Hayama Y, Inoue T. The effects of deep breathing on 'tension-anxiety' and fatigue in cancer patients undergoing adjuvant chemotherapy. Complement Ther Clin Pract. 2012;18(2):94-98. doi:10.1016/j.ctcp.2011.10.001
This RCT found that a 4-step deep breathing practice relieved 'tension-anxiety' and fatigue among Japanese women with gynecological cancer undergoing adjuvant chemotherapy.