Background: Borderline personality disorder (BPD) is a chronic and debilitating syndrome associated with considerable morbidity, mortality, and high rates of medical and psychiatric utilization services. The prevalence of BPD is around 1%-2% in general population. However, suicidality and self-injury are common, an estimated 69-80% of patients with BPD attempt suicide and a higher percentage engage in nonsuicidal self-injurious behavior. The rate of completed suicide in this group is appropriately 10%. Several Western literature have demonstrated the therapeutic effects of dialectical behavior therapy (DBT) in patients with BPD. However, research focusing on finding a biological observable marker for the purpose of monitoring treatment effects has started to draw attention. Recent research has implicated that brain-derived neutrophilic factor (BDNF) might be a natural candidate for a biological correlate of early life stress. The alterations in levels of BDNF or BDNF methylation in BPD patients compared to general population, or pre- and post- psychotherapeutic treatment might indicate the consequence of epigenetic modification associated with stressful experience or suicide, and may later be able to explain the psychopathology or neurodevelopment of BPD.