Medical staff's sense of awareness of informed consent for adolescent cancer patients and the need for decision-making support practiced from the perspective of trauma-informed approach.

"Declarations Ethics and Consent to ParticipateThe survey was approved by the Ethics Committee of the National Center for Child Health and Development (2019-084). The subject’s participation in this study was consented to by signing a document. All methods were performed in accordance with Ethical Guidelines for Medical and Health Research Involving Human Subjects established by the Ministry of Health, Labour and Welfare.　Informed consent was obtained from all individual participants included in the study. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This research was made possible by a grant from 2019 Ministry of Health, Labor and Welfare Science Research Grants for Comprehensive Cancer Control Research Project (Principal Investigator: Keizo Horibe). It had no role in the design and conduct of the study."