High-dose selenium is known to reduce systemic inflammatory responses through antioxidant and anti-inflammatory effects. Selenium has also been shown in pre-clinical studies to inhibit chemotherapy-induced peripheral neuropathy through reactive oxygen species mechanisms in cells. Therefore, the investigators aimed to confirm the effect of preventing high dose intravenous selenium prior to chemotherapy and to prevent neuropathy caused by chemotherapy. In this study, the investigators will identify the frequency and severity of CIPN according to World Health Organization (WHO) criteria. Also, the investigators will assess the patient's quality of life (QoL), evaluate the effects of the administration of inorganic selenium on CIPN and QoL, and confirm the safety of high-dose selenium. I would like to.
