FDA Approval and Regulation of Pharmaceuticals, 1983-2018

Double Orthogonal Click Reactions for the Development of Antimicrobial Peptide Nanotubes

A new class of amphipathic cyclic peptides, which assemble in bacteria membranes to form polymeric supramolecular nanotubes giving them antimicrobial properties, is described. The method is based on the use of two orthogonal clickable transformations to incorporate different hydrophobic or hydrophilic moieties in a simple, regioselective, and divergent manner. The resulting cationic amphipathic cyclic peptides described in this article exhibit strong antimicrobial properties with a broad therapeutic window. Our studies suggest that the active form is the nanotube resulted from the parallel stacking of the cyclic peptide precursors. Several techniques, CD, FTIR, fluorescence, and STEM, among others, confirm the nanotube formation.

A chronicle of the 17-alpha hydroxyprogesterone caproate story to prevent recurrent preterm birth

Preterm birth is a substantial public health concern. In 2019, the US preterm birth rate was 10.23%, which is the fifth straight year of increase in this rate. Moreover, preterm birth accounts for approximately 1 in 6 infant deaths, and surviving children often suffer developmental delay or long-term neurologic impairment. Although the burden of preterm birth is clear, identifying strategies to reduce preterm birth has been challenging. On October 29, 2019, a US Food and Drug Administration advisory committee voted 9 vs 7 to withdraw interim accelerated approval of 17-alpha hydroxyprogesterone caproate for preventing recurrent preterm birth because the called for a confirmatory trial, known as the Prevention of Preterm Birth in Women With a Previous Singleton Spontaneous Preterm Delivery trial, was not confirmatory. The Prevention of Preterm Birth in Women With a Previous Singleton Spontaneous Preterm Delivery trial included subjects enrolled in the United States and Canada to ensure that at least 10% of patients would be from North America; however, this trial took 9 years to complete and did not demonstrate significant treatment effects in the 2 primary outcomes of interest. Delivery before 35 weeks' gestation occurred in 122 of 1130 women (11%) given 17-alpha hydroxyprogesterone caproate compared with 66 of 578 women (11.5%) given placebo (relative risk, 0.95; 95% confidence interval, 0.71-1.26; P=.72). Similarly, the coprimary outcome neonatal composite index occurred in 61 of 1093 women (5.6%) given 17-alpha hydroxyprogesterone caproate compared with 28 of 559 women (5.0%) given placebo (relative risk, 1.12; 95% confidence interval, 0.68-1.61; P=.73). There was also a lack of efficacy for 17-alpha hydroxyprogesterone caproate treatment in the analysis of a variety of secondary outcomes. Like the Maternal-Fetal Medicine Units Network trial, the Prevention of Preterm Birth in Women With a Previous Singleton Spontaneous Preterm Delivery trial was also flawed. Importantly, the Maternal-Fetal Medicine Unit Network trial was the sole justification for treating women in the United States with 17-alpha hydroxyprogesterone caproate for nearly 2 decades. Currently, despite more than half a century, 17-alpha hydroxyprogesterone caproate still has not been found to be clearly effective. In this context, how does the advising physician dependent on scientific evidence advise a patient that 17-alpha hydroxyprogesterone caproate is effective when the evidence to support this advice has repeatedly been found to be inadequate? This clinical opinion is a critical appraisal of the 2 randomized trials examining the efficacy of 17-alpha hydroxyprogesterone caproate to prevent recurrent preterm birth and a chronicle of events in the regulatory process of drug approval to help answer this question. With this examination, these events illustrate the complexity of pharmaceutical regulations in the era of accelerated Food and Drug Administration approval and characterize the financial impact and influence in medicine. In this report, we also emphasize the value of observational studies in contemporary practice and identify other examples in medicine where accelerated Food and Drug Administration approval has been withdrawn. Importantly, the themes of the 17-alpha hydroxyprogesterone caproate story are not limited to obstetrics. It can also serve as a microcosm of issues within the US healthcare system, which ultimately contributes to the high cost of healthcare. In our opinion, the answer to the question is clear-the facts speak for themselves-and we believe 17-alpha hydroxyprogesterone caproate should not be endorsed for use to prevent recurrent preterm birth in the United States.

The Potential Benefit of Expedited Development and Approval Programs in Precision Medicine

BACKGROUND

Increased understanding of the molecular causes of disease has begun to fulfill the promise of precision medicine with the development of targeted drugs, particularly for serious diseases with unmet needs. The drug approval regulatory process is a critical component to the continued growth of precision medicine drugs and devices. To facilitate the development and approval process of drugs for serious unmet needs, four expedited approval programs have been developed in the US: priority review, accelerated approval, fast track, and breakthrough therapy programs.

METHODS

To determine if expedited approval programs are fulfilling the intended goals, we reviewed drug approvals by the US Food and Drug Administration (FDA) between 2011 and 2017 for new molecular entities (NMEs).

RESULTS

From 2011 through 2017, the FDA approved 250 NMEs, ranging from 27 approvals in 2013 to 46 in 2017. The NME approvals spanned 22 different disease classes; almost one-third of all NMEs were for oncology treatments.

CONCLUSIONS

As these pathways are utilized more, additional legislative changes may be needed to re-align incentives to promote continued development of innovative drugs for serious unmet needs in a safe, efficacious, and affordable manner.

Identification of disulfiram as a potential antifungal drug by screening small molecular libraries

OBJECTIVES

Candida albicans and Candida auris strains are common causative species of Candidiasis. The limited number of antifungal drugs and the current situation of resistance to existing antifungals force us to search for new antifungal alternatives.

METHODS

In this work, primary screening of small molecule libraries (Metabolism Compound Library and Epigenetics Compound Library) consisting of 584 compounds against Candida albicans SC5314 was performed. The dose-response assays, XTT assays, scanning electron microscopy and confocal laser scanning microscopy were used to confirm the antifungal activities of the selected compounds against Candida strains.

RESULTS

Through the primary screening, we identified five compounds (U73122, disulfiram, BSK805, BIX01294, and GSKJ4) that inhibited strains growth ≥ 80% for dose-response assays. Disulfiram was identified as the most potent repositionable antifungal drug with 50% growth inhibition detected at a concentration as low as 1 mg/L. The further results showed the antifungal activity of disulfiram against biofilm formation of Candida strains with a 50% minimum inhibitory concentration ranging from 32 to 128 mg/L. Further observations by scanning electron microscopy and confocal laser scanning microscopy confirmed the destruction of biofilm architecture and the change of biofilm morphology after being exposed to disulfiram.

CONCLUSION

The study indicated the potential clinical application of disulfiram as a promising antifungal drug against candidiasis.

Transforming vaccine development

The urgency to develop vaccines against Covid-19 is putting pressure on the long and expensive development timelines that are normally required for development of lifesaving vaccines. There is a unique opportunity to take advantage of new technologies, the smart and flexible design of clinical trials, and evolving regulatory science to speed up vaccine development against Covid-19 and transform vaccine development altogether.

Evolving use of real-world evidence in the regulatory process: a focus on immuno-oncology treatment and outcomes

In recent years, regulatory bodies have increasingly recognized the utility of real-world evidence (RWE) for supplementing and supporting clinical trial data in new drug applications. Nevertheless, the integration of RWE into established regulatory processes is complex and the generation of 'regulatory-grade' real-world data faces operational, methodological, data-related and policy-related challenges. In parallel with this evolving role for RWE, immuno-oncology therapies have emerged as leading cancer treatments and are expected to continue to play a central role in the future. In this article, we review the current literature on the use of RWE for regulatory submissions, with a focus on novel anticancer immunotherapies, and discuss the utility and current limitations of RWE in the context of drug development and regulatory approvals.

Comparatively Ineffective? PCORI and the Uphill Battle to Make Evidence Count in US Medicine

The Patient-Centered Outcomes Research Institute (PCORI) was established as part of the Affordable Care Act to promote research on the comparative effectiveness of treatment options. Advocates hoped this information would help reduce wasteful spending by identifying low-value treatments, but many conservatives and industry groups feared PCORI would ration care and threaten physicians' autonomy. PCORI faced three challenges during its first decade of operation: overcoming the controversy of its birth and escaping early termination, shaping medical practice, and building a public reputation for relevance. While PCORI has won reauthorization, it has not yet had a major impact on the decisions of clinicians or payers. PCORI's modest footprint reflects not only the challenges of getting a new organization off the ground but also the larger political, financial, and cultural barriers to the uptake of medical evidence in the US health care system. The growing attention among policymakers and researchers to provider prices (rather than utilization) as the driver of health care spending could be helpful to the political prospects of the evidence-based medicine project by making it appear to be less as rationing driven by costs and more as an effort to improve quality and uphold medical professionalism.

Changes in PBM Business Practices in 2019: True Innovation or More of the Same?

In 2019, pharmacy benefit managers (PBMs) responded to intense public criticism with business model changes described as movements toward full transparency and innovation to reduce costs for benefit plan sponsors. We critically analyze these changes in light of key challenges in specialty drug management: pharmaceutical manufacturer practices (price increases driven by coverage mandates and lack of price control, intensive and sometimes misleading advertising, patent extensions), FDA changes (increased reliance on manufacturer funding, weakened evidentiary base for drug approvals), and provider prescribing patterns (lag from evidence to routine practice, manufacturer influences on the knowledge base, direct manufacturer payments to frequent prescribers). The persistence of controversial PBM practices suggests that business model changes were mostly cosmetic, without altering key marketplace dysfunctions. Examples include "spread" pricing, in which PBMs pay pharmacies less than employer-paid amounts; rebate-influenced formulary development; and shifting of prescription volume to PBM-owned pharmacies. Spread in Medicaid was estimated at $224.8 million in Ohio and $123.5 million in Kentucky in 1-year periods and is the subject of an ongoing federal investigation. Rebate influence on formulary development is suggested by slow biosimilar adoption and a study documenting little association between brand exclusions and clinical or cost-effectiveness. Even in 100% passthrough arrangements, the price differential between rebated products and lower-cost alternatives may far exceed revenues returned to the payer. Shifting of business to PBM-owned pharmacies was identified in Florida managed Medicaid in 2018, where the state's 5 largest specialty pharmacies, all owned by managed care organizations or PBMs, collected 28% of prescription drug profit despite dispensing only 0.4% of claims. Finally, contract provisions and terms typically limit the ability of plan sponsors to monitor PBM performance. These include "offsetting," changes in definitions (e.g., "single-source generic") during the contract term, restrictions on audit rights, and exclusion of some pharmaceutical manufacturer revenues from "100%" passthroughs. We conclude that ostensibly positive changes in PBM practices have been offset by undisclosed business arrangements, shifts to alternative revenue sources, and opaque contractual terms. Establishing and maintaining a sustainable benefit will require fundamental alterations to this dysfunctional market DISCLOSURES: This work was funded solely by Archimedes, with no external funding. Motheral is the CEO of Archimedes, a specialty drug management company, and EpiphanyRx, a PBM that provides alternatives to the business models described in this article. Fairman is a consultant to Archimedes.

Low-Dose Naltrexone for Chronic Pain: Update and Systemic Review

PURPOSE OF REVIEW

The purpose of this review is to evaluate and explain our current understanding of the clinical use of low-dose naltrexone in the treatment of chronic pain.

RECENT FINDINGS

Recent pre-clinical uses and clinical studies further elucidate the use of low-dose naltrexone in the treatment of chronic pain. Low-dose naltrexone (LDN) has shown promise to reduce symptoms related to chronic pain conditions such as fibromyalgia, inflammatory bowel conditions, and multiple sclerosis. The mechanism of LDN appears to be modulation of neuro-inflammation, specifically, the modulation of the glial cells and release of inflammatory chemicals in the central nervous system. These effects appear to unique at low dosage compared to dosage for food and drug administration approved use for alcohol and opioid dependence. We review the evidence that LDN has shown more than promise and should be further investigated in clinical practice.

Update to Drugs, Devices, and the FDA: How Recent Legislative Changes Have Impacted Approval of New Therapies

Two major legislative actions since 2015, the 21st Century Cures Act of 2016 and the U.S. Food and Drug Administration (FDA) Reauthorization Act of 2017, contain significant provisions that potentially streamline drug development times, and by extension, may reduce costs. Evidence suggests, however, that development times have already been significantly affected by previous legislation and FDA programs, through accelerated approval pathways and adoption of more flexible definitions of clinical evidence of efficacy. The COVID-19 pandemic is pushing researchers and commercial entities to further test the limits of drug and vaccine development times and approvals, at an as yet unknown level of risk to patients. COVID-19 drug and vaccine trials are even now making use of accelerated drug approval programs, blended trials, and adaptive trial design to accelerate approval of therapeutics in the pandemic.

Abdullah H, Roomi S, Sattar Y, Almas T, Narayana Gowda S, Saeed R, Mukhtar M, Ahmad A, Oliver T, Alraies MC, Haas DC, Fischman DL. Safety and Efficacy of Hydroxychloroquine in COVID-19: A Systematic Review and Meta-Analysis

BACKGROUND

During the initial phases of the coronavirus disease 2019 (COVID-19) epidemic, there was an unfounded fervor surrounding the use of hydroxychloroquine (HCQ); however, recently, the Centers for Disease Control and Prevention (CDC) has recommended against routine use of HCQ outside of study protocols citing possible adverse outcomes.

METHODS

Multiple databases were searched to identify articles on COVID-19. An unadjusted odds ratio (OR) was used to calculate the safety and efficacy of HCQ on a random effect model.

RESULTS

Twelve studies comprising 3,912 patients (HCQ 2,512 and control 1400) were included. The odds of all-cause mortality (OR: 2.23, 95% confidence interval (CI): 1.58 - 3.13, P value < 0.00001) were significantly higher in patients on HCQ compared to patients on control agent. The response to therapy assessed by negative repeat polymerase chain reaction (PCR) (OR: 1.83, 95% CI: 0.50 - 6.75, P = 0.36), radiological resolution (OR: 1.98, 95% CI: 0.47 - 8.36, P value = 0.36) and the need for invasive mechanical ventilation (IMV) (OR: 1.21, 95% CI: 0.34 - 4.33, P value = 0.76) were identical between the two groups. Overall, four times higher odds of net adverse events (NAEs) were observed in the HCQ group (OR: 4.59, 95% CI 1.73 - 12.20, P value = 0.02). The measures for individual safety endpoints were also numerically lower in the control arm; however, none of these values reached the level of statistical significance.

CONCLUSIONS

HCQ might offer no benefits in terms of decreasing the viral load and radiological improvement in patients with COVID-19. HCQ appears to be associated with higher odds of all-cause mortality and NAEs.

Factors Related to Conversion from Accelerated to Full Approval for Drugs Approved in the United States Between 2000 and 2016

BACKGROUND

Accelerated approval (AA) is a program that grants approval to drugs based on clinical trial data for a surrogate endpoint or an intermediate clinical endpoint. Pharmaceutical companies are required to conduct a confirmatory trial to demonstrate true clinical benefit of the drug to obtain full approval (FA) for the AA. This study aimed at clarifying the points that should be considered by examining the characteristics of AA indications in all disease areas and the factors related to the status of conversion from AA to FA.

METHODS

AA indications granted from January 1, 2000, to June 30, 2016, were investigated from the aspects of the characteristics of AAs and the status of conversion from AA to FA.

RESULTS

Eighty-nine AAs were examined, of which 65 were converted to FA and 24 were not. A significant association was found between the FA status and period in which AA was granted, disease area, availability of IA data of a confirmatory trial for FA at the time of AA, and sales ranking of the company.

CONCLUSIONS

To successfully convert from AA to FA, a development plan that focuses not only on AA but also on future FA needs to be considered and implemented from the early stage of development in line with the FDA guidance. In particular, for companies with insufficient experience in the development of AA indications and for products/indications without an established endpoint, more active discussion with the regulatory authorities from an early stage of development should be encouraged.

Commentary: Expedited Regulatory Review of Low-Value Drugs

Lexchin has criticized Health Canada's recently published draft guidance on accelerated drug review, expressing concern over agency conflicts of interest and observing that priority review and notice of compliance with conditions correlate poorly with therapeutic benefit. Although agency operations may be imperfect, perhaps the most important finding of Lexchin's research is that only 11% of newly approved drugs provide meaningful benefit over standard treatments. To improve the expedited review process in light of these findings, we suggest eliminating user fees and fully funding the review process with public monies, reserving the use of expedited approval pathways for when preliminary measures of benefit are so large that traditional approval thresholds can be met earlier in the clinical trial process, improving labelling to quantitatively communicate drug benefits and risks, and avoiding the use of titles such as “priority” review, which could imply a magnitude of clinical superiority that has not been established.

Working Hard or Hardly Working? Regulatory Bottlenecks in Developing a COVID-19 Vaccine

Vaccine solutions rarely reach the public until after an outbreak abates; an Ebola vaccine was approved 5 years after peak outbreak and SARS, MERS, and Zika vaccines are still in clinical development. Despite massive leaps forward in rapid science, other regulatory bottlenecks are hamstringing the global effort for pandemic vaccines.

New Drugs Approved in 2019

In 2019, the US Food and Drug Administration (FDA) approved 48 novel drugs. Thirty of the 48 (62.5%) novel drug approvals were reviewed and approved through an expedited review pathway while 20 of the 48 (41.7%) were approved for treatment of a rare disease. This review includes a summary of the novel drugs approved by the FDA in 2019.

Current System of Overseeing Drug Trials in Developing Countries by the FDA Is Dangerous

Clinical research used to substantiate Food and Drug Administration (FDA) drug approval is increasingly being conducted overseas. One of the enticements to move overseas is unequal oversight by the FDA, and these differences can result in poor quality research and human subject risk. Downstream, patients, clinicians, and payers of health care can be harmed by inaccuracies in the new drug approval process. The need of the hour is to bridge the gap in the standards by ensuring that the investigators in the developing countries adhere to the same quality standards as the domestic investigators.