In the analysis stratified by tumor type, elevated levels of SAA were significantly correlated with poor OS in urinary cancers (HR = 2.31, 95% CI 1.54–3.48), digestive system cancers (HR = 3.97, 95% CI 1.98–7.94) and other cancers (HR = 1.70, 95% CI 1.34–2.16). The gene discussed is SAA1; the disease is digestive system cancer.