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Antimicrob Agents Chemother ; 56(4): 2037-47, 2012 Apr.
Article in English | MEDLINE | ID: mdl-22290969

ABSTRACT

Community-acquired pneumonia (CAP) continues to be a major health challenge in the United States and globally. Factors such as overprescribing of antibiotics and noncompliance with dosing regimens have added to the growing antibacterial resistance problem. In addition, several agents available for the treatment of CAP have been associated with serious side effects. Cethromycin is a new ketolide antibiotic that may provide prescribing physicians with an additional agent to supplement a continually limited armamentarium. Two global phase III noninferiority studies (CL05-001 and CL06-001) to evaluate cethromycin safety and efficacy were designed and conducted in patients with mild to moderate CAP. Study CL05-001 demonstrated an 83.1% clinical cure rate in the cethromycin group compared with 81.1% in the clarithromycin group (95% confidence interval [CI], -4.8%, +8.9%) in the intent to treat (ITT) population and a 94.0% cethromycin clinical cure rate compared with a 93.8% clarithromycin cure rate (95% CI, -4.5%, +5.1%) in the per protocol clinical (PPc) population. Study CL06-001 achieved an 82.9% cethromycin clinical cure rate in the ITT population compared with an 88.5% clarithromycin cure rate (95% CI, -11.9%, +0.6%), whereas the clinical cure rate in the PPc population was 91.5% in cethromycin group compared with 95.9% in clarithromycin group (95% CI, -9.1%, +0.3%). Both studies met the primary endpoints for clinical cure rate based on predefined, sliding-scale noninferiority design. Therefore, in comparison with clarithromycin, these two noninferiority studies demonstrated the efficacy and safety of cethromycin, with encouraging findings of efficacy in subjects with Streptococcus pneumoniae bacteremia. No clinically significant adverse events were observed during the studies. Cethromycin may be a potential oral therapy for the outpatient treatment of CAP.


Subject(s)
Anti-Bacterial Agents/therapeutic use , Clarithromycin/therapeutic use , Community-Acquired Infections/drug therapy , Ketolides/therapeutic use , Pneumonia/drug therapy , Adolescent , Adult , Aged , Anti-Bacterial Agents/adverse effects , Clarithromycin/adverse effects , Community-Acquired Infections/epidemiology , Community-Acquired Infections/microbiology , Double-Blind Method , Endpoint Determination , Ethnicity , Female , Humans , Ketolides/adverse effects , Male , Middle Aged , Pneumonia/epidemiology , Pneumonia/microbiology , Sex Factors , Treatment Outcome , Young Adult
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