Effect Of Long-Term Peripheral Neuropathy Induced On Cisplatin-Based Chemotherapy Or Radiation To The Retroperitoneum In Testicular Germ Cell Tumor Survivors.

e17062 Background: Treatment for testicular germ cell tumors (GCTs) results in late chemotherapy-induced peripheral neuropathy (CIPN). This study aimed to evaluate impact of curative treatments on different subtypes of self-reported peripheral nerve damage. Methods: GCT survivors (N = 186) followed-up annually at National Cancer Institute in Slovakia have prospectively completed European Organisation for Research and Treatment of Cancer (EORTC) CIPN20 questionnaire at 10 years of median follow-up (range 4-25). EORTC CIPN20 scoring allowed to obtain subscales on sensory function, motor function and autonomy function as well as an overall score. Study groups consisted of survivors treated with chemotherapy (N = 141) and radiotherapy to the retroperitoneum (N = 15). The control group consisted of survivors cured with orchiectomy alone (N = 30) Results: GCT survivors cured with chemotherapy reported higher impairment in overall peripheral neurological function compared to controls (mean score ± SEM: 24.2 ± 0.5 vs. 22.3 ± 1.1, P = 0.03). CIPN20 subscales have shown greater impairment in motor function (P = 0.04), but not in sensory/autonomy functions (both P > 0.05) in chemotherapy group versus controls. Survivors treated with BEPx3 or EPx4 reported similar CIPN in all subscales (all P > 0.05). Motor function was worse in survivors who received ³400mg/m2 of cisplatin compared to ones who received < 400mg/m2 (mean score ± SEM: 9.5 ± 0.2 vs. 8.9 ± 0.3, P = 0.04). Interestingly, patients treated with radiotherapy to the retroperitoneum (but not with chemotherapy) suffered from significantly more peripheral neuropathy in all measured domains compared to the controls (all P < 0.02) Conclusions: Evaluation of long-term perceived peripheral neuropathy after treatment for GCT has shown primarily motor function impairment after chemotherapy. Moreover, significant peripheral neuropathy in all observed CIPN20 subscales after radiotherapy to the retroperitoneum suggests this symptom is not exclusive to cisplatin-based chemotherapy.