BackgroundThe Alzheimer's Disease Assessment Scale Cognitive Behavior Section (ADAS-cog), a measure of cognitive performance, has been used widely in Alzheimer's disease trials. Its key role in ...clinical trials should be supported by evidence that it is both clinically meaningful and scientifically sound. Its conceptual and neuropsychological underpinnings are well-considered, but its performance as an instrument of measurement has received less attention.ObjectiveTo examine the traditional psychometric properties of the ADAS-cog in a large sample of people with Alzheimer's disease.MethodsData from three clinical trials of donepezil (Aricept) in mild-to-moderate Alzheimer's disease (n=1421; MMSE 10–26) were analysed at both the scale and component level. Five psychometric properties were examined using traditional psychometric methods. These methods of examination underpin upcoming Food and Drug Administration recommendations for patient rating scale evaluation.ResultsAt the scale-level, criteria tested for data completeness, scaling assumptions (eg, component total correlations: 0.39–0.67), targeting (no floor or ceiling effects), reliability (eg, Cronbach's α: = 0.84; test-retest intraclass correlations: 0.93) and validity (correlation with MMSE: −0.63) were satisfied. At the component level, 7 of 11 ADAS-cog components had substantial ceiling effects (range 40–64%).ConclusionsPerformance was satisfactory at the scale level, but most ADAS-cog components were too easy for many patients in this sample and did not reflect the expected depth and range of cognitive performance. The clinical implication of this finding is that the ADAS-cog's estimate of cognitive ability, and its potential ability to detect differences in cognitive performance under treatment, could be improved. However, because of the limitations of traditional psychometric methods, further evaluations would be desirable using additional rating scale analysis techniques to pinpoint specific improvements.
Tofacitinib is an oral Janus kinase inhibitor. This trial assessed the efficacy and safety of tofacitinib versus placebo in patients with polyarticular course juvenile idiopathic arthritis (JIA).
...This double-blind, withdrawal phase 3 trial enrolled patients with polyarticular course JIA (extended oligoarthritis, rheumatoid factor-positive or rheumatoid factor-negative polyarthritis, or systemic JIA without active systemic features) aged 2 years to younger than 18 years, and was done at 64 centres of the Paediatric Rheumatology International Trials Organisation and Pediatric Rheumatology Collaborative Study Group networks in 14 countries. Patients with psoriatic arthritis or enthesitis-related arthritis were enrolled for exploratory endpoints. During part 1 of the study, patients received oral open-label tofacitinib (weight-based doses; 5 mg twice daily or lower) for 18 weeks. Patients achieving at least JIA/American College of Rheumatology 30 response were randomly assigned (1:1) using an Interactive Response Technology system to continue tofacitinib or switch to placebo in part 2 of the study for 26 weeks. The primary endpoint was JIA flare rate by week 44 in part 2 in patients with polyarticular course JIA; the intention-to-treat principle was applied. Safety was evaluated throughout part 1 and part 2 of the study in all patients who received one dose or more of study medication. This trial is registered with ClinicalTrials.gov, NCT02592434.
Between June 10, 2016, and May 16, 2019, of 225 patients enrolled, 184 (82%) patients had polyarticular course JIA, 20 (9%) had psoriatic arthritis, and 21 (9%) had enthesitis-related arthritis. 147 (65%) of 225 patients received concomitant methotrexate. In part 2, 142 patients with polyarticular course JIA were assigned to tofacitinib (n=72) or placebo (n=70). Flare rate by week 44 was significantly lower with tofacitinib (21 29% of 72 patients) than with placebo (37 53% of 70 patients; hazard ratio 0·46, 95% CI 0·27–0·79; p=0·0031). In part 2 of the study, adverse events occurred in 68 (77%) of 88 patients receiving tofacitinib and 63 (74%) of 85 in the placebo group. Serious adverse events occurred in one (1%) and two (2%), respectively. In the entire tofacitinib exposure period, 107 (48%) of 225 patients had infections or infestations. There were no deaths during this study.
The results of this pivotal trial show that tofacitinib is an effective treatment in patients with polyarticular course JIA. New oral therapies are particularly relevant for children and adolescents, who might prefer to avoid injections.
Pfizer.
...given that steroid doses were kept stable from before enrolment until primary outcome evaluation, influence on reported flare and response rates is null. HIB has received research grants from ...Bristol-Myers Squibb, MedImmune, Novartis, and Pfizer; is an employee of Cincinnati Children's Hospital Medical Center; has received consulting fees or other remuneration from AbbVie, AstraZeneca–MedImmune, Bayer, Biocon, Boehringer Ingelheim, Janssen, Lilly, Bristol-Myers Squibb, Novartis, Pfizer, Roche, and R-Pharm; and is a member of speaker bureaus for GlaxoSmithKline, Novartis, and Roche. DJL's institution, the Cincinnati Children's Hospital Medical Center, has received research grants from Bristol-Myers Squibb, Janssen, Novartis, Pfizer, Roche, and UCB.
OBJECTIVE:To evaluate the comparative safety and adjunctive efficacy of pregabalin and gabapentin in reducing seizure frequency in patients with partial-onset seizures based on prestudy modeling ...showing superior efficacy for pregabalin.
METHODS:The design of this comparative efficacy and safety study of pregabalin and gabapentin as adjunctive treatment in adults with refractory partial-onset seizures was randomized, flexible dose, double blind, and parallel group. The study included a 6-week baseline and a 21-week treatment phase. The primary endpoint was the percentage change from baseline in 28-day seizure rate to the treatment phase.
RESULTS:A total of 484 patients were randomized to pregabalin (n = 242) or gabapentin (n = 242). Of these, 359 patients (187 pregabalin, 172 gabapentin) completed the treatment phase. The observed median and mean in percentage change from baseline was −58.65 and −47.7 (SD 48.3) for pregabalin and −57.43 and −45.28 (SD 60.6) for gabapentin. For the primary endpoint, there was no significant difference between treatments. The Hodges-Lehman estimated median difference was 0.0 (95% confidence interval −6.0 to 7.0). Safety profiles were comparable and consistent with prior trials.
CONCLUSIONS:The absence of the anticipated efficacy difference based on modeling of prior, nearly identical trials and the larger-than-expected response rates of the 2 antiepileptic drugs were unexpected. These findings raise questions that are potentially important to consider in future comparative efficacy trials.
CLINICALTRIALS.GOVIDENTIFIER:NCT00537940.
CLASSIFICATION OF EVIDENCE:This study provides Class II evidence that for patients with partial seizures enrolled in this study, pregabalin is not superior to gabapentin in reducing seizure frequency. Because of the atypical response rates, the results of this study are poorly generalizable to other epilepsy populations.
Summary
Objectives
To assess the efficacy and tolerability of add‐on pregabalin controlled‐release formulation (PGB‐CR) (doses of 165 or 330 mg/day) in patients with partial‐onset seizures (POS).
...Methods
This was a randomized, double‐blind (DB), parallel‐group study of PGB‐CR once‐daily as adjunctive treatment in adults with treatment‐resistant partial seizures. After an 8‐week baseline period, eligible patients were randomized (1:1:1) to placebo, PGB‐CR 165 mg, or PGB‐CR 330 mg for 14 weeks, including a 2‐week dose escalation. Primary endpoint was the loge‐transformed 28‐day seizure rate for all POS with observable component during the full 14‐week double‐blind treatment phase. Secondary endpoints included the 50% responder rate and percent change from baseline in 28‐day POS rate.
Results
Three hundred twenty‐three patients were randomized and received treatment; placebo (n = 110), PGB‐CR 330 mg (n = 100), PGB‐CR 165 mg (n = 113); and 287 (88.9%) completed the trial. The primary efficacy analysis result, expressed as percent reduction from placebo, was 13.1% and 1.0% for PGB‐CR 330 mg and PGB‐CR 165 mg, respectively, and was not statistically significant (p = 0.091, 0.908). The proportion of 50% responders was similar for placebo (35.8%) and 165 mg PGB‐CR (37.8%) and nominally higher for 330 mg PGB‐CR (45.9%, p = 0.125 compared to placebo). The LS mean estimates of the percent change from baseline for placebo (−5.7%) was nominally smaller than 165 mg PGB‐CR (−15.0%, p = 0.540) and 330 mg PGB‐CR (−31.5%, p = 0.079); however, the median percent changes from baseline were not as well differentiated (placebo, −35.4%; 165 mg PGB‐CR, −38.0%; 330 mg PGB‐CR −43.4%). Rates of adverse events (AEs) were low for placebo and study drug; the most frequent reported AEs were dizziness, somnolence, and fatigue, consistent with the immediate‐release formulation.
Significance
Results from this trial did not demonstrate that PGB‐CR is effective in reducing seizure frequency below that of placebo. Both doses of PGB‐CR were shown to be safe and well‐tolerated.
A PowerPoint slide summarizing this article is available for download in the Supporting Information section here.
Abstract Reversible axonal swelling and brainstem auditory evoked potential (BAEP) changes were observed in standard chronic (9‐month) toxicology studies in dogs treated with ritlecitinib, an oral ...Janus kinase 3/tyrosine kinase expressed in hepatocellular carcinoma family kinase inhibitor, at exposures higher than the approved 50‐mg human dose. To evaluate the clinical relevance of the dog toxicity finding, this phase 2a, double‐blind study assessed BAEP changes and intraepidermal nerve fiber (IENF) histology in adults with alopecia areata treated with ritlecitinib. Patients were randomized to receive oral ritlecitinib 50 mg once daily (QD) with a 4‐week loading dose of 200 mg QD or placebo for 9 months (placebo‐controlled phase); they then entered the active‐therapy extension and received ritlecitinib 50 mg QD (with a 4‐week loading dose of 200 mg in patients switching from placebo). Among the 71 patients, no notable mean differences in change from baseline (CFB) in Waves I–V interwave latency (primary outcome) or Wave V amplitude on BAEP at a stimulus intensity of 80 dB nHL were observed in the ritlecitinib or placebo group at Month 9, with no notable differences in interwave latency or Wave V amplitude between groups. The CFB in mean or median IENF density and in percentage of IENFs with axonal swellings was minimal and similar between groups at Month 9. Ritlecitinib treatment was also not associated with an imbalanced incidence of neurological and audiological adverse events. These results provide evidence that the BAEP and axonal swelling finding in dogs are not clinically relevant in humans.
Abstract The Alzheimer's disease (AD) Cognitive Behavior Section (ADAS-Cog) is the most commonly used cognitive test in clinical trials of AD. Recent trials have focused on people earlier in the ...course of disease; however, there are concerns about using the ADAS-Cog at this crucial stage. Using data from the Alzheimer's disease Neuroimaging Initiative study, we used a range of traditional psychometric tests to evaluate those concerns. This issue of Alzheimer's & Dementia includes two articles that evaluate the ADAS-Cog. These articles report evaluations using two psychometric approaches: traditional methods and new methods. In this review, we provide accompanying background information to this program of research.
Assessment of cognition in early dementia Silverberg, Nina B; Ryan, Laurie M; Carrillo, Maria C ...
Alzheimer's & dementia,
20/May , Letnik:
7, Številka:
3
Journal Article
Recenzirano
Odprti dostop
Abstract Better tools for assessing cognitive impairment in the early stages of Alzheimer’s disease (AD) are required to enable diagnosis of the disease before substantial neurodegeneration has taken ...place and to allow for detection of subtle changes in the early stages of progression of the disease. The National Institute on Aging and the Alzheimer’s Association convened a meeting to discuss state-of-the art methods for cognitive assessment, including computerized batteries, as well as new approaches in the pipeline. Speakers described research using novel tests of object recognition, spatial navigation, attentional control, semantic memory, semantic interference, prospective memory, false memory, and executive function as among the tools that could provide earlier identification of individuals with AD. In addition to early detection, there is a need for assessments that reflect real-world situations so as to better assess functional disability. It is especially important to develop assessment tools that are useful in ethnically, culturally, and linguistically diverse populations as well as in individuals with neurodegenerative disease other than AD.
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