Economic evaluation in the National Drug Abuse Treatment Clinical Trials Network: Past, present, and future

Optimizing retention strategies for opioid use disorder pharmacotherapy: The retention phase of the CTN-0100 trial (RDD)

INTRODUCTION AND BACKGROUND

The three medications approved to address OUD are effective in decreasing opioid use and morbidity and mortality; however, their utility is limited by high rates of dropout from treatment. The CTN-0100 trial will develop an evidence base for strategies to improve retention on buprenorphine and extended-release naltrexone.

RESEARCH DESIGN AND METHODS

The National Drug Abuse Treatment Clinical Trials Network (CTN) study CTN-0100, "Optimizing Retention, Duration and Discontinuation Strategies for Opioid Use Disorder Pharmacotherapy" (RDD), is a multicenter, randomized, non-blinded trial enrolling more than a thousand patients from 18 community-based substance use disorder treatment programs. Participants are adult volunteers seeking to initiate medication treatment for OUD (MOUD). Individuals choose between buprenorphine or extended-release injectable naltrexone. The trial randomizes participants choosing buprenorphine, in a 3 × 2 factorial design, to a medication condition (standard-dose sublingual buprenorphine, high-dose sublingual buprenorphine, or extended-release injectable buprenorphine) and to a behavioral condition (Medical Management or Medical Management plus a digital therapeutic (smartphone) app). Individuals choosing extended-release naltrexone are randomized only to a behavioral condition. Participants receive study medication for 74 weeks and are then followed for a further 24 weeks. The primary outcome is successful retention on MOUD at 26 weeks (six months), with 50- and 74-week retention among the secondary outcomes.

DISCUSSION/CONCLUSION

Dropout from treatment is a major barrier to the effectiveness of MOUD. The CTN-0100 study will determine whether strategies such as high dose sublingual or extended-release buprenorphine, or an app-based behavioral intervention improve retention on MOUD.

CLINICALTRIALS

gov Identifier: NCT04464980.

Cost-Effectiveness of Implementation Facilitation to Promote Emergency Department-Initiated Buprenorphine for Opioid Use Disorder

STUDY OBJECTIVE(S)

To evaluate the cost-effectiveness of implementation facilitation compared with a standard educational strategy to promote emergency department (ED)-initiated buprenorphine with linkage to ongoing opioid use disorder care in the community, from a health care-sector perspective.

METHODS

A prospective cost-effectiveness analysis was conducted alongside "Project ED Health" (CTN-0069), a hybrid type 3 implementation-effectiveness study conducted at 4 academic EDs. Resources were gathered and valued according to the health care-sector perspective. Three effectiveness measures were evaluated: quality-adjusted life-years, opioid-free years, and patient engagement in community-based opioid use disorder care on the 30th day following the index ED visit. An incremental cost-effectiveness ratio was calculated for each measure of effectiveness. Likelihood of cost-effectiveness was evaluated across a wide range of "value" thresholds through cost-effectiveness acceptability curves.

RESULTS

The mean, per-person, health care-sector cost associated with ED-administered buprenorphine following implementation facilitation did not differ significantly from that of standard education ($3,239 versus $4,904), whereas the mean effectiveness for all 3 measures significantly favored the implementation facilitation strategy. Implementation facilitation has a 74% to 75% probability of being considered cost-effective from a health care-sector perspective at the recommended value range of $100,000 to $200,000 per quality-adjusted life-year. Incremental cost-effectiveness ratios estimated using secondary effectiveness measures had a 75% probability of being considered cost-effective at $25,000 per opioid-free year and $38,000 per engagement.

CONCLUSION

Implementation facilitation, relative to a standard educational strategy, has a moderate-to-high likelihood of being considered cost-effective from a health care-sector perspective, depending on decisionmakers' willingness to pay for units of effectiveness.

Informing evidence-based medicine for opioid use disorder using pharmacoeconomic studies

INTRODUCTION

The health and economic consequences of inadequately treated opioid use disorder (OUD) are substantial. Healthcare systems in the United States (US) and other countries are facing a growing healthcare crisis due to opioids. Although effective medications for OUD exist, relying solely on clinical information is insufficient for addressing the opioid crisis.

AREAS COVERED

In this review, the role of pharmacoeconomic studies in informing evidence-based medication treatment for OUD is discussed, with a particular emphasis on the US healthcare system, where the economic burden is significantly higher than the global average. The scope/objective of pharmacoeconomics as a distinct scientific research program is briefly defined, followed by a discussion of existing evidence informed by data from systematic reviews, in addition to a convenience sample of recently published pharmacoeconomic studies and protocols. The review also explores the need for methodological advancements in the field.

EXPERT OPINION

Despite the potential of pharmacoeconomic research in shaping evidence-based medicine for OUD, significant challenges limiting its real-world application remain. How to address these challenges are explored, including how to combine cost-effectiveness and budget impact analyses to address the needs of the healthcare system as a whole and specific stakeholders interested in adopting new OUD treatment strategies.

PERSPECTIVE: Health Economic Interests at NIMH and NIDA to Improve Delivery of Behavioral Health Services

BACKGROUND

Effective financing mechanisms are essential to ensuring that people can access and utilize effective treatments and services. Financing mechanisms are needed not only to pay for the delivery of those treatments and services, but also ancillary costs, while also keeping care affordable.

AIMS

This article highlights key areas of the interest of the National Institute of Mental Health (NIMH) and the National Institute on Drug Abuse (NIDA) in supporting applied health economics and health care financing research. Specifically, this article discusses the long-range impact of NIH's earlier investments in applied health economics research, and NIH's ongoing efforts to communicate its interests in health economics research. We discuss the 2023 NIMH-NIDA-sponsored health economics conference, and the ideas presented there for developing and assessing innovative behavioral health care financing models; three of the presented papers were recently published in the Journal of Mental Health Policy and Economics.

METHODS

We describe the history and impact of NIMH- and NIDA-sponsored economic research and identify current research interests as identified in the NIMH and NIDA Strategic Plans and recent funding announcements. We examine themes presented at the NIMH-NIDA Health Economics conference. The conference included over 300 participants from 20 countries, from six continents.

RESULTS

The topics highlighted at the conference highlight the ways in which NIH-funded research has promoted the development of innovative health care financing methods, both from the supply side (e.g., providers and payers) and demand side (e.g., service users and families). Invited speakers discussed the findings from NIH-supported research in the topic areas of payment and financing, behavioral economics and social determinants of health. Keynote speakers highlighted emerging topics in the field, including the economics of health equity, biases in mental health models in health care, and value-based insurance design.

DISCUSSION

We demonstrate a resurgence of and explicit interest in health economics and policy research at NIMH and NIDA. However, more work is needed in order to design funding mechanisms that fully provide access to and facilitate use of effective evidence-based practices to improve mental health outcomes. For example, it is important that policy and health economic research projects include decision makers who will be the end users of data and study results, to ensure that results can be meaningfully put into practice.

IMPLICATIONS FOR HEALTH CARE

Designing effective and efficient funding mechanisms can help ensure that service users have access to effective treatments and that clinicians and provider organizations are adequately compensated for their work.

IMPLICATIONS FOR HEALTH POLICIES

Federal, state, and local policies, as well as policies of payers and health care organizations, can influence the type of care that is supported and incentivized.

IMPLICATIONS FOR FURTHER RESEARCH

As demonstrated by the research interests as outlined in their respective Strategic Plans and funding announcements, NIMH and NIDA continue to fund health economic and policy research that aims to improve health care access, quality and outcomes for people with or at risk of developing behavioral health conditions in the US and around the world.

A visual circuit related to the habenula mediates the prevention of cocaine relapse by bright light treatment

Despite significant advancements in our understanding of addiction at the neurobiological level, a highly effective extinction procedure for preventing relapse remains elusive. In this study, we report that bright light treatment (BLT) administered during cocaine withdrawal with extinction training prevents cocaine-driven reinstatement by acting through the thalamic-habenular pathway. We found that during cocaine withdrawal, the lateral habenula (LHb) was recruited, and inhibition of the LHb via BLT prevented cocaine-driven reinstatement. We also demonstrated that the effects of BLT were mediated by activating LHb-projecting neurons in the ventral lateral geniculate nucleus and intergeniculate leaflet (vLGN/IGL) or by inhibiting postsynaptic LHb neurons. Furthermore, BLT was found to improve aversive emotional states induced by drug withdrawal. Our findings suggest that BLT administered during the cocaine withdrawal may be a promising strategy for achieving drug abstinence.

Econometric Issues in Prospective Economic Evaluations Alongside Clinical Trials: Combining the Nonparametric Bootstrap With Methods That Address Missing Data

Prospective economic evaluations conducted alongside clinical trials have become an increasingly popular approach in evaluating the cost-effectiveness of a public health initiative or treatment intervention. These types of economic studies provide improved internal validity and accuracy of cost and effectiveness estimates of health interventions and, compared with simulation or decision-analytic models, have the advantage of jointly observing health and economics outcomes of trial participants. However, missing data due to incomplete response or patient attrition, and sampling uncertainty are common concerns in econometric analysis of clinical trials. Missing data are a particular problem for comparative effectiveness trials of substance use disorder interventions. Multiple imputation and inverse probability weighting are 2 widely recommended methods to address missing data bias, and the nonparametric bootstrap is recommended to address uncertainty in predicted mean cost and effectiveness between trial interventions. Although these methods have been studied extensively by themselves, little is known about how to appropriately combine them and about the potential pitfalls and advantages of different approaches. We provide a review of statistical methods used in 29 economic evaluations of substance use disorder intervention identified from 4 published systematic reviews and a targeted search of the literature. We evaluate how each study addressed missing data bias, whether the recommended nonparametric bootstrap was used, how these 2 methods were combined, and conclude with recommendations for future research.

Cost-effectiveness of extended-release injectable naltrexone among incarcerated persons with opioid use disorder before release from prison versus after release

INTRODUCTION

Opioid use disorder (OUD) is highly prevalent among incarcerated populations, and the risk of fatal overdose following release from prison is substantial. Despite efficacy, few correctional facilities provide evidence-based addiction treatment. Extended-release injectable naltrexone (XR-NTX) administered prior to release from incarceration may improve health and economic outcomes.

METHODS

We conducted an economic evaluation alongside a randomized controlled trial testing the effectiveness of XR-NTX before release from prison (n = 38) vs. XR-NTX referral after release (n = 48) of incarcerated participants with OUD, both groups continuing treatment at a community addiction treatment center. The incremental cost-effectiveness ratio (ICER) assessed the cost-effectiveness of XR-NTX before release compared to referral after release for three stakeholder perspectives at 12- and 24-week periods: state policymaker, health care sector, and societal. Effectiveness measures included quality-adjusted life-years (QALYs) and abstinent years from opioids. In addition, we categorized resources as OUD-related and non-OUD-related medical care, state transfer payments, and other societal costs (productivity, criminal justice resources, etc.).

RESULTS

Results showed an association between XR-NTX and greater OUD-related costs and total costs from the state policymaker perspective. QALYs gained were positive but statistically insignificant between arms; however, results showed XR-NTX had an estimated 15.5 more days of opioid abstinence over 24 weeks and statistically significant at a 95 % confidence level based on the distribution of bootstrapped samples. We found that estimated ICERs to be > $500,000 per QALY for all stakeholder perspectives. For the abstinent-year effectiveness measure, we found XR-NTX before release to be cost-effective at a 95 % confidence level for willingness-to-pay values >$49,000 per abstinent-year, across all perspectives.

CONCLUSIONS

XR-NTX administered to persons who are incarcerated with OUD before release may provide value for stakeholders and bridge a well-known treatment gap for this vulnerable population. Lower than expected participant engagement and missing data limit our results, and study outcomes may be sensitive to methods that address missing data if replicated.

Health economic analyses of the justice community opioid innovation network (JCOIN)

The Justice Community Opioid Innovation Network (JCOIN) will generate real-world evidence to address the unique needs of people with opioid use disorder (OUD) in justice settings. Evidence regarding the economic value of OUD interventions in justice populations is limited. Moreover, the variation in economic study designs is a barrier to defining specific interventions as broadly cost-effective. The JCOIN Health Economics Analytic Team (HEAT) has worked closely with the Measures Committee to incorporate common economic measures and instruments across JCOIN studies, which will: a) ensure rigorous economic evaluations within each trial; b) enhance comparability of findings across studies; and c) allow for cross-study analyses of trials with similar designs/settings (e.g., pre-reentry MOUD), to assess questions beyond the scope of a single study, while controlling for and evaluating the effect of intervention-, organizational-, and population-level characteristics. We describe shared trial characteristics relevant to the economic evaluations, and discuss potential cross-study economic analyses.

Health-related quality of life and opioid use disorder pharmacotherapy: A secondary analysis of a clinical trial

OBJECTIVE

To examine the health-related quality-of-life (HRQoL) of persons with opioid use disorder (OUD) seeking treatment in an inpatient detoxification or short-term residential setting; continuing treatment as outpatients.

METHODS

We conducted a secondary analysis of data from a clinical trial (N = 508) where participants were randomized to extended-release naltrexone or buprenorphine-naloxone for the prevention of opioid relapse. We used a generalized structural equation regression mixture model to identify associations of HRQoL (EQ-5D) trajectories, including latent characteristics, over the 24-week trial and 36-week follow-up period, among participants who reported HRQoL beyond baseline. This novel framework accounted for baseline and time-varying characteristics, while simultaneously identifying latent classes.

RESULTS

We identified two subpopulations: HRQoL "pharmacotherapy responsive" (82.3 %) and HRQoL "characteristic sensitive" (17.7 %). The pharmacotherapy responsive subpopulation was characterized by a shortterm HRQoL improvement and then stable HRQoL over time, and by a positive association between HRQoL and receiving pharmacotherapy in the past 30 days. The characteristic sensitive subpopulation was characterized by an initial improvement in HRQoL with a gradual decline over time, and no significant HRQoL response to pharmacotherapy. HRQoL changes over time in this subpopulation were more influenced by baseline demographic, socioeconomic, and psychosocial characteristics.

CONCLUSION

Our findings suggest that while HRQoL may be improved and sustained through targeted efforts to promote use of pharmacotherapy for many persons with OUD, an identifiable subpopulation may require additional services that address socioeconomic and psychosocial issues to achieve HRQoL benefits. Our analysis provides insight for improving individualized care for persons with opioid use disorder seeking treatment.