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Duloxetine 60 mg for chronic low back pain: post hoc responder analysis of double-blind, placebo-controlled trials.

ABSTRACT: INTRODUCTION:Duloxetine has demonstrated efficacy in chronic low back pain (CLBP). We examined the predictors of response to duloxetine for CLBP. PATIENTS AND METHODS:This was a post hoc analysis of pooled data from 4 double-blind, ran-domized, placebo-controlled trials of duloxetine (60 mg/day for 12-14 weeks) in adult patients with CLBP. Primary outcome was proportion of patients with ?30% reduction in Brief Pain Inventory (BPI) average pain ("pain reduction") at 12-14 weeks. The proportion of patients with ?30% and ?50% (secondary outcome) pain reduction in duloxetine and placebo groups was compared. Variables for responder analyses were early improvement (?15% pain reduction at Week 2), sex, age, baseline BPI average pain score, duration of CLBP, and number of painful body sites according to the Michigan Body Map (?2 vs 1 [isolated CLBP]; 1 trial); relative risk (RR) and 95% confidence interval (CI) were calculated. RESULTS:Compared with placebo (n = 653), a greater proportion of duloxetine-treated patients (n = 642) achieved ?30% (59.7% vs 47.8%; P < 0.001) and ?50% pain reduction (48.6% vs 35.1%; P < 0.001). Among duloxetine-treated patients, early improvement was associated with greater likelihood of ?30% (RR [95% CI], 2.91 [2.30-3.67]) or ?50% (3.24 [2.44-4.31]) pain reduction. Women were slightly more likely than men to achieve ?30% (RR [95% CI], 1.14 [1.00-1.30]) or ?50% (1.17 [0.99-1.38]) pain reduction. Response rates were similar between age, CLBP duration, and baseline BPI average pain score subgroups. Patients with ?2 painful sites were more likely to respond to duloxetine 60 mg relative to placebo than patients with isolated CLBP (RR, duloxetine vs placebo [95% CI]: ?30% reduction, ?2 painful sites 1.40 [1.18-1.66], isolated CLBP 1.07 [0.78-1.48]; ?50% reduction, ?2 painful sites 1.51 [1.20-1.89], isolated CLBP 1.23 [0.81-1.88]). CONCLUSION:Early pain reduction was indicative of overall response. Patients with multiple painful sites had more benefit from duloxetine than patients with isolated CLBP.

SUBMITTER: Alev L

PROVIDER: S-EPMC5533563 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature

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Duloxetine 60 mg for chronic low back pain: post hoc responder analysis of double-blind, placebo-controlled trials.

Alev Levent L Fujikoshi Shinji S Yoshikawa Aki A Enomoto Hiroyuki H Ishida Mitsuhiro M Tsuji Toshinaga T Ogawa Kei K Konno Shinichi S

Journal of pain research 20170724

<h4>Introduction</h4>Duloxetine has demonstrated efficacy in chronic low back pain (CLBP). We examined the predictors of response to duloxetine for CLBP.<h4>Patients and methods</h4>This was a post hoc analysis of pooled data from 4 double-blind, ran-domized, placebo-controlled trials of duloxetine (60 mg/day for 12-14 weeks) in adult patients with CLBP. Primary outcome was proportion of patients with ≥30% reduction in Brief Pain Inventory (BPI) average pain ("pain reduction") at 12-14 weeks. Th ...[more]

PMID: 28769588

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Project description:A 14-week, randomized, double-blind, multicenter, placebo-controlled study of Japanese patients with chronic low back pain (CLBP) who were randomized to either duloxetine 60?mg once daily or placebo.This study aimed to assess the efficacy and safety of duloxetine monotherapy in Japanese patients with CLBP.In Japan, duloxetine is approved for the treatment of depression, diabetic neuropathic pain, and pain associated with fibromyalgia; however, no clinical study of duloxetine has been conducted for CLBP.The primary efficacy measure was the change in the Brief Pain Inventory (BPI) average pain score from baseline to Week 14. Secondary efficacy measures included BPI pain (worst pain, least pain, pain right now), Patient's Global Impression of Improvement, Clinical Global Impressions of Severity, and Roland-Morris Disability Questionnaire, among other measures, and safety and tolerability.In total, 458 patients were randomized to receive either duloxetine (n?=?232) or placebo (n?=?226). The BPI average pain score improved significantly in the duloxetine group compared with that in the placebo group at Week 14 [-2.43?±?0.11 vs. -1.96?±?0.11, respectively; between-group difference (95% confidence interval),?-?0.46 [-0.77 to-0.16]; P?=?0.0026]. The duloxetine group showed significant improvement in many secondary measures compared with the placebo group, including BPI pain (least pain, pain right now) (between-group difference: -1.69?±?0.10, P?=?0.0009; -2.42?±?0.12, P P?=?0.0230, respectively), Patient's Global Impression of Improvement (2.46?±?0.07, P?=?0.0026), Clinical Global Impressions of Severity (-1.46?±?0.06, P?=?0.0019), and Roland-Morris Disability Questionnaire (-3.86?±?0.22, P?=?0.0439). Adverse events occurring at a significantly higher incidence in the duloxetine group were somnolence, constipation, nausea, dizziness, and dry mouth, most of which were mild or moderate in severity and were resolved or improved.Duloxetine 60?mg was effective and well tolerated in Japanese CLBP patients.2.

Project description:IntroductionFibromyalgia is characterized by widespread pain and is often accompanied by accessory symptoms. There are limited treatment options for this condition in Japan. Therefore, we conducted a phase III study to assess the efficacy and safety of duloxetine in Japanese patients with fibromyalgia.MethodsThis randomized, double-blind, placebo-controlled, parallel-group trial was conducted in Japan. Outpatients who met the American College of Rheumatology 1990 criteria for fibromyalgia and whose Brief Pain Inventory (BPI) average pain score was ≥4 were randomized to duloxetine 60 mg or placebo once daily for 14 weeks. The primary efficacy measure was the change in the BPI average pain score from baseline. Secondary efficacy, quality of life (QoL), and safety outcomes were also evaluated. Mixed-effects model repeated-measures (MMRM) analysis and last observation carried forward (LOCF) analysis of covariance were used to evaluate the primary efficacy measure.ResultsOverall, 393 patients were randomized to receive either duloxetine (n = 196) or placebo (n = 197). The MMRM analysis revealed no significant difference between duloxetine and placebo regarding the change in BPI average pain scores at week 14. Based on LOCF analysis, a statistically significant improvement in the change in BPI average pain scores at week 14 was observed for patients treated with duloxetine compared with placebo. Duloxetine treatment was associated with improved outcomes in nearly all secondary and post hoc analyses. The treatment was generally well tolerated. Somnolence, nausea, and constipation were the most common treatment-emergent adverse events in the duloxetine group. The discontinuation rates due to treatment-emergent adverse events were similar in both groups.ConclusionsAlthough the MMRM analysis did not demonstrate superiority of duloxetine over placebo, duloxetine treatment was associated with improved outcomes in secondary and post hoc analyses of the mean change in the BPI average pain score and most of the secondary outcomes, including analgesia and QoL. Duloxetine treatment was safe and well tolerated. These results suggest that duloxetine treatment could be associated with improvements in pain relief and QoL in Japanese patients with fibromyalgia.Trial registrationClinicalTrials.gov Identifier: NCT01552057 . Registered 9 March 2012.

Project description:BackgroundMonoclonal antibodies targeting the calcitonin gene-related peptide (CGRP) pathway, including the fully humanized monoclonal antibody (IgG2Δa) fremanezumab, have demonstrated safety and efficacy for migraine prevention. Clinical trials include responders and nonresponders; efficacy outcomes describe mean values across both groups and thus provide little insight into the clinical benefit in responders. Clinicians and their patients want to understand the extent of clinical improvement in patients who respond. This post hoc analysis of fremanezumab treatment attempts to answer this question: what is the benefit in subjects who responded to treatment during the two, phase 3 HALO clinical trials?MethodsWe included subjects with episodic migraine (EM) or chronic migraine (CM) who received fremanezumab quarterly (675 mg/placebo/placebo) or monthly (EM: 225 mg/225 mg/225 mg; CM: 675 mg/225 mg/225 mg) during the 12-week randomized, double-blind, placebo-controlled HALO EM and HALO CM clinical trials. EM and CM responders were defined as participants with a reduction of ≥ 2 or ≥ 4 monthly migraine days, respectively. Treatment benefits evaluated included reductions in monthly migraine days, acute headache medication use, and headache-related disability, and changes in health-related quality of life (HRQoL).ResultsOverall, 857 participants from the HALO trials were identified as responders (EM: 429 [73.8%]; CM: 428 [56.7%]). Reductions in the monthly average number of migraine days were greater among EM (quarterly: 5.4 days; monthly: 5.5 days) and CM (quarterly: 8.7 days; monthly: 9.1 days) responders compared with the overall population. The proportion of participants achieving ≥ 50% reduction in the average monthly number of migraine days was also greater in responders (EM: quarterly, 59.8%; monthly, 63.7%; CM: quarterly, 52.8%; monthly, 59.0%) than in the overall population. Greater reductions in the average number of days of acute headache medication use, greater reductions in headache-related disability scores, and larger improvements in HRQoL were observed among EM and CM responders compared with the overall populations.ConclusionsFremanezumab responders achieved clinically meaningful improvements in all outcomes. The magnitude of improvements with fremanezumab across efficacy outcomes was far greater in responders than in the overall trial population, providing insight into expected treatment benefits in participants who respond to fremanezumab in clinical practice.Trial registrationClinicalTrials.gov identifiers: NCT02629861 (HALO EM) and NCT02621931 (HALO CM).

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Duloxetine 60 mg for chronic low back pain: post hoc responder analysis of double-blind, placebo-controlled trials.

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Duloxetine 60 mg for chronic low back pain: post hoc responder analysis of double-blind, placebo-controlled trials.

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