ML22012A067

Advisory Committee on the Medical Uses of Isotopes (ACMUI) Subcommittee on Radionuclide Generator Knowledge and Practice Requirements, Draft Report, September 8, 2021

ML22012A067
Person / Time
Issue date:	09/08/2021
From:	Office of Nuclear Material Safety and Safeguards
To:
Valentin-Rodriguez, C
References
Download: ML22012A067 (3)

Text

U.S Nuclear Regulatory Commission Advisory Committee on the Medical Uses of Isotopes

Subcommittee on Radionuclide Generator Knowledge and Practice Requirements

Draft Report Submitted on September 8, 2021

Subcommittee Members:

Vasken Dilsizian, M.D.

Richard Green (Chair)

Melissa Martin Megan Shober Harvey Wolkov, M.D.

NRC Staff Resource: Maryann Ayoade

Subcommittee Charge:

• To review and evaluate the knowledge and practice requirements for eluting, measuring and testing, and processing the eluate from radionuclide generator systems based on the evolution of radionuclide generator distribution.

• To evaluate and determine the appropriateness of the requireme nts and how best to obtain the required knowledge and practice.

• To evaluate whether and how additional knowledge and practice should be obtained as necessary to supervise the use of any radionuclide generator sy stem.

• Provide considerations and recommendations to staff.

Background:

In 1994, the NRC amended its commercial distribution of radioac tive drugs and medical use regulations in 10 CFR Parts 32 and 35, in part, to allow proper ly qualified nuclear pharmacists and authorized users who are physicians with greater discretion in preparing radioactive drugs containing byproduct material for medical use. The rule, Prep aration, Transfer for Commercial Distribution, and Use of Byproduct Material for Medical Use, r esulted in the language presently found in 10 CFR 35.290, Training for imaging and localization studies. Specifically, 10 CFR 35.290(c)(1)(ii)(G) relative to generators reads:

(G) Eluting generator systems appropriate for preparation of radioactive drugs for imaging and localization studies, measuring and testing the eluate for radionuclidic purity, and processing the eluate with reagent kits to prepare labeled radioactive drugs;

Over the last 27 years, the types of radionuclide generators us ed in clinical nuclear medicine practice, the location where they are housed and used, and the individuals who handle them have all significantly changed.

Molybdenum-99/Technetium-99m (99Mo/99mTc) generators

Prior to 1972, 99Mo/99mTc generators were ubiquitous and were found in every clinical nuclear medicine facility. The first cent ralized radiopharmacy (CRP) opened in 1972 and today there are approximately 300 centralized radiopharmacies in the United Sta tes. Over the course of time, the locations of most 99Mo/99mTc generators migrated from hospital nuclear medicine departmen ts to CRPs as nuclear medicine facilities converted to patient ready unit doses and utilized the services of CRPs for the provision of radiopharmaceuticals. Today approximately 95% of all radiopharmaceuticals used in the United States originate from a CRP. As a result of the consolidation of activities, there are fewer 99Mo/99mTc generators in use today than were used in the past. It is estimated that the United States utilizes appr oximately 720 new 99Mo/99mTc generators weekly, with 90% of them (~660) delivered to CRPs fo r use under the direction of an authorized nuclear pharmacist (ANP) and 10% of them (~60) deliv ered to hospital facilities for use under the direction of an authorized user (AU) physician or loc al ANP.

Strontium-82/Rubidium-82 (82Sr/82Rb) generators

Because of the 75 second half-life of 82RbCl2 used for PET myocardial perfusion imaging, all 82Rb generators are in clinical nuclear medicine facilities for use under the direction of an AU physician.

Germanium-68/Gallium-68 (68Ge/68Ga) generators

It is estimated that currently in the United States, approximat ely 70% of 68Ge/68Ga generators are delivered to CRPs for use under the direction of an ANP and 30% are delivered to hospital facilities for use under the direction of an AU physician.

The evolution of where radionuclide generators are located has presented challenges for fellows-in-training in residency programs. Many residency programs had made arrangements with commercial radiopharmacies for their fellows-in-training to att end generator training but due to COVID-19 these radiopharmacies have restricted access to their facilities. This increased the knowledge and practice burden affecting fellows-in-training who were unable to attend commercial radiopharmacies to receive generator training due to COVID-19 closures of these facilities.

In June 2020, several professional societies (American Society of Nuclear Cardiology, Society of Nuclear Medicine and Molecular Imaging, American College of Rad iology, and the American Society for Radiation Oncology) united to request that the U.S. Nuclear Regulatory Commission (NRC) consider Title 10 of the Code of Federal Regul ations (10 CFR) 35.290(c)(1)(ii)(G), Training for Imaging and Localization Stu dies, as a potential area for regulatory relief during the Coronavirus Disease 2019 (COVID-19 ) Public Health Emergency (PHE). This letter states that most of the commercial radiopha rmacies that supply portions of this training are closed to visiting trainees because of the CO VID-19 PHE and may not reopen for the foreseeable future. This letter further states that the y believe that this experience requirement can be satisfied virtually, via demonstrative educa tional webinars during the duration of the public health emergency. (Agencywide Documents Access and Management System [ADAMS] Accession No. ML20231A931).

Discussion:

The Subcommittee deliberated the intent of the existing Rule la nguage, the knowledge elements necessary for authorized user physicians to possess with regard to generator systems, and various methods of acquiring knowledge of these elements. The S ubcommittee recognizes the authorized user physicians role, as described in 10 CFR 35.27, supervising nuclear medicine technologists who may be operating generator systems at clinica l sites. Consequently, the Subcommittee believes that authorized users, whether or not the y personally use radionuclide generators, must be familiar with how generators work, how brea kthrough is tested, and how reagent kits are used to label radioactive drugs. The Subcommit tee also believes that it is not necessary for authorized user physicians to have direct hands-o n work experience with the generators, although the Subcommittee recognizes that direct wo rk experience is an excellent way to fulfill the training requirements.

In order to facilitate learning, and to provide training progra ms flexibility to deliver training, the Subcommittee discussed the strengths and limitations of in-pers on, pre-recorded, or live virtual training opportunities. The Subcommittee believes that training can incorporate any combination of these methods, but the Subcommittee believes it is essential for the training to include an opportunity for physicians to ask questions about the subject m aterial and receive answers in real time. In addition, it is important for the trainer to be able t o assess physician learning as the training is progressing. If pre-recorded material is used to de liver a portion of the training, there should also be a live component (whether in-person or via virtu al meeting) where trainees and trainers can directly interact.

Consistent with existing regulation, the Subcommittee further b elieves that it is not necessary to mandate training on every radionuclide generator system. Training programs should have t he flexibility to modify the training curriculum as the use of gen erator systems evolves.

Conclusion - Subcommittee Recommendation:

Current rule language in 10 CFR 35.290(c)(1)(ii)(G):

(G) Eluting generator systems appropriate for preparation of radioactive drugs for imaging and localization studies, measuring and testing the eluate for radionuclidic purity, and processing the eluate with reagent kits to prepare labeled radioactive drugs;

Subcommittee proposed revision:

(G) Participating in educational sessions to gain knowledge and provide supervision of -

(1) radionuclide generator systems and their operation; (2) the measurement of radionuclidic impurities and acceptable limits; and (3) the use of reagent kits with radionuclide eluate to prepare radioactive drugs.

Respectfully Submitted on September 8, 2021 Radionuclide Generator Knowledge and Practice Requirements Subc ommittee Advisory Committee on the Medical Uses of Isotopes (ACMUI)

U.S. Nuclear Regulatory Commission (NRC)