A variant of the SP-A1gene (6A6) was identified as a risk factor for BPD in a German population, and two single-nucleotide polymorphisms (SNPs) in the SP-A2 and SP-D genes (1A2-rs2243639; 1A2-rs721917-rs2243639) were found as protective factors for BPD in a Greek population (59). Here, SFTPA2 is linked to bronchopulmonary dysplasia.