Study on Pharmacodynamic Parameter and Tolerability With Subcutaneous Immunotherapy in Grass Pollen Allergic Patients

Inclusion Criteria: * A clinical history of grass pollen induced allergic rhinoconjunctivitis of two years or more requiring treatment during the grass pollen season * Lack of adequate relief with symptomatic medication during the previous grass pollen season * Positive Skin Prick Test (SPT) response to Phleum pratense (wheal diameter \>= 3mm) currently performed or not older than 60 days before screening Exclusion Criteria: * FEV1 \< 70% of predicted value at screening * Bronchial asthma corresponding to GINA step 3 or more, even if controlled * History of asthma exacerbation or emergency visit or admission for asthma in the previous 12 months * Previous treatment by immunotherapy with grass pollen allergen or any other allergen within the previous 5 years * Exclusion criteria in accordance with contraindications in the SPC of ALK-Flex SQ