Example of modeling survival with registry data to assist with clinical decision making

Cassie Trewin-Nybråten
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Cassie Trewin-Nybråten: Cancer Registry of Norway–Norwegian Institute of Public Health

Northern European Stata Conference 2024 from Stata Users Group

Abstract: The Cancer Registry of Norway contains several clinical registries with rich information on the diagnosis, treatment, and follow up of cancer patients. Since 2013, the Clinical Registry for Gynecological Cancer has collected information on residual disease (RD) diameter following ovarian cancer surgery, which is prognostic for survival. Internationally, attaining 1cm or less RD is considered “adequate” debulking. This cutoff has been widely used for making treatment decisions and is used to define high-risk patients in Norwegian treatment guidelines. However, few studies have evaluated ovarian cancer survival across continuous RD diameter. In flexible parametric models, I compared excess mortality of stage III–IV ovarian cancer patients across continuous RD diameter using restricted cubic splines. This presentation is an

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