Efficacy and safety of S-ketamine in pain management for breast cancer patients undergoing modified radical mastectomy: a meta-analysis of randomized controlled trials.

Background: Breast cancer remains a leading cause of morbidity and mortality among women worldwide. According to the recent statistics by World Health Organization (WHO), it is the leading cause of death from cancer in women worldwide and it is the most frequently diagnosed cancer. This meta-analysis aims to systematically evaluate the efficacy and safety of S-ketamine in patients undergoing modified radical mastectomy.