Prognostic importance of comorbidity in a hospital-based cancer registry.

By J. Piccirillo, R. Tierney, Irene Costas, L. Grove, Edward L. Spitznagel. Journal of the American Medical Association (JAMA), 2004

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Adverse effects of androgen deprivation therapy and strategies to mitigate them. (2015, methodology): “Evidence for this hypothesis comes from a stratified reanalysis of the Dana-Farber randomized trial in which men with minimal or no comorbidity by the Adult Comorbidity Evaluation-27 index [63] had a highly significant survival benefit with ADT, but men with moderate to severe baseline comorbidity (”