A Study to Assess the Safety and Tolerability of Multiple Doses of Multi-Level of a Drug in Subjects With Moderate Asthma

Inclusion Criteria:

• Males or infertile females
• Subjects with asthma, well controlled on inhaled corticosteroid and PRN short acting B2 agonist therapy only
• Unchanged dose of inhaled corticosteroid for three months prior to day 0 and no expected need for change in dose during study
• FEV1 greater than or equal to 80% predicted at screening (baseline)
• 18-60 years
• GP diagnosis of asthma of 1 year's min. duration (with respect to Day 0)
• No significant abnormality on clinical examination or medical history (excluding atopic skin signs, symptoms and history)
• 12-lead electrocardiogram with no clinical significant abnormality
• Clinical chemistry hematology and urinalysis results within the laboratory reference ranges or deemed not clinically significant by the Investigator
• A negative screen for drugs of abuse and alcohol
• Body weight between 50-120kg
• Subjects aged between 18-40 years inclusive must have BMI 18-32kg/m2 inclusive. Subjects aged between 41-60 years must have BMI between 18-30 kg/m2, inclusive.

Exclusion Criteria:

• Active concomitant disease, with exception of eczema
• Expected onset of seasonal allergy before the administration of the last dose of study medication
• History of severe exacerbation within 3 years of Day 0

• Recorded use of inhaled short acting B2 agonist medication for symptoms within 14 days of Day 0 of:

  • More than 6 doses per day on any one day or
  • More than 3 doses per day on 6 or more days

• Any medication other than:

  • inhaled short-acting B2 agonist
  • inhaled corticosteroids
  • topic eczema treatments (with the exception of fluorinated corticosteroid dermatological preparations which are not permitted
  • hormone replacement therapy
  • vitamin preparation/food supplements
  • occasional use of proton pump inhibitors, ranitidine, cimetidine, antacids or over-the-counter analgesics.
• Treatment within 6 months of Day 0 with any of the following: methylxanthines, inhaled cromones, leukotriene modifiers, anti- IgE, anticholinergics, ketotifen, oral short acting B2 agonists, long-acting B2 agonists, oral or injected corticosteroids
• Treatment of atopic symptoms, other than eczema, within 4 weeks of Day 0
• History of medication that might carry-over effects into the study
• Previously received monoclonal antibody, or a similar related protein, that might sensitise to CAT-354
• Participation in another study within three months of the start of the study or 5 half lives of the previously administered investigational medicinal product (IMMP), whichever is longer
• Lower respiratory tract infection within four weeks of Day-14
• Any acute illness in the two weeks before Day 0
• Current smokers, those who have smoked in previous year, and those with smoking history of greater than or equal to 10 pack years
• Considered by the investigator to be at risk of transmitting, through blood, the agents responsible for infectious diseases
• Blood donation (550mls) in the previous 2 months
• Excessive intake of alcohol (more than 21 units a week for females or 28 units a week for males)
• The subject's general practitioner has suggested a reason the subject should not participate in the study
• The Investigator considers the subject should not take part for any reason