“…This aim was achieved for the whole range of tumor sizes by using readily available parameters such as the ASA score and patient age. Both parameters, although seemingly not directly related to metastatic potential, have been shown to be useful as both patient age and performance, which is related to comorbidity, have been shown to be predictive factors for survival in RCC disease [16,17,18,19,20,21,22,23]. As our database does not include a performance score for all patients, we used the ASA score as an index of comorbidity.…”