A phase 2 study of aztreonam lysine for inhalation to treat patients with cystic fibrosis and Pseudomonas aeruginosa infection.
BACKGROUND
Aztreonam lysine for inhalation (AZLI) is being developed for treatment of CF patients with Pseudomonas aeruginosa airway infection.


METHODS
This double-blind, randomized, placebo-controlled Phase 2 study evaluated the safety, tolerability and efficacy of 75 and 225 mg AZLI administered BID for 14 days using the eFlow Electronic Nebulizer (Pari Innovative Manufacturers, Inc., Midlothian, VA). Patients were 13 years and older with FEV1>or=40% predicted, chronic P. aeruginosa infection, and had used no anti-pseudomonal antibiotics for 56 days.


RESULTS
Of 131 patients screened, 105 received AZLI or placebo. Mean age was 26 years and mean FEV1 percent predicted was 77% at baseline. There was a statistically significant reduction, compared to placebo, in P. aeruginosa CFU density in each AZLI group at Days 7 and 14 (P<0.001). The planned primary analysis, percent change in FEV1 at Day 14, demonstrated no statistically significant difference. Post hoc analysis demonstrated significant increase in FEV1 at Day 7 for the subset of patients with baseline FEV1<75% predicted in the 225 mg AZLI group. Bronchodilator use was associated with greater improvement in FEV1, as well as greater reduction in P. aeruginosa bacterial density and higher plasma aztreonam concentrations in the 225 mg AZLI group. Adverse events were similar between placebo and AZLI although there was a trend toward increased respiratory symptoms in the 225 mg AZLI group.


CONCLUSIONS
These data support the further development of AZLI and provide information for the design of subsequent studies.
Retsch-Bogart
George Z
GZ
Department of Pediatrics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-7220, USA. gzrb@med.unc.edu
Burns
Jane L
JL
Otto
Kelly L
KL
Liou
Theodore G
TG
McCoy
Karen
K
Oermann
Christopher
C
Gibson
Ronald L
RL
D000280:Administration, Inhalation; D000293:Adolescent; D000328:Adult; D000900:Anti-Bacterial Agents / Q000008:administration & dosage / Q000627:therapeutic use*; D001398:Aztreonam / Q000008:administration & dosage / Q000627:therapeutic use*; D003550:Cystic Fibrosis / Q000150:complications* / Q000188:drug therapy*; D004311:Double-Blind Method; D005260:Female; D005540:Forced Expiratory Flow Rates; D006801:Humans; D008297:Male; D009330:Nebulizers and Vaporizers; D011552:Pseudomonas Infections / Q000150:complications* / Q000188:drug therapy*; D013997:Time Factors; D016896:Treatment Outcome
D000900:Anti-Bacterial Agents; D001398:Aztreonam