Measurement of Oxidative Stress Index in 102 Patients with Peyronie's Disease.

: (PD) is a chronic inflammatory condition that affects the penile albuginea. Oxidative stress (OS) plays a crucial role in the development of the disease, prompting us to investigate OS levels at the site of the disease and in peripheral blood. This article presents our second study in which the OS was evaluated by calculating the OS index (OSI) in blood samples taken directly from the penile corpora cavernosa of patients with PD. Our innovative diagnostic method, which focuses on the analysis of oxidative stress (OS) in the corpora cavernosa of the penis, allows us to accurately identify the "chemical" signals (OS levels) of the pathology in the area where it is present. : Our study included 102 PD patients from our Peyronie's care center and 100 control cases. To conduct a comprehensive OS analysis, we measured both the total oxidant status (TOS) and total antioxidant status (TAS) and calculated the oxidative stress index (OSI) as OSI = TOS/TAS × 100. Blood samples were collected from the penis and a vein in the upper extremity, and OS was measured using d-ROMs and PATs (FRAS kit). : Pearson's analyses revealed a significant statistical correlation between penile OSI values and PD plaque volumes ( = 0.003), while no correlation was found between systemic OSI values and plaque volumes ( = 0.356). Penile OSI values decreased significantly after PD plaque removal ( < 0.0001). A comparison of penile OSI values in PD patients (post plaque removal) and the control group showed no significant differences ( = 0.418). : The lack of correlation between systemic OSI values and Peyronie's plaque volume suggests that direct sampling from the site of the disease is preferable for OS studies. Conducting a penile OSI study could provide a precise oxidative marker dependent on plaque volume. In addition, the penile OSI study can biochemically monitor the therapeutic result, alongside penile ultrasound imaging.