ProBDNF also yielded a good differential efficacy between BM and PD (AUC = 0.808), and BD and PD (AUC = 0.894), PAI-1 and TrkB could distinguish BD and PD (AUC = 0.750 and 0.755, respectively), but not BM and PD. The gene discussed is BDNF; the disease is Behcet disease.