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RAC Oversight of Gene Transfer Research: A Model Worth Extending?

Published online by Cambridge University Press:  01 January 2021

Extract

Clinical gene transfer research (GTR) has both a unique history and a complex and layered system of research oversight, featuring a unique review body, the Recombinant DNA Advisory Committee (RAC). This paper briefly describes the process of decision-making about clinical GTR, considers whether the questions, problems, and issues raised in clinical GTR are unique, and concludes by examining whether the RAC's oversight is a useful model that should be reproduced for other similar areas of clinical research.

Clinical GTR is governed by the same oversight system as most clinical trials, with a significant addition: the RAC. Like other research with human subjects, GTR, if it is affiliated with a federally funded institution, must be approved by an institutional review board (IRB) whose activities are governed by the common rule, that is, the federal regulations for protection of human subjects in research. Like other research intended to produce a drug, device, or biologic to be marketed in the United States, GTR is also overseen by the Food and Drug Administration (FDA).

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Article
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Copyright © American Society of Law, Medicine and Ethics 2002

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References

The acronym also serves as a homonym for an instrument of medieval torture, a meaning that is wryly invoked both by investigators and sponsors who appear before it and by members after long meetings.Google Scholar
Others have also addressed the question whether the Recombinant DNA Advisory Committe (RAC) oversight model, or aspects of it, should be more broadly applied. See, e.g., Walters, L., “The Oversight of Gene Transfer Research,” Kennedy Institute of Ethics Journal, 10 (2000): 171–74;.Google Scholar
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The consolidated and harmonized Common Rule was published at 56 Fed. Reg. 28,012 (June 18, 1991); the codification most familiar to institutional review boards (IRBs) and others involved in research oversight are the Department of Health and Human Services regulations at 45 C.F.R. Part 46 (2001).Google Scholar
The Food and Drug Administration (FDA) regulations corresponding to the Common Rule appear at 21 C.F.R. Parts 50 and 56. Key FDA drug development regulations are also found at Parts 312, 314, and elsewhere. The FDA's human subjects regulations are substantially similar to the Common Rule, but in addition, the FDA has a very hands-on relationship with research sponsors in the long process of drug development. See, e.g., the overview provided in N. Plant, “Adequate Well-Controlled Clinical Trials: Reopening the Black Box,” Widener Law Symposium Journal, 1 (1996): 267–97.Google Scholar
Clinical gene transfer research (GTR) may also be subject to additional local review in several forms. If it is cancer research (as most of it is), there may be a local oncology protocol review committee. If there is a general clinical research center affiliated with the institution at which the research will take place, the general clinical research center's review committee must also review the research, if any part of it will take place in the general clinical research center. And some institutions have established their own human gene transfer review committees.Google Scholar
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The Office of Biotechnology Activities (OBA) is the NIH office that staffs the RAC. It was formerly called the Office of Recombinant DNA Activities; in recent years it has been expanded and also staffs two other federal advisory committees, on xenotransplantation and genetic testing.Google Scholar
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That is, it functions something like a single IRB established to provide overarching guidance to local IRBs for a multicenter study. In this respect, RAC is a kind of precursor to the current interest in centralizing some aspects of the oversight of multicenter trials.Google Scholar
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Promise has been shown to date in several hemophilia studies (see, e.g., Stephenson, J., “Gene Therapy Trials Show Clinical Efficacy,” journal of the American Medical Association, 283 (2000): 589–90) in recent studies of infants and young children with one form of severe combined immunodeficiency (Hacein-Bey-Abina, S. et al. , “Sustained Correction of X-Linked Severe Combined Immunodeficiency by ex Vivo Gene Therapy” N. Engl. J. Med., 346 (2002): 1185–93); and in a few studies of squamous cell carcinoma of the head and neck (the only GTR that has as yet reached Phase III trials).Google Scholar
I have of course borrowed this phrase from Alan Greenspan, who used it in a very different context. The terms more commonly used to describe the degree of excitement about GTR are somewhat more pointed, like “hype”. See, e.g., Marshall, E., “Less Hype, More Biology Needed for Gene Therapy,” Science, 270 (1995): 1751–52 See also Churchill, L.R. et al. , “Genetic Research as Therapy: Implications of ‘Gene Therapy’ for Informed Consent,” Journal of Law, Medicine & Ethics, 26, no. 1 (1998): 3847.Google Scholar
In GTR, genes are introduced into subjects in a variety of ways. Each means of introduction needs a precise and consistent standard for measuring and reporting the amount of genetic material, in order to control dosing and quantify outcomes. Most GTR uses delivery vectors to introduce the genetic material, though some studies use naked DNA. Vectors can be made of altered viruses or of other materials, like fat particles. Each vector used in GTR therefore needs to be individually standardized. Because most vectors are viral, there are so many in use, and each is so different, this standardization is a considerable undertaking.Google Scholar
See discussions of vector standardization guidelines for retroviruses and adenoviruses in RAC meeting minutes, December 2000, at <http://www4.od.nih.gov/oba/RAC/meeting.html> (last visited September 17, 2002). The National Gene Vector Laboratories are instrumental in developing standards, at <www.ngvl.org> (last visited September 17, 2002).+(last+visited+September+17,+2002).+The+National+Gene+Vector+Laboratories+are+instrumental+in+developing+standards,+at++(last+visited+September+17,+2002).>Google Scholar
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Id. at comments of Dr.Pilaro, Anne, FDA, in RAC meeting minutes, December 1999.Google Scholar
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Sources of concern range from the original Asilomar moratorium on recombinant DNA research to discussions of germ-line interventions, both deliberate and inadvertent. See, e.g., the many sources cited in the Human Gene Therapy Scope Note, supra note 10.Google Scholar
Possible explanations for this shift are structural, financial, scientific, and social. Cancer is a problem that affects many people and is high in public consciousness. The apparatus of oncology research is large, prominent, and experienced in attracting research funding and managing clinical trials. And burgeoning knowledge in areas relating to cancer control mechanisms, such as the role of the immune system and of various genetic mutations, has helped lead to many forms of GTR in cancer: Gene-based vaccines, the introduction into tumors of genes that can be killed by antiviral agents, and studies using tumor suppressor genes are just a few examples. As of May 31, 2002.Google Scholar
there were 332 cancer trials in OBA's database, out of 480 total clinical trials of interventions considered potentially therapeutic. This total excludes marking studies and studies using healthy normal subjects. If all human studies are included, the percentage of cancer studies is about 63 percent of the total; data at <http://www4.od.nih.gov/oba/rac/documents1.htm> (last visited September 17, 2002) (enumerated in the last two pages of the Protocol List). (last visited September 17, 2002) (enumerated in the last two pages of the Protocol List).' href=https://scholar.google.com/scholar?q=there+were+332+cancer+trials+in+OBA's+database,+out+of+480+total+clinical+trials+of+interventions+considered+potentially+therapeutic.+This+total+excludes+marking+studies+and+studies+using+healthy+normal+subjects.+If+all+human+studies+are+included,+the+percentage+of+cancer+studies+is+about+63+percent+of+the+total;+data+at++(last+visited+September+17,+2002)+(enumerated+in+the+last+two+pages+of+the+Protocol+List).>Google Scholar
The National Cancer Institute's informational website on oncology research is very comprehensive, at <http://www.cancer.gov/clinical_trials/> (last visited September 17, 2002) For some insight into the perspective of oncology research, see Miller, M., “Phase I Cancer Trials: A Collusion of Misunderstanding,” Hastings Center Report, 30, no. 4 (2000): 3443. (last visited September 17, 2002) For some insight into the perspective of oncology research, see Miller, M., “Phase I Cancer Trials: A Collusion of Misunderstanding,” Hastings Center Report, 30, no. 4 (2000): 34–43.' href=https://scholar.google.com/scholar?q=The+National+Cancer+Institute's+informational+website+on+oncology+research+is+very+comprehensive,+at++(last+visited+September+17,+2002)+For+some+insight+into+the+perspective+of+oncology+research,+see+Miller,+M.,+“Phase+I+Cancer+Trials:+A+Collusion+of+Misunderstanding,”+Hastings+Center+Report,+30,+no.+4+(2000):+34–43.>Google Scholar
Focusing GTR on monogenic diseases could be viewed as a vital component of the ongoing effort to develop effective interventions for patients with orphan diseases. Moving GTR to more common diseases and disorders with multifactorial causes, like cancer, HIV infection, coronary artery disease, or diabetes clearly makes a promising technology more widely available. At the same time, however, it does two additional things: It greatly increases the investment of money and research infrastructure for GTR; and it helps to focus public and policymaking attention on research involving expensive, cutting-edge technologies as a primary solution for problems that can also be addressed by attention to prevention, public and environmental health and health education, lifestyle, and the complex relationships among genes, environment, and expression.Google Scholar
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Dr.Wilson, James, then-director of the University of Pennsylvania's Institute for Human Gene Therapy, where the ornithine transcarbamylase deficiency trial took place, and a co-investigator, had a financial interest in a company he founded, Genovo Inc.Google Scholar
which had a stake in the success of the trial's liver-directed gene transfer methodology, developed by his laboratory at Penn. See Nelson, D. Weiss, R., “Hasty Decisions in the Race to a Cure?,” Washington Post, Sunday, Nov. 1999; at A01, for a review of the potential financial conflicts of interest and how they were viewed before Mr. Gelsinger's death.Google Scholar
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Other entities, such as oncology protocol review committees, general clinical research centers, institutional biosafety committees, local human gene transfer committees, and review committees convened by sponsors, may have scientific but not ethical expertise, or may not be disposed to ask certain scientific questions.Google Scholar
Indeed, the three determinations are nothing more than my own phase I-specific gloss on the federal Common Rule's first two criteria for IRB approval of research, codified in Department of Health and Human Services regulations at 45 CFR 46.111(a), which addresses the IRB's overall responsibility to approve only research that minimizes risks and that demonstrates an appropriate balance between the risks of harm and the benefits from anticipated gains in knowledge.Google Scholar
For example, the nonexistence of a “knockout mouse” model, genetically altered to knock out a gene of interest and therefore mimic a particular human disorder, is not the same as the limitations of the information that can be gained from knockout mice about human disorders; nor is it the same as the knowledge that there is a knockout mouse available but that purchasing the right to use it from the patent holder is costly and will delay the start of a Phase I study in humans.Google Scholar
Choosing the right first subjects posed unexpected challenges in the ornithine transcarbamylase deficiency trial. At least three different possible subject populations were apparently discussed at various times: severely affected newborn infants currently in crisis from an excess of ammonia; severely affected but currently stable infants and young children awaiting liver transplant; and partially affected adults (usually men and women with a late onset form of the enzyme deficiency;Google Scholar
Mr.Gelsinger, , who had been diagnosed at 3 years of age, apparently had a spontaneous mutation rather than an inherited form of the disorder). One important consideration in choosing subjects is the ethical preference for first recruiting adults who can make their own decisions about research participation. This consideration is especially powerful in first human trials because of the extreme uncertainty about potential efficacy in an intervention as yet untested in humans, and because of the design and goals of Phase I trials: dose escalation studies designed to elicit and examine toxicities, beginning at low doses unlikely to provide benefit to subjects even if the intervention worked perfectly (which it usually doesn't). Added to this was the concern that the parents of newborns in hyperammonemic crisis would be emotionally and informationally stressed, having just learned of the disorder because their child was gravely ill from it, and being asked to decide quickly about an unprecedented but emergent intervention. Aside from decision-making and consent issues and regulatory limitations on research with children (45 C.F.R. Part 46 Subpart D), all of which favored recruitment of adult subjects first, minimizing harm to subjects appeared to favor enrollment of newborns in crisis, since gene transfer was believed to pose low risks of harm and since these newborns were already seriously ill and already receiving maximal but suboptimal therapy. (Moreover, investigators and regulators alike were greatly tempted to reason that if this gene transfer worked, these babies could be saved.) In contrast, maximizing generalizable knowledge favored recruitment of partially affected, currently stable subjects. It would be very hard to determine, in newborns in acute crisis, which of any effects seen, whether for good or ill, resulted from the disease, the standard treatments, or the experimental intervention.Google Scholar
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statement of Dr.Walters, LeRoy, supra note 8.Google Scholar
Most recently, in response to questions raised about GTR oversight after Mr. Gelsinger's death, the Acting Director of NIH convened a working group from the standing Advisory Committee to the Director to critically examine the RAC's role and functions.Google Scholar
See “Advisory Committee to the Director, Working Group on NIH Oversight of Clinical Gene Transfer Research, Enhancing the Protection of Human Subjects in Gene Transfer Research at the National Institutes of Health,” July 12, 2000, at <http://www.nih.gov/about/director/07122000.htm> (last visited September 17, 2002). After the Advisory Committee to the Director Working Group issued its report, the RAC received authorization to expand its membership from fifteen, to add new relevant expertise in areas such as public policy and statistics.+(last+visited+September+17,+2002).+After+the+Advisory+Committee+to+the+Director+Working+Group+issued+its+report,+the+RAC+received+authorization+to+expand+its+membership+from+fifteen,+to+add+new+relevant+expertise+in+areas+such+as+public+policy+and+statistics.>Google Scholar
This interview was conducted as one component of an Ethical, Legal, and Social Implications (ELSI) project, “The Social Construction of Benefit in Gene Transfer Research” (1 RO1 HG 02087–01, ELSI Program, National Human Genome Research Institute, NIH). Gail, E. Henderson and I are co-principal investigators, with co-investigators Larry, R. Churchill Arlene, M. Davis Daniel, K. Nelson Benjamin, S. Wilfond. The project also includes interviews with GTR investigators, study coordinators, and subjects, as well as review of nearly all consent forms and Points to Consider responses on file with OBA. Co-investigators Churchill, Nelson, and Wilfond conducted the IRB interviews between December 2000 and November 2001. The data presented here are preliminary results only.Google Scholar
Perhaps most common is some IRBs' reluctance to mention autopsy in the consent form, though Appendix M requires investigators to include in the consent form the information that permission for an autopsy of the subject will be requested from the next of kin at the time of the subject's death for any reason, in order to learn more about the long-term effects of GTR. Appendix M's discussion of autopsy requests thus addresses most IRBs' concerns, which include failure to appreciate the need for the information, worry that mentioning death might unduly alarm sick subjects, and fear that an autopsy request might be mistaken for an autopsy requirement; yet unless they read Appendix M, IRBs cannot discern this. Once the specific requirements that Appendix M places on investigators are drawn to the IRB's attention by OBA or the RAC, IRBs are, in my experience, very receptive to making suggested changes in consent forms.Google Scholar
Correspondence from OBA is sent to the principal investigator listed in OBA's files, and copied to the principal investigator's IRB. This means that in multicenter studies, the only IRB receiving correspondence is the IRB at the primary site — and even that IRB does not receive the attachments included in the letter to the principal investigator at the site. IRBs reviewing GTR thus must take additional steps in order to be most fully informed.Google Scholar
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It is important that IRBs reviewing GTR become accustomed to requesting copies of Appendix M responses — from the principal investigator, OBA, or the IBC. Closer relationships between IRBs and IBCs are desirable as well, because IBCs usually do know about Appendix M, and may routinely review Appendix M responses from principal investigators — but many are unaccustomed to reviewing clinical research, and could learn much from the IRB.Google Scholar
Between 20 and 30 percent of protocols are selected for full public review and discussion, and that percentage is dropping as the number of protocols submitted to OBA for RAC review continues to grow.Google Scholar
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66 Fed. Reg. 57970–7 (Nov. 19, 2001). Final Paperwork Reduction Act clearance for adverse event reporting harmonization was given in March 2002.Google Scholar
66 Fed. Reg. 57970–7 (Nov. 19, 2001). The Gene Transfer Safety Advisory Board (GTSAB) will have about fifteen members. Two will be members of the RAC.Google Scholar
Members of the NIH staff will be included, as well as a FDA liaison. The remaining members will be chosen for their relevant expertise (e.g., scientific, clinical, statistical, ethical); ad hoc members will be involved as needed. The GTSAB will meet quarterly in closed session, and will provide summary reports to the RAC and for publication.Google Scholar
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Churchill, et al. , supra note 20. As Churchill, et al. have noted, somatic cell GTR has long been held to raise no new questions — but that does not mean that there are no old questions; in fact, there are many.Google Scholar