Tobramycin Inhalation Powder (TIP) Improved Lung Function In Cystic Fibrosis (CF) Patients With Respiratory Pseudomonas Aeruginosa (Pa) InfectionMain Category: Cystic Fibrosis
Also Included In: Respiratory / Asthma; Infectious Diseases / Bacteria / Viruses
Article Date: 20 May 2009 - 6:00 PDT
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In a Phase III study, TIP, an inhaled investigational formulation of tobramycin, improved lung function (as measured by FEV1) in cystic fibrosis patients withPseudomonas aeruginosa (Pa) infection, compared to placebo. The data, presented today at the American Thoracic Society (ATS) 2009 International Conference in San Diego, also demonstrated, with respect to secondary endpoints, that TIP decreased sputum Pa density, hospitalization and other antibiotic use in these patients versus placebo.
TIP is currently in Phase III development for the management of CF patients with Pa infection. TIP, a dry-powder form of tobramycin, is delivered in approximately 4 to 6 minutes via a hand-held, portable, pocket-sized inhaler device, twice daily.
More than half of the people with CF have Pa infection, a respiratory condition caused by the Pa bacteria that settle into the thick mucus trapped in the airways. Pa is the most common cause of infection and lung damage in patients with CF.
"The daily treatment routine for patients with CF can take hours. The study findings presented at ATS are promising, as a new treatment option like TIP may allow people with CF an alternative for Pa management," said lead investigator Michael Konstan, MD, Professor and Director, The LeRoy W. Matthews Cystic Fibrosis Center, Rainbow Babies and Children's Hospital and Case Western Reserve University School of Medicine.
In a Phase III placebo-controlled study, patients with CF were administered treatment with TIP 112mg twice daily or matching placebo in a 1:1 ratio during Cycle 1 (28 days on and 28 days off treatment). This was followed by 2 cycles where all patients received TIP1c. The primary efficacy variable was relative change in forced expiratory volume in one second (FEV1) percent predicted from Day 1 to Day 28 (Cycle 1).
At 28 days, patients on TIP showed a significant improvement in FEV1 % predicted with an average improvement of 13% versus placebo (p=.0016). At the end of the first full cycle (Day 56), improvement over placebo in predicted lung function was maintained.
With respect to secondary endpoints, TIP reduced the mean sputum Pa density by 2.59 log10 colony forming units (CFU/mL), compared with 0.24 log10 for placebo. The proportion of patients requiring other antipseudomonal antibiotics was lower with TIP versus placebo (19.6% vs. 32.7%) and the mean duration of additional antipseudomonal antibiotic use was shorter (17 vs. 31.1 days, respectively) over the 56 days of Cycle 1. There were no respiratory-related hospitalizations for patients on TIP compared with 12.2% for patients receiving placebo (average duration of 12.3 days).
Adverse events were reported by 75.5% of placebo-treated and 50% of TIP-treated patients. The most commonly reported adverse events with placebo were cough, lung disorders and productive cough. With TIP, the most common adverse events were cough, lung disorders and sore throat. There were no major changes from baseline in vital signs, hematology, blood chemistry or urine protein. Audiology tests at selected sites indicated that there were no clinically meaningful decreases in hearing thresholds. None of the patients reported adverse events related to hearing.
"Novartis is working closely with respiratory researchers worldwide to develop medications to treat complex respiratory diseases with limited treatment options, including cystic fibrosis," said Robert K. Zeldin, MD, VP and US Medical Franchise Head of Respiratory and Dermatology, Novartis Pharmaceuticals Corporation. "We are pleased to report the findings of the TIP Phase III study, and we look forward to additional clinical data as we work towards regulatory filing."
Novartis Pharmaceuticals Corporation