Study to Investigate an Immunomodulatory Therapy in Adult Patients With Perennial Allergic Rhinoconjunctivitis

Inclusion Criteria: * Mild to moderate perennial allergic rhinoconjunctivitis due to hypersensitization towards house dust mite and/or cat allergens Exclusion Criteria: * Clinical relevant other allergies (perennial or seasonal) that could potentially interfere with the patient's study treatment schedule or assessments. * Use of any concomitant medication that could affect the patient's study treatment response or assessment results. * Any clinically relevant concomitant disease as judged by the investigator. * Pregnancy or female planning to become pregnant during the study.