An Evaluation Of PF-03715455 In Moderate To Severe Uncontrolled Asthma

Inclusion Criteria: * Subjects with a physician documented history or diagnosis of persistent asthma (according to GINA, 2014 definition of asthma), * Pre bronchodilator FEV1 of greater than or equal to 50 and less that 80% of predicted. * Subjects defined as GINA Step 4 on a stable dose of either fluticasone/salmeterol combination therapy, or budesonide/formoterol combination therapy or mometasone/formoterol combination therapy. * Subjects who are defined as uncontrolled as evidenced by; Juniper Asthma Control Questionnaire (5 item version, ACQ) score greater than or equal to 1.5 and less than or equal to 3.0) Exclusion Criteria: * Subjects diagnosed with chronic pulmonary disease (COPD) and/or other chronic pulmonary diseases (eg, Occupational asthma, pulmonary fibrosis, bronchiectasis, Allergic bronchopulmonary aspergillosis (ABPA), pneumoconiosis, sarcoidosis, tuberculosis). * Subjects who are current smokers.