SFTPA2 and allergic bronchopulmonary aspergillosis: Saxena et al [28] reported that ABPA patients with polymorphisms (ala91pro, arg94arg) in the collagen region of pulmonary surfactant protein A2 (SP-A2) had more elevated total IgE levels and higher percentages of eosinophilia than those observed in patients who lacked the SNPs.