Comparison of Duration of Postapproval vs Pivotal Trials for Therapeutic Agents Granted US Food and Drug Administration Accelerated Approval, 2009-2018

Clinical Benefit and Regulatory Outcomes of Cancer Drugs Receiving Accelerated Approval

Importance

The US Food and Drug Administration's (FDA) accelerated approval pathway allows approval of investigational drugs treating unmet medical needs based on changes to surrogate measures considered "reasonably likely" to predict clinical benefit. Postapproval clinical trials are then required to confirm whether these drugs offer clinical benefit.

Objective

To determine whether cancer drugs granted accelerated approval ultimately demonstrate clinical benefit and to evaluate the basis of conversion to regular approval.

Design, Setting, and Participants

In this cohort study, publicly available FDA data were used to identify cancer drugs granted accelerated approval from 2013 to 2023.

Main Outcomes and Measures

Demonstrated improvement in quality of life or overall survival in accelerated approvals with more than 5 years of follow-up, as well as confirmatory trial end points and time to conversion for drug-indication pairs converted to regular approval.

Results

A total of 129 cancer drug-indication pairs were granted accelerated approval from 2013 to 2023. Among 46 indications with more than 5 years of follow-up (approved 2013-2017), approximately two-thirds (29, 63%) were converted to regular approval, 10 (22%) were withdrawn, and 7 (15%) remained ongoing after a median of 6.3 years. Fewer than half (20/46, 43%) demonstrated a clinical benefit in confirmatory trials. Time to withdrawal decreased from 9.9 years to 3.6 years, and time to regular approval increased from 1.6 years to 3.6 years. Among 48 drug-indication pairs converted to regular approval, 19 (40%) were converted based on overall survival, 21 (44%) on progression-free survival, 5 (10%) on response rate plus duration of response, 2 (4%) on response rate, and 1 (2%) despite a negative confirmatory trial. Comparing accelerated and regular approval indications, 18 of 48 (38%) were unchanged, while 30 of 48 (63%) had different indications (eg, earlier line of therapy).

Conclusions and Relevance

Most cancer drugs granted accelerated approval did not demonstrate benefit in overall survival or quality of life within 5 years of accelerated approval. Patients should be clearly informed about the cancer drugs that use the accelerated approval pathway and do not end up showing benefits in patient-centered clinical outcomes.

Characterization of accelerated approval status, trial endpoints and results, and recommendations in guidelines for oncology drug treatments from the National Comprehensive Cancer Network: cross sectional study

Objectives

To evaluate National Comprehensive Cancer Network (NCCN) guideline recommendations for oncology drug treatments that have been granted accelerated approval, and to determine whether recommendations are updated based on the results of confirmatory trials after approval and based on status updates from the US Food and Drug Administration (FDA).

Design

Cross sectional study.

Setting

US FDA and NCCN guidelines.

Population

Oncology therapeutic indications (ie, specific oncological conditions for which the drug is recommended) that have been granted accelerated approval in 2009-18.

Main outcome measures

NCCN guideline reporting of accelerated approval status and postapproval confirmatory trials, and guideline recommendation alignment with postapproval confirmatory trial results and FDA status updates.

Results

39 oncology drug treatments were granted accelerated approval for 62 oncological indications. Although all indications were recommended in NCCN guidelines, accelerated approval status was reported for 10 (16%) indications. At least one postapproval confirmatory trial was identified for all 62 indications, 33 (53%) of which confirmed benefit; among these indications, NCCN guidelines maintained the previous recommendation or strengthened the category of evidence for 27 (82%). Postapproval confirmatory trials failed to confirm benefit for 12 (19%) indications; among these indications, NCCN guidelines removed the previous recommendation or weakened the category of evidence for five (42%). NCCN guidelines reflected the FDA's decision to convert 30 (83%) of 36 indications from accelerated to traditional approval, of which 20 (67%) had guideline updates before the FDA's conversion decision. NCCN guidelines reflected the FDA's decision to withdraw seven (58%) of 12 indications from the market, of which four (57%) had guidelines updates before the FDA's withdrawal decision.

Conclusions

NCCN guidelines always recommend drug treatments that have been granted accelerated approval for oncological indications, but do not provide information about their accelerated approval status, including surrogate endpoint use and status of postapproval confirmatory trials. NCCN guidelines consistently provide information on postapproval trial results confirming clinical benefit, but not on postapproval trials failing to confirm clinical benefit. NCCN guidelines more frequently update recommendation for indications converted to traditional approval than for those approvals that were withdrawn.

Aducanumab, Accelerated Approvals & the Agency: Why the FDA Needs Structural Reform

The US Food and Drug Administration's controversial decision to grant accelerated approval to aducanumab (Aduhelm), a therapy for Alzheimer's disease, has motivated multiple policy reforms. Drawing a case series of other drugs granted accelerated approval and interviews of senior FDA officials, I argue that reform should be informed but not defined by aducanumab. Rather, structural reforms are needed to reshape FDA's core priorities and restore the regulatory system's commitment to scientific rigor.

Physicians' Perspectives On FDA Regulation Of Drugs And Medical Devices: A National Survey

Physicians' knowledge of Food and Drug Administration (FDA) approval processes is important in informing clinical decisions and patient discussions. Among a randomly selected national sample of 509 internists, cardiologists, and oncologists, 41 percent reported moderate or better understanding of the FDA's drug approval process, and 17 percent reported moderate or better understanding of the FDA's medical device approval process. Nearly all physicians thought that randomized, blinded trials that met primary endpoints should be very important factors required to secure regulatory approval. Also, nearly all physicians thought that the FDA should revoke approval for accelerated-approval drugs or breakthrough devices that did not show benefit in postapproval studies. Our findings suggest that physicians commonly lack familiarity with drug and medical device regulatory practices and are under the impression that the data supporting FDA drug and high-risk device approvals are more rigorous than they often are. Physicians would value more rigorous premarket evidence, as well as regulatory action for drugs and devices that do not demonstrate safety and effectiveness in the postmarket setting.

Estimating the Potential Benefits of Confirmatory Trials for Drugs with Accelerated Approval: A Comprehensive Value of Information Framework

BACKGROUND

The US Food and Drug Administration's Accelerated Approval (AA) policy provides a pathway for patients to access potentially life-saving drugs rapidly. However, the use of surrogate endpoints, single-arm designs, and small sample sizes in preliminary trials that support AAs can lead to uncertainty regarding the clinical benefits of such drugs. This study aims to develop a comprehensive value of information (VOI) framework for assessing the potential benefits of future confirmatory trials, accounting for the various uncertainties inherent in preliminary trials.

METHODS

I formulated an expected value of information from confirmatory trial (EVICT) metric, which evaluates the potential benefits of a confirmatory trial that would reduce those uncertainties by using a clinically meaningful endpoint, a randomized control, and increased sample size. The EVICT metric can quantify the expected benefits of a well-designed confirmatory trial or an inadequately designed one that continues to use surrogate endpoints or single-arm design. The framework was illustrated using a hypothetical AA drug for metastatic breast cancer.

RESULTS

The case study demonstrates that a highly uncertain preliminary trial of an AA drug was associated with a substantial EVICT. A confirmatory trial with an increased sample size for this AA drug, utilizing a clinically meaningful endpoint and randomized control, yielded a population-level EVICT of $12.6 million. Persistently using a surrogate endpoint and single-arm trial design would reduce the EVICT by 60%.

CONCLUSIONS

This framework can provide accurate VOI estimates to guide coverage policies, value-based pricing, and the design of confirmatory trials for AA drugs.

Special FDA designations for drug development: orphan, fast track, accelerated approval, priority review, and breakthrough therapy

BACKGROUND

Over the past decades, US Congress enabled the US Food and Drug Administration (FDA) to facilitate and expedite drug development for serious conditions filling unmet medical needs with five special designations and review pathways: orphan, fast track, accelerated approval, priority review, and breakthrough therapy.

OBJECTIVES

This study reviews the FDA's five special designations for drug development regarding their safety, efficacy/clinical benefit, clinical trials, innovation, economic incentives, development timelines, and price.

METHODS

We conducted a keyword search to identify studies analyzing the impact of the FDA's special designations (orphan, fast track, accelerated approval, priority review, and breakthrough therapy) on the safety, efficacy/clinical benefit, trials, innovativeness, economic incentives, development times, and pricing of new drugs. Results were summarized in a narrative overview.

RESULTS

Expedited approval reduces new drugs' time to market. However, faster drug development and regulatory review are associated with more unrecognized adverse events and post-marketing safety revisions. Clinical trials supporting special FDA approvals frequently use small, non-randomized, open-label designs. Required post-approval trials to monitor unknown adverse events are often delayed or not even initiated. Evidence suggests that drugs approved under special review pathways, marketed as "breakthroughs", are more innovative and deliver a higher clinical benefit than those receiving standard FDA approval. Special designations are an economically viable strategy for investors and pharmaceutical companies to develop drugs for rare diseases with unmet medical needs, due to financial incentives, expedited development timelines, higher clinical trial success rates, alongside greater prices. Nonetheless, patients, physicians, and insurers are concerned about spending money on drugs without a proven benefit or even on drugs that turn out to be ineffective. While European countries established performance- and financial-based managed entry agreements to account for this uncertainty in clinical trial evidence and cost-effectiveness, the pricing and reimbursement of these drugs remain largely unregulated in the US.

CONCLUSION

Special FDA designations shorten clinical development and FDA approval times for new drugs treating rare and severe diseases with unmet medical needs. Special-designated drugs offer a greater clinical benefit to patients. However, physicians, patients, and insurers must be aware that special-designated drugs are often approved based on non-robust trials, associated with more unrecognized side effects, and sold for higher prices.

Comparison of novel oncology drugs that received dual approval from the US accelerated approval and EU conditional marketing authorisation pathways, 2006-2021: a cross-sectional study

OBJECTIVE

We aimed to provide insight into differences in drug review decisions made by the US Food and Drug Administration's (FDA) accelerated approval (AA) pathway and the European Medicines Agency's (EMA) conditional marketing authorisation (CMA) pathway, and to add to the current knowledge base of drug approval processes.

DESIGN, SETTING, PARTICIPANTS

This cross-sectional study thoroughly examines novel oncology drugs with dual approval through FDA AA and EMA CMA between 2006 and 2021. Statistical analysis was performed from June to July 2022.

PRIMARY AND SECONDARY OUTCOME MEASURES

The study examined the regulatory differences between regions for dually approved novel oncology drugs, including approval decisions, pivotal efficacy clinical trials, speed of review and postmarketing obligations.

RESULTS

During this time period, there was a difference in the use of the FDA AA and the EMA CMA (FDA: EMA: 41.2%: 70.0%, p<0.05). Of the 25 drugs approved by both the FDA AA and the EMA CMA, 22 (88.0%) of the regulatory decisions were based on the same pivotal clinical trials. But there were more differences in the requirements for postmarketing obligations, with the EMA's postmarketing obligations focusing on the efficacy and safety of the drug (EMA: FDA: 63.0%: 27.0%, p＜0.05) and the FDA's postmarketing obligations focusing more on the efficacy (FDA: EMA: 73.0%: 23.9%, p＜0.05). In addition, both the USA and EU had some postmarketing obligations completed beyond the schedule (30.4% and 19.2% in the USA and EU, respectively), with the longest delays lasting 3.7 years (0.2-3.7 years) and 3.3 years (0.04-3.3 years) in the USA and EU, respectively.

CONCLUSIONS

The FDA and EMA have different orientations and benefit-risk balance considerations in the use of AA or CMA. It is also the case that the shortcomings in the design and implementation of postmarketing studies have made it a challenge to obtain the evidence needed to confirm a drug's benefits.

Use of US Food and Drug Administration Expedited Drug Development and Review Programs by Orphan and Nonorphan Novel Drugs Approved From 2008 to 2021

IMPORTANCE

The US Food and Drug Administration (FDA) has 4 programs that can be used alone or in combination to expedite drug availability: Accelerated Approval, Breakthrough Therapy, Fast Track, and Priority Review. Drugs using these programs can include novel drugs, which do not contain a previously FDA-approved active moiety, and orphan drugs, intended for diseases or conditions affecting fewer than 200 000 people; to date, no comprehensive evaluation of how these programs have been used in combination has been published.

OBJECTIVE

To assess how often and in what combinations expedited programs are used in the development and review of approved novel biologics and small-molecule drugs, stratified by orphan drug status and indication.

DESIGN, SETTING, AND PARTICIPANTS

This cross-sectional study evaluated all novel drugs that were FDA approved between January 1, 2008, and December 31, 2021.

MAIN OUTCOMES AND MEASURES

The main outcome was the frequency with which expedited programs were used and in what combinations, stratified by orphan drug status and drug type (small molecule vs therapeutic biologic). The unit of analysis was the novel drug-indication pair because a drug can be approved for multiple indications, each of which may use a different expedited program or differ in orphan drug status.

RESULTS

The study included 581 novel drug-indication pairs approved during the 14-year study period; 252 (43.4%) were orphan drugs, 139 (23.9%) were therapeutic biologics, and 442 (76.1%) were small-molecule drugs. Use of at least 1 expedited program increased from 11 of 26 drug-indication pairs (42.3%) in 2008 to 41 of 55 (74.5%) in 2021. Of the 363 approved drug-indication pairs using at least 1 expedited program, 225 (62.0%) were orphan drugs; at least 1 expedited program was used by 97 of the 139 approved biologic drugs (69.8%) and by 266 of the 442 approved small-molecule drugs (60.2%). Eighty-two of the 581 novel drug-indication pairs (14.1%) used the Accelerated Approval Program; of those, 65 (79.3%) were oncology drugs and 70 (85.4%) had an orphan designation.

CONCLUSIONS AND RELEVANCE

The study showed that use of the FDA's expedited programs to bring novel drugs to market in the US increased from 2008 to 2021. The findings suggest that this trend is likely to continue.

Spending by the Centers for Medicare & Medicaid Services Before and After Confirmation of Benefit for Drugs Granted US Food and Drug Administration Accelerated Approval, 2012 to 2017

Question

Findings

Meaning

Importance

Objective

Design and Setting

Main Outcomes and Measures

Results

Conclusions and Relevance

Challenges in confirming drug effectiveness after early approval

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