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BackgroundSmoking is a major risk factor for COPD and may impact the efficacy of COPD treatments; however, a large proportion of COPD patients continue to smoke following diagnosis.MethodsThis post-hoc analysis of pooled data from the replicate 12-week, placebo-controlled GEM1 and GEM2 studies assessed the impact of smoking status on the efficacy and safety of glycopyrrolate 15.6 μg twice daily vs placebo in patients with moderate-to-severe COPD. Data from 867 patients enrolled in GEM1 and GEM2 were pooled for analysis and grouped by smoking status (57% current smokers, 43% ex-smokers). Forced expiratory volume in 1 s (FEV1) area under the curve from 0 to 12 h, trough FEV1, forced vital capacity, St George's Respiratory Questionnaire (SGRQ) total score, COPD assessment test (CAT) score, transition dyspnea index (TDI) focal score, daily symptom scores, and rescue medication use were assessed in current smokers and ex-smokers. Incidences of adverse events (AEs) and serious AEs (SAEs) were also assessed.ResultsTreatment with glycopyrrolate resulted in significant improvements in all lung function measures, independent of smoking status. In both current and ex-smokers, changes from baseline in trough FEV1 were less marked in patients taking inhaled corticosteroids (ICS) than those not receiving ICS. Changes from baseline in SGRQ total score and rescue medication use were significantly greater with glycopyrrolate compared with placebo, regardless of smoking status. Changes in the CAT score, TDI focal score, and daily symptom scores significantly improved versus placebo, but only in current smokers. Improvements in patient-reported outcomes (PROs) with glycopyrrolate relative to placebo were numerically greater in current smokers than ex-smokers. The incidences of AEs and SAEs were similar regardless of smoking status.ConclusionsIn this post-hoc analysis of GEM1 and GEM2, glycopyrrolate use led to significant improvements in lung function, independent of baseline smoking status; improvements were less marked among patients receiving background ICS, regardless of baseline smoking status. Improvements in PROs were greater with glycopyrrolate than placebo, and the magnitude of changes was numerically greater among current smokers. The safety profile of glycopyrrolate was comparable between current smokers and ex-smokers.

Much information is available about the construction and evaluation of the prediction variance properties of response surface designs for fitting a second-order model in a spherical region of interest. There is less information available about the prediction variance properties of second-order designs for a cuboidal region. In this paper, we construct and evaluate designs that are appropriate for the second-order model in cuboidal regions of interest. Several standard experimental designs are investigated and some new designs created using the G and I optimality criteria. We evaluate the designs using the variance of the predicted response over the design region. Variance dispersion graphs and fraction of design space plots are utilized to characterize the scaled prediction variance properties of the most promising designs. [ABSTRACT FROM AUTHOR]

Purpose: Bronchodilator reversibility has been reported in patients with COPD, although correlations between reversibility and treatment response are unclear. The effect of reversibility on lung function, health status, and dyspnea was assessed in patients with moderate-to-severe COPD receiving glycopyrrolate (GLY) 15.6 µg twice daily vs placebo in the Glycopyrrolate Effect on syMptoms and lung function 1 and 2 (GEM1 and GEM2) replicate, 12-week, placebo-controlled studies., Patients and Methods: Reversibility was defined as a post-bronchodilator increase of ≥12% and ≥0.200 L in FEV 1 . FEV 1 area under the curve from 0 to 12 hours (AUC0-12 h), trough FEV 1 , St George's Respiratory Questionnaire (SGRQ) total score, COPD Assessment Test (CAT™) score, Transition Dyspnea Index (TDI) focal score, daily symptom scores, and rescue medication use were assessed by reversibility status. Incidences of adverse events and serious adverse events were also assessed., Results: Data from 846 patients enrolled in GEM1 and GEM2 with known reversibility status were pooled for post hoc analysis. GLY significantly improved FEV 1 AUC0-12 h, trough FEV 1 , SGRQ and CAT total scores, and rescue medication use compared with placebo in reversible and nonreversible patients. Significant improvements in TDI focal score and daily symptom scores with GLY over placebo were observed only among reversible patients. Improvements in FEV 1 AUC0-12 h (0.165 vs 0.078 L; P <0.001) and trough FEV 1 (0.173 vs 0.070 L; P <0.001) were clinically relevant (based on minimal clinically important differences) and significantly greater in reversible compared with nonreversible patients receiving GLY. The safety profile of GLY was not affected by reversibility status., Conclusion: In this post hoc analysis, GLY was associated with significant improvements in lung function and patient-reported outcomes compared with placebo, mostly independent of reversibility status. In patients receiving GLY, improvements in lung function were greater in reversible compared with nonreversible patients. Reversibility status did not meaningfully impact the safety profile of GLY., Competing Interests: Disclosure JAO has served on advisory boards for Sunovion Pharmaceuticals Inc., AstraZeneca, Boehringer Ingelheim, GlaxoSmithKline, Novartis, Mylan, and Theravance, and has provided expert witness testimony for Wallace & Graham; Levy Konigsberg; Goldenberg Heller & Antognoli; Simon Greenstone Panatier Bartlett; Williams Kherkher Hart; Gori Julian & Associates; Simmons Hanly Conroy; and Elrod Pope. AB, TG, BP, AO-G, SSh, and SSa are employees of Sunovion Pharmaceuticals Inc. The authors report no other conflicts of interest in this work.