Both the BOS group (0.27 ± 0.216 g/L vs. 0.76 ± 0.620 g/L, p = 0.013) and non-BOS group had lower IgA levels after transplantation than before transplantation (0.49 ± 0.367 g/L vs. 1.31 ± 0.751 g/L, p < 0.001). This evidence concerns the gene CD79A and Buschke-Ollendorff syndrome.