SFTPD and acute kidney injury: The SP-D polymorphisms rs721917CC genotype was 30% in our study cohort, which is similar to that (35%) of a healthy Japanese population and higher than that (24%) of a healthy German population in the study by Horimasu et al. We also found that septic patients with AKI had a significantly higher rate of rs721917CC genotype vs. non-AKI patients.