title: Formoterol as reliever medication in asthma: a post-hoc analysis of the subgroup of the RELIEF study in East Asia.
abstract: BACKGROUND
  As-needed formoterol can effectively relieve asthma symptoms. Since budesonide/formoterol is available as maintenance and reliever therapy in Asia, formoterol is now being used as-needed, but always with concomitant inhaled corticosteroids. The objective of this analysis was to assess the safety and efficacy of formoterol therapy in patients in East Asia (China, Indonesia, Korea, the Philippines and Singapore) with asthma.
  
  
  METHODS
  Post-hoc analyses of data from the East Asian population of the RELIEF (REal LIfe EFfectiveness of Oxis® Turbuhaler® as-needed in asthmatic patients; study identification code: SD-037-0699) study were performed.
  
  
  RESULTS
  This sub-group comprised 2834 randomised patients (formoterol n = 1418; salbutamol n = 1416) with mean age 35 years; 50.7% were male. 2678 patients completed the study. There was no significant difference in the total number of adverse events (AEs) reported in the formoterol and salbutamol groups (21.3% vs 20.9% of patients; p = 0.813), nor in the total number of serious AEs and/or discontinuations due to AEs (4.6% vs 5.5%, respectively; p = 0.323). Compared with salbutamol, formoterol was associated with a significantly longer time to first exacerbation (hazard ratio 0.86; p = 0.023) and a 14% reduction in the risk of any exacerbation (p < 0.05). Relative to salbutamol, mean adjusted reliever medication use throughout the study was significantly lower in the formoterol group (p = 0.017) and the risk of increased asthma medication use was 20% lower with formoterol (p = 0.005).
  
  
  CONCLUSIONS
  Among patients with asthma in East Asia, as-needed formoterol and salbutamol had similar safety profiles but, compared with salbutamol, formoterol reduced the risk of exacerbations, increased the time to first exacerbation and reduced the need for reliever medication.
authors.affiliation: Department of Pulmonary Disease, Ruijin Hospital, Shanghai Jiao Tong University, No.150 Wu Yi Road, Shanghai, 200025, China. chengqijian@aliyun.com.
authors.forename: Qi Jian
authors.initials: QJ
authors.lastname: Cheng
authors.affiliation: Department of Pulmonary Disease, Ruijin Hospital, Shanghai Jiao Tong University, No.150 Wu Yi Road, Shanghai, 200025, China. huangshaoguang@vip.163.com.
authors.forename: Shao-Guang
authors.initials: SG
authors.lastname: Huang
authors.affiliation: Capital Institute of Pediatrics, Beijing, China. chenyuzhi@gmail.com.
authors.forename: Yu Zhi
authors.initials: YZ
authors.lastname: Chen
authors.affiliation: Department of Respiratory Diseases, China-Japan Friendship Hospital, Beijing, China. jiangtao_l@263.net.
authors.forename: Jiang-Tao
authors.initials: JT
authors.lastname: Lin
authors.affiliation: Department of Respiratory Medicine, Shanghai First People's Hospital, Shanghai Jiao Tong University, Shanghai, China. xzhou53@163.com.
authors.forename: Xin
authors.initials: X
authors.lastname: Zhou
authors.affiliation: Department of Respiratory Disease, Tianjin Medical University General Hospital, Tianjin, China. cbynew@126.com.
authors.forename: Bao-Yuan
authors.initials: BY
authors.lastname: Chen
authors.affiliation: Department of Respiratory Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan, China. fengyulin1115@126.com.
authors.forename: Yu-Lin
authors.initials: YL
authors.lastname: Feng
authors.affiliation: Medical and Regulatory Affairs, AstraZeneca China, Shanghai, 201203, China. Xia.Ling@astrazeneca.com.
authors.forename: Xia
authors.initials: X
authors.lastname: Ling
authors.affiliation: Michael G DeGroote School of Medicine, Faculty of Health Sciences, McMaster University, Hamilton, ON, Canada. searsm@mcmaster.ca.
authors.forename: Malcolm R
authors.initials: MR
authors.lastname: Sears
mesh_terms: D000280:Administration, Inhalation; D000293:Adolescent; D058666:Adrenergic beta-2 Receptor Agonists / Q000627:therapeutic use*; D000328:Adult; D000368:Aged; D000420:Albuterol / Q000627:therapeutic use*; D001249:Asthma / Q000188:drug therapy*; D002648:Child; D002681:China; D005260:Female; D000068759:Formoterol Fumarate / Q000627:therapeutic use*; D006801:Humans; D007214:Indonesia; D008297:Male; D008875:Middle Aged; D010679:Philippines; D016016:Proportional Hazards Models; D056910:Republic of Korea; D012846:Singapore; D016896:Treatment Outcome; D055815:Young Adult
chemical_list: D058666:Adrenergic beta-2 Receptor Agonists; D000420:Albuterol; D000068759:Formoterol Fumarate