Prognostic significance of surgery and radiotherapy in elderly patients with localized prostate cancer: establishing and time-based external validation a nomogram from SEER-based study.

"Declarations Ethics approval and consent to participateThe data of this study is obtained from the SEER database. The patients’ data is public and anonymous, so this study does not require ethical approval and informed consent. Consent for publicationNone. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This study was supported by Yunnan Education Department of Science Research Fund (No. 2020 J0228, 2023 J0295), Kunming City Health Science and Technology Talent “1000” training Project (No. 2020- SW (R)-112), Kunming Health and Health Commission Health Research Project (No. 2020–0201-001), Open Research Fund of Clinical Research Center for Children’s Health and Diseases of Yunnan Province (No.2022-ETYY-YJ-03), Department of Science and Technology of Yunnan Province Kunming Medicine Joint Special Program-General Program (No. 202001AY070001-271, 202301AY070001-108), and Kunming Health Personnel Training Project Technology Center Construction Project (No. 2020-SW (T) -15). The funding bodies played no role in the study’s design and collection, analysis and interpretation of data, and writing the manuscript."