Recently, there has been increasing appreciation of chronic obstructive pulmonary disease (COPD) as an important risk factor of invasive pulmoanry aspergillosis (IPA). However, clinical data on the morbidity and mortality of IPA underlying COPD as well as the efficacy and safety of antifungal treatment in such subset of patient population is very limited. In clinical pratice, capofungin is often used as primary antifungal therapy for IPA, especially in patients with impaired renal function. Based on this data, the investigators propose to study the efficacy and safety of three-week antifungal therapy with caspofungin in hospitalized patients with proven or probable IPA underlying COPD.