TNFSF13B and interstitial lung disease: When patients were divided into RP-ILD and non-RP-ILD groups, the RP-ILD patients had the significantly higher BAFF levels as compared to non-RP-ILD patients (4549.78 ± 1839.97 vs. 3297.28 ± 1794.69 pg/mL, p = 0.04) (Fig. 1 and Table 2).