data. The data provided herein will streamline future RDRC approval, and facilitate further basic science investigation of 55 PET drugs that target functionally relevant biomarkers in high impact disease states.

Availability of data and materials

The datasets used in the current paper are available from the corresponding author on reasonable request.

Abbreviations

ANDA:

Abbreviated new drug application

Bq:

Becquerels

cGMP:

Current good manufacturing practice

eIND:

Exploratory IND

FDA:

Food and Drug Administration

IND:

Investigational new drug

NDA:

New drug application

PET:

Positron emission tomography

QC:

Quality control

RDRC:

Radioactive drug research committee

USP:

United States Pharmacopeia

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Acknowledgments

We thank Prof. James Carey for calculating historical dosimetry data and Mr. Phillip Sherman for generating biodistribution data, as well as the many learners, staff, technologists and both basic science and clinical faculty who have contributed to the synthesis, quality control and clinical translation of PET drugs at the University of Michigan over the years. Assistance in making [11C]PBR28 available for use under RDRC from Prof. Robert Innis (NIMH) is gratefully acknowledged. Lastly, we thank Prof. Nabeel Nabulsi, Prof. Richard Carson and their colleagues at the Yale PET Center for help in making [11C]LY2795050 and [18F]ASEM available for RDRC use at UM, and for generously allowing inclusion of their dosimetry for both radiotracers in the Supporting Information.

Funding

A fee waiver from EJNMMI Radiopharmacy and Chemistry to make this article available Open Access is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Radiology, University of Michigan, 2276 Medical Science Bldg I, SPC 5610, Ann Arbor, MI, 48109, USA

    Isaac M. Jackson, So Jeong Lee, Alexandra R. Sowa, Melissa E. Rodnick, Laura Bruton, Mara Clark, Sean Preshlock, Jill Rothley, Virginia E. Rogers, Leslie E. Botti, Bradford D. Henderson, Brian G. Hockley, Jovany Torres, David M. Raffel, Allen F. Brooks, Kirk A. Frey, Michael R. Kilbourn, Robert A. Koeppe, Xia Shao & Peter J. H. Scott

  2. Present Address: Stanford University, Stanford, CA, USA

    Isaac M. Jackson

  3. Present Address: Gordon Center for Medical Imaging, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA

    So Jeong Lee

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Contributions

IMJ and PJHS analyzed data and wrote the manuscript. SJL, ARS, JT, XS, MER, LB, MC, SP and AFB conducted radiosyntheses. VER maintains historical PET records and databases. JR is the lead PET technologist who coordinated scheduling and clinical dosing. BGH, BDH, MC and JT provided quality control and/or quality assurance for PET drug manufacture. LEB coordinated RDRC/IRB submissions. DMR calculated dosimetry. KAF, RAK, MRK and PJHS have supervision responsibility. KAF is Chief of Nuclear Medicine and the authorized user physician. The author(s) read and approved the final manuscript.

Corresponding author

Correspondence to Peter J. H. Scott.

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This article does not contain any original studies with human or animal subjects performed by any of the authors.

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The authors declare no competing financial interests.

Additional information

This article is dedicated to Capt. Richard Fejka, MS, RPh, BCNP, USPHS (Ret.) on the occasion of his retirement after 39 years of government service and 17 years overseeing the RDRC Program at the U.S. Food and Drug Administration.

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Jackson, I.M., Lee, S.J., Sowa, A.R. et al. Use of 55 PET radiotracers under approval of a Radioactive Drug Research Committee (RDRC). EJNMMI radiopharm. chem. 5, 24 (2020). https://doi.org/10.1186/s41181-020-00110-z

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